Answer:
The moon doesn’t have light of its own, the moon lights up because of the sun. So at night, as the light of the sun doesn't reach the grass directly because of the moon, it doesnt reflect any color off the grass, and so our eyes detect grass as black.
Explanation:
Sun appears white, but it is made up of the colors: red, orange, yellow, green, blue, indigo, and violet. When white light hits an object, it absorbs some colors and reflect the others. Grass appears green because it absorbs all the wavelengths except green. Green is reflected off the grass, so we see grass as green.
A mixture of three hydrocarbons is at equilibrium at 100°C and 15 atmospheres. The can be assumed to form an ideal mixture in both the liquid and vapor phases. The composition of the mixture and the constants for the vapor pressure functions for each component are given below. The vapor pressure functions are of the form
ln P = A ? D/T
where P is in atmospheres and T is in Kelvins.
Component z A D
C3 0.25 9.816 2260
C4 0.40 9.922 2696
C5 0.35 10.173 3141
a) Determine whether the mixture is a subcooled liquid, a mixture of vapor and liquid, or a superheated vapor.
b) It is desired to bring the mixture to its bubble point (saturated liquid). If temperature is maintained at 100°C, to what total pressure must the mixture be subjected to reach the bubble point?
c) If pressure is maintained at 15 atmospheres, to what temperature must the mixture be adjusted to reach the bubble point? An answer within a few degrees centigrade is acceptable.
a) The mixture is a superheated vapor pressure.
b) The mixture must be subjected to a total pressure of 14.00 atmospheres to reach the bubble point.
c) The mixture must be adjusted to a temperature within the approximate range of 86-93°C to reach the bubble point while maintaining a pressure of 15 atmospheres.
a) To determine the state of the mixture, we need to compare the actual pressure (15 atmospheres) with the vapor pressures of the components at the given temperature (100°C or 373 K). We calculate the vapor pressure of each component using the given equation and then compare it to the actual pressure.
For C3: ln P = 9.816 - (2260 / 373) ≈ 3.285
For C4: ln P = 9.922 - (2696 / 373) ≈ 3.024
For C5: ln P = 10.173 - (3141 / 373) ≈ 2.246
Since the actual pressure (15 atmospheres) is greater than the vapor pressures of all the components, the mixture is a superheated vapor.
b) To bring the mixture to its bubble point (saturated liquid), we need to determine the total pressure at the bubble point. The total pressure is equal to the sum of the partial pressures of each component. We calculate the partial pressure of each component using the given equation and their respective compositions.
Partial pressure of C3 = 0.25 × 15 atmospheres = 3.75 atmospheres
Partial pressure of C4 = 0.40 × 15 atmospheres = 6.00 atmospheres
Partial pressure of C5 = 0.35 × 15 atmospheres = 5.25 atmospheres
Therefore, to reach the bubble point, the mixture must be subjected to a total pressure of 3.75 + 6.00 + 5.25 = 14.00 atmospheres.
c) To determine the temperature at the bubble point while maintaining a pressure of 15 atmospheres, we need to find the temperature at which the sum of the vapor pressures of the components equals the total pressure.
For C3: ln P = 9.816 - (2260 / T)
For C4: ln P = 9.922 - (2696 / T)
For C5: ln P = 10.173 - (3141 / T)
We substitute P = 15 atmospheres into each equation and solve for T. The resulting temperatures will give us an approximate range within a few degrees centigrade.
For C3: T ≈ 359 K (86°C)
For C4: T ≈ 362 K (89°C)
For C5: T ≈ 366 K (93°C)
Therefore, to reach the bubble point while maintaining a pressure of 15 atmospheres, the mixture must be adjusted to a temperature within the approximate range of 86-93°C.
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the terminals of a 0.70 v watch battery are connected by a 80.0-m-long gold wire with a diameter of 0.100 mm .
A gold wire with a length of 80.0 meters and a diameter of 0.100 millimeters connects the terminals of a 0.70 V watch battery. Therefore, 0.28 Amperes of current are flowing via the gold wire.
To determine the current in the wire, we need to use Ohm's Law, which states that the current (I) flowing through a conductor is equal to the voltage (V) across the conductor divided by its resistance (R):
[tex]\begin{equation}I = \frac{V}{R}[/tex]
First, let's calculate the resistance of the gold wire. The resistance (R) can be determined using the formula:
[tex]\begin{equation}R = \frac{\rho L}{A}[/tex]
where ρ is the resistivity of gold, L is the length of the wire, and A is the cross-sectional area of the wire.
The resistivity of gold (ρ) is approximately 2.44 x 10⁻⁸ Ω·m.
The length of the wire (L) is given as 80.0 m.
To find the cross-sectional area (A) of the wire, we need to convert the diameter (0.100 mm) to meters:
Diameter = 0.100 mm = 0.100 x 10⁻³ m
The cross-sectional area (A) can be calculated using the formula:
[tex]\begin{equation}A = \pi \left(\frac{d}{2}\right)^2[/tex]
[tex]\begin{equation}A = \pi \left(\frac{0.100 \times 10^{-3} \text{m}}{2}\right)^2[/tex]
A = 7.854 x 10⁻¹⁰ m²
Next, we can calculate the resistance (R) using the formula:
[tex]R = \frac{\rho L}{A}[/tex]
where ρ is the resistivity of gold, given as 2.44 x 10⁻⁸ Ω·m, and L is the length of the wire, given as 80.0 m.
[tex]R = \frac{2.44 \times 10^{-8} \Omega \cdot m \times 80.0 m}{7.854 \times 10^{-10} m^2}[/tex]
R = 2.50 Ω
Finally, we can determine the current (I) using Ohm's Law:
[tex]I = \frac{V}{R}[/tex]
Given that the voltage (V) across the wire is 0.70 V, we can substitute the values:
[tex]I = \frac{0.70\,V}{2.50\,\Omega}[/tex]
I = 0.28 A
Therefore, the current flowing through the gold wire is 0.28 Amperes.
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Complete question :
The terminals of a 0.70 V watch battery are connected by a 80.0-m-long gold wire with a diameter of 0.100 mm . What is the current in the wire?
If 2 people are on a bed and they are the same weight, and 1 of them gets off and the bed breaks who is responsible? Is it the person still on the bed or the person who got off?
Answer:
I would say the one who got up bc if he or she wouldn't have gotten up the bed wouldn't have broke
1. A pump is being used to transport a liquid food product (rho=1000 kg/m3, μ=1.5 cP) from a holding tank to a filling machine at a mass flow rate of 2 kg/s. The liquid level in the holding tank is 10 m above the pump, and the filling machine is 5 m above the pump. There is 100 m of 2-in nominal diameter sanitary pipeline between the holding tank and the filling machine, with one open globe valve and four regular 90 C flanged elbows in the system. The product is being pumped through a heat exchanger with 100 kPa of pressure drop due to friction before filling. Determine the theoretical power requirement for the pump.
The theoretical power requirement for the pump is 97.39 W.
Given Information: Density of the liquid, ρ = 1000 kg/m³, Viscosity of the liquid, μ = 1.5 cP, The mass flow rate of the liquid, m = 2 kg/s, The height difference between the holding tank and the filling machine, H = 10 - 5 = 5 m, Length of the pipeline, L = 100 m, Diameter of the pipeline, d = 2 inches = 0.05 m, Pressure drop due to friction, ∆P = 100 kPa, Number of globe valves, n₁ = 1, Number of regular flanged elbows, n₂ = 4.
We need to determine the theoretical power requirement for the pump.
Theoretical power requirement is given by;
P = mgh + [(ΔP/ρ) × Q] + [(K₁ + K₂) × ρ × g × Q²/2]
Where, P = Power (W), ρ = Density of the liquid (kg/m³), m = Mass flow rate of the liquid (kg/s), g = Acceleration due to gravity (m/s²), h = Height difference between the two points (m), ΔP = Pressure drop due to friction (Pa), L = Length of the pipeline (m), d = Diameter of the pipeline (m), Q = Volumetric flow rate (m³/s), K₁, K₂ = Loss coefficients of the globe valve and regular flanged elbow respectively.
The formula for the volumetric flow rate is given by;
Q = (π/4) × d² × v
Where, v = Velocity of the fluid.
The formula for velocity is given by
v = (4 × m)/(ρ × π × d²)
Now, putting the given values in the above formulas
P = (2 × 9.81 × 5) + [(100000/1000) × (2/0.05²) ] + [(0.45 + 4 × 0.35) × 1000 × 9.81 × (2/(π × 0.05²) )²/2]P = 97.39 W.
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A two-dimensional vector makes an angle of θ=41.4∘ and has an x-component of 21.5meters. Calculate the magnitude of this twodimensional vector. Please enter a numerical answer below. Accepted formats are numbers or "e" based scientifio notation e9.0.23,−2,1 e.6, 5.23 e-8 Enier answet here 46,65 meters
The magnitude of the two-dimensional vector, with an x-component of 21.5 meters and an angle of θ=41.4°, is approximately 46.65 meters. This is calculated using trigonometry and the Pythagorean theorem.
Determine how to find the magnitude of the vector?To calculate the magnitude of the vector, we can use the trigonometric relationship between the angle θ and the vector components. The x-component of the vector is given as 21.5 meters.
Using trigonometry, we can find the y-component of the vector:
sin(θ) = y-component / magnitude
Rearranging the equation, we have:
y-component = magnitude * sin(θ)
Given θ = 41.4° and the x-component as 21.5 meters, we can substitute these values into the equation and solve for the magnitude:
y-component = magnitude * sin(41.4°)
y-component = magnitude * 0.65605902899
Since the vector lies in the xy-plane, the magnitude can be found using the Pythagorean theorem:
magnitude = sqrt(x-component² + y-component²)
magnitude = sqrt(21.5² + y-component²)
Substituting the value of y-component, we have:
magnitude = sqrt(21.5² + (magnitude * 0.65605902899)²)
Simplifying the equation and solving for the magnitude, we find that the magnitude is approximately 46.65 meters.
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A stalled car is being pushed up a hill at constant velocity by three people. The net force on the car is a. up the hill and equal to the weight of the car.
b. down the hill and equal to the weight of the car. c, Zero up the hill and greater than the weight of the car.
d. down the hill and greater than the weight of the car.
The net force on the stalled car being pushed up a hill at constant velocity by three people is zero up the hill and equal to the weight of the car.
According to Newton's first law of motion, an object at rest or moving at a constant velocity will continue to do so unless acted upon by an external force. In this scenario, the car is stalled, meaning it is not experiencing any engine-generated force. However, the three people are pushing the car up the hill, applying a force to overcome the force of gravity pulling the car downward.
Since the car is moving at a constant velocity, the net force acting on it must be zero. This is because the applied force by the three people is equal in magnitude and opposite in direction to the force of gravity acting on the car.
Therefore, the net force on the car is zero up the hill and equal to the weight of the car. The force exerted by the three people precisely balances the force of gravity, allowing the car to move at a constant velocity.
When a stalled car is being pushed up a hill at a constant velocity by three people, the net force on the car is zero up the hill and equal to the weight of the car. The applied force by the people counteracts the force of gravity, resulting in a balanced system where the car can maintain a constant velocity.
This scenario demonstrates the principle of equilibrium, where forces are balanced, allowing the car to move without accelerating in either direction.
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the planet that has the lowest density is _____ while the planet that is tilted 90° to the orbital plane is _____.
The planet that has the lowest density is Saturn, while the planet that is tilted 90° to the orbital plane is Uranus.
Which planet has the least density, and which one is tilted 90° to its orbital plane?Saturn, the second-largest planet in our solar system, has the lowest average density among all the planets. With its famous rings made up of icy particles and rocky debris, Saturn has an average density of about 0.687 grams per cubic centimeter. This low density is primarily due to its composition, which includes a significant amount of hydrogen and helium, making it less dense than water.
On the other hand, Uranus, the seventh planet from the Sun, holds a peculiar distinction in our solar system. It is tilted approximately 98 degrees, which means its axis is almost perpendicular to the plane of its orbit. This extreme tilt causes Uranus to experience dramatic seasonal variations, where one pole faces the Sun continuously for half of its orbit, while the other pole faces prolonged darkness. This unique axial tilt sets Uranus apart from the other planets, making it the planet tilted 90° to its orbital plane.
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If the angle of incidence is 35 degree, what is the angle of reflection?
Answer:
35
Explanation:
angle of incidence equals angle of reflection
q7: where was the noon altitude of the sun highest and lowest on the equinoxes? your answer should be either a latitude or a name for a specific latitude.
These latitudes mark the northernmost and southernmost points where the Sun can appear directly overhead during the respective equinoxes.
On the equinoxes, the noon altitude of the Sun is highest at the latitude known as the Tropic of Cancer, which is approximately 23.5 degrees north of the equator. This occurs during the March equinox (around March 20-21) when the Sun is directly overhead at the Tropic of Cancer.
Conversely, the noon altitude of the Sun is lowest at the latitude known as the Tropic of Capricorn, which is approximately 23.5 degrees south of the equator. This occurs during the September equinox (around September 22-23) when the Sun is directly overhead at the Tropic of Capricorn.
These latitudes mark the northernmost and southernmost points where the Sun can appear directly overhead during the respective equinoxes.
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Mass of trolley (m):
(1)
0,9
kg
Mass
m xa
Acceleration
(a)
(mos)
Applied
Force (N)
0
4,04
O112
Tabulate your measurements in the table below.
At from A to B (s)
Average
Kg
At (s)
1
2
3
Hanger only
4,07 4,00
HOS
Hanger +
1 mass piece
10
3,09
3,04 3,10
3,14
Hanger +
2 mass pieces
ao
2,00
Hanger +
3 mass pieces 30
1196
1,91
Hanger +
4 mass pieces
168 1,69 1,TO 1,69
(5)
0,21
2,1 x 103 0, 098
O #4
8,8X10
2,22 2,14
0, 196
01 SS
0102
o zau
0103
01392
0/ 70
(5)
(5)
QUESTIONS AND ANALYSIS
1.
In this experiment identify the...
1.1
independent variable
(1)
1.2 dependent variable
3 E
1.3
controlled variable
Ар со
2.
3
Describe how the effect of friction was minimised in the experiment.
(1)
Use the recorded data to plot a graph that will show the relationship
between the acceleration and the applied force on the trolley. Use a (8)
graph paper.
Ilse the cranh to determine the mass of the trolley.
(4)
Answer:
ij
Explanation:
Air containing 0.06% carbon dioxide is pumped into a room whose volume is 300 m3. The air is pumped in at a rate of 60 m3/min, and the circulated air is then pumped out at the same rate. If there is an initial concentration of 0.2% carbon dioxide, determine the subsequent amount A(t), in mº, in the room at time t.
The subsequent amount A(t), in mº, in the room at time t is A(t) = (0.0006 * 60 - 0.002 * 60) * t = (-0.00084) * t
To determine the subsequent amount A(t) of carbon dioxide in the room at time t, we can use the formula A(t) = (C_in * V_in - C_out * V_out) * t, where C_in is the initial concentration of carbon dioxide, V_in is the volume of air pumped into the room per unit of time, C_out is the concentration of carbon dioxide in the circulated air, V_out is the volume of air pumped out of the room per unit of time, and t is the time in minutes.
Given the values C_in = 0.2%, V_in = 60 m³/min, C_out = 0.06%, V_out = 60 m³/min, and t is the desired time, we can substitute these values into the formula to calculate the subsequent amount of carbon dioxide in the room at time t.
Substituting the given values, we have A(t) = (0.0006 * 60 - 0.002 * 60) * t = (-0.00084) * t. Since the coefficient of t is negative, it indicates that the subsequent amount of carbon dioxide in the room will decrease over time.
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The Brazilian rain forest is an area with significant biodiversity.
As the rain forest is replaced with agricultural land, it is
reasonable to predict a reduction in -
consumption of solar energy.
sustainability over time.
precipitation levels.
average daily temperature.
Answer:
sustainability over time.
Explanation:
The largest Brazilian rainforest is the Amazon rainforest, which is the largest rainforest in the world and occupies 42% of the Brazilian territory. The forest is composed of a rich environmental diversity, constituted by many species of fauna and flora and diverse river resources.
However, there is a growing transformation in the Amazon rainforest caused by organizational exploitation that uses its resources to transform the forest area into agricultural land and pastures for livestock. This problem will cause a reduction in sustainability over time, which will cause serious negative effects on the environment, such as a reduction in biodiversity and an increase in the emission of gases responsible for the greenhouse effect on the planet.
Answer:
Bb
Explanation:
f astronauts wished to determine whether a microscopic extraterrestrial object was alive, which feature would they not look for?
If astronauts wished to determine whether a microscopic extraterrestrial object was alive, one feature they would not look for is cellular structure.
Cellular structure, including cells and their organization, is a defining characteristic of life on Earth. However, when examining microscopic extraterrestrial objects, it may not be appropriate to expect the presence of cellular structures similar to those found in terrestrial life forms.
Instead, astronauts would focus on other features that are indicative of life, such as metabolic activity, reproduction, response to stimuli, or the presence of organic molecules. These features are fundamental to the definition of life and can provide evidence of biological processes or signs of life even in microscopic extraterrestrial objects that do not possess cellular structures as we know them.
Therefore, while cellular structure is a key feature of life on Earth, it may not be applicable or present in the same way when examining potential extraterrestrial life forms.
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A Quality analyst is checking the process capability associated with the production of struts, specifically the amount of torque used to tighten the fastener. Twenty five samples of size 4 have been taken. These were used to create X bar and R charts. The values for these charts are as follows: The upper and lower control limits for the X-bar chart are 75 Nm and 72.16 Nm respectively. X double bar is 73.58 Nm, R bar is 1.66. The specification limits are 81.5Nm ± 10. Calculate Cp and Cpk. Interpret the values
A Cp value of 0.168 indicates a low process capability. A Cpk value of 1.26 indicates that the process is slightly off-center.
Calculate the process spread:
Process spread = X double bar ± 3 × R bar
Process spread = 73.58 ± 3 × 1.66
Process spread = 73.58 ± 4.98
Process spread = (68.6, 78.56) Nm
Calculate the process capability indices:
Cp = (Upper Specification Limit - Lower Specification Limit) / (6 × Process spread)
= (81.5 - 71.5) / (6 × Process spread)
= 10 / (6 × Process spread)
Cpk = min((Upper Specification Limit - X double bar) / (3 × R bar),
(X double bar - Lower Specification Limit) / (3 × R bar))
= min((81.5 - 73.58) / (3 × 1.66),
(73.58 - 71.5) / (3 × 1.66))
Calculate Cp and Cpk using the given values:
Cp = 10 / (6 × Process spread)
= 10 / (6 × (78.56 - 68.6))
= 10 / (6 × 9.96)
= 0.168
Cpk = min((81.5 - 73.58) / (3 × 1.66),
(73.58 - 71.5) / (3 × 1.66))
= min(4.81, 1.26)
= 1.26
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Fill in the blanks with suitable pronouns.
1. Baby bird learns to fly
2. The two line intersect _______ at the middle position.
3. ______ had the courage to stand against the unjust treatment to the poor.
4. _______ is on the line?
5. smitha works in a gym ____ is my trainer
1)Baby bird cannot fly. Their mother has to feed \bf\underline{them}them
2. Vijay likes riding my bicycle. I sometimes lend \bf\underline{it}it to \bf\underline{him}him
3. Sooraj and I are brothers. \bf\underline{we\:both}weboth share the same bedroom.
4. Ravina isn't well. Dad is taking to the doctor. (No personal pronouns required)
5. My sister is a teacher. \bf\underline{She}She teaches Maths.Describe how seismic waves can be used to determine the location of petroleum far beneath the surface.
Answer: The seismic waves are useful for the oil and gas exploration beneath the earth crust.
Explanation:
The seismic waves are sent beneath the earth crust to determine the location of fossil fuels like petrol, and natural gas. These seismic waves bound back and their pattern of reflection and refraction is recorded by using a receiver that is a geophone or can be a hydrophone (in water). The seismic waves bounce back indicating towards the reservoir of fossil fuel exhibit a characteristic pattern that can help in tracing the location of the fossil fuel.
What's an conductor?
A.material that electric current passes easily through
B.material that doesn't conduct electrical current
C.Other:
Answer:
A. Material that electric current passes easily through.
Explanation:
Which element does NOT have similar chemical properties to neon (Ne)?
A. F
B. Ar
C. Xe
D. He
The element (A) F (fluorine) doesn't have similar chemical properties to neon (Ne).
The noble gases comprise a group of the periodic table, consisting of six chemical elements: helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), and radon (Rn). The noble gases are the chemical elements that are the least reactive.
They are the lightest and have the smallest atomic radii of any element in their respective periods. Their non-reactivity makes them very useful in a wide range of applications. They are used in lighting, cryogenics, as pressurized gases for spacecraft propulsion, and in the semiconductor industry. The noble gases are located in the last column of the periodic table. The number of electrons in their outermost shell (the valence shell) is the same as the group number.
For example, helium and neon have two valence electrons, and argon has eight. Fluorine, represented by F on the periodic table, is a chemical element with the atomic number 9. It is the lightest halogen and exists as a highly toxic pale yellow diatomic gas at standard conditions. As a member of the halogen group, it is a highly reactive element. Therefore, the option (A) F (fluorine) is not a noble gas and doesn't have similar chemical properties to neon (Ne).
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an object of mass 100 grams hangs from a long spring. when pulled down 10 cm from its equilibrium position and released from rest, it vibrates with a period of 2 seconds. (a) what is the speed of the object as it passes through the equilibrium position?
Given, Mass of the object, m = 100 grams = 0.1 kg. Therefore, the speed of the object as it passes through the equilibrium position is 0.31 m/s. The answer is 0.31 m/s.
Displacement from the equilibrium position, x = 10 cm = 0.1 m, Time period, T = 2 seconds(a) To find the speed of the object as it passes through the equilibrium position, we need to find its maximum speed. We know that the time period, T = 2π √(m/k)where k is the spring constant of the spring. k = 4π²m/T² = 4π² × 0.1/2² = 0.98 N/m, The force exerted on the object, F = kx = 0.98 × 0.1 = 0.098 N. When the object passes through the equilibrium position, all the potential energy is converted into kinetic energy. Therefore, the kinetic energy at the equilibrium position is K.E = 1/2 mv²where v is the velocity of the object. So, equating the potential energy with kinetic energy,1/2 kx² = 1/2 mv²v = x √(k/m) = 0.1 √(0.98/0.1) = 0.31 m/s.
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a student is observing an object of unknown mass that is oscillating horizontally at the end of an ideal spring. The student measure the object's period of oscillation with a stopwatch. While the object is continuously oscillating, the student determines the maximum speed of the object during two oscillations. The first speed is 3.5 m/s and the second speed is 2.7 m/s. Which of the following could account for the decrease in the object's maximum kinetic energy?a. Meterstick
b. Motion sensor
c. Balance
d. Photogate
The following could account for the decrease in the object's maximum kinetic energy: Balance. The correct option is C.
The decrease in the object's maximum kinetic energy could be accounted for by using a balance. A balance is a device used to measure mass, and it is not directly related to the object's kinetic energy. The balance measures the gravitational force acting on the object, which remains constant as long as the mass of the object does not change.
The decrease in the object's maximum kinetic energy during oscillation is likely due to the presence of external factors such as air resistance or friction. These factors can cause energy loss in the system, leading to a decrease in the object's maximum kinetic energy over time.
On the other hand, options a (meterstick), b (motion sensor), and d (photogate) are measurement tools that do not directly affect the object's kinetic energy.
A meterstick is used for measuring length, a motion sensor is used to detect motion, and a photogate is used to measure the time it takes for an object to pass through a gate. These tools do not account for the decrease in kinetic energy observed in the object during oscillation. The correct option is C.
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a light bulb connected across a 6 v battery draws 0.3 a at a particular time. what is the resistance of this bulb at this time (in ohms)?
At that particular time, the resistance of the light bulb is 20 ohms.
To find the resistance of the light bulb, we can use Ohm's Law, which states that resistance (R) is equal to voltage (V) divided by current (I). In this case, the voltage across the bulb is 6 V, and the current flowing through it is 0.3 A.
Using Ohm's Law: R = V/I
Substituting the given values: R = 6 V / 0.3 A
Calculating the result: R = 20 ohms
It's important to note that the resistance of a light bulb can vary depending on factors such as temperature and the specific characteristics of the bulb.
The given value of 0.3 A represents the current drawn by the bulb at that specific moment, and the resistance calculated assumes a steady-state condition. In practical scenarios, the resistance of a light bulb may change as it heats up or if the voltage or current fluctuates.
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A police car is driving north with a siren making a frequency of 1038 hz. Moops is driving north behind the police car at 12 m/s and hard a frequency of 959hz. How fast is the police car going?
Answer:
The police car is moving at 41.24 m/s.
Explanation:
To find the speed of the police car we need to use the Doppler equation:
[tex] f = f_{0}(\frac{v + v_{r}}{v + v_{s}}) [/tex]
Where:
v: is the speed of the sound = 343 m/s
[tex]v_{r}[/tex]: is the speed of the receiver = 12 m/s
[tex]v_{s}[/tex]: is the speed of the source =?
f: is the observed frequency = 959 Hz
f₀: is the emitted frequency = 1038 Hz
Both terms are positive in the fraction because the velocity of the sound is in the opposite direction to both velocities of the police car and the other car.
By solving the above equation for [tex]v_{s}[/tex] we have:
[tex] v_{s} = \frac{f_{0}(v + v_{r})}{f} - v = \frac{1038(343 + 12)}{959} - 343 = 41.24 m/s [/tex]
Therefore, the police car is moving at 41.24 m/s.
I hope it helps you!
Convertir:
A. 3Km a m
B. 250 ma Km
C. 1000Cm a m
D. 10000 mm a Cm
Answer:
A. 3,000,000 m
B. 0.25 km
C. 10 m
D. 1,000 cm
Explanation:
no hablo español, así que solo ingrese esto en el traductor de G*ogle
A. One kilometer equals 1000 meters, so
3,000*1,000 = 3,000,000 m
B. One meter equals 0.001 kilometer, so
250*0.001 = 0.25 km
C. One centimeter equals 0.01 meter
1,000*0.01 = 10 m
D. One milimeter equals 0.1 centimer, so
10,000*0.1 = 1,000
A 60-Hz 220-V-rms source supplies power to a load consisting of a resistance in series with an inductance. The real power is 1500 W, and the apparent power is 3400 VA. Part A Determine the value of the resistance. Express your answer to three significant figures and include the appropriate units. НА ? R= Value Omega Submit Request Answer Part B Determine the value of the inductance. Express your answer to three significant figures and include the appropriate units. ЦА ?
Part A: The value of the resistance is approximately 43.9 Ω.
Part B: The value of the inductance is approximately 0.82 H.
Find the value of resistance and inductance?To determine the resistance and inductance, we'll use the formulas for real power (P), apparent power (S), and power factor (PF).
Given that the real power is 1500 W and the apparent power is 3400 VA, we can write:
P = 1500 W
S = 3400 VA
The power factor (PF) is the ratio of real power to apparent power:
PF = P / S
We know that the power factor is equal to the cosine of the angle between the voltage and current phasors. Since the load is purely resistive and inductive, the power factor can be expressed as:
PF = cos(θ) = R / Z
where R is the resistance and Z is the impedance.
The impedance (Z) can be calculated using the formula:
Z = S / (2πf)
where f is the frequency of the source.
Given that the frequency is 60 Hz, we can substitute the values:
Z = 3400 VA / (2π × 60 Hz)
Now, we can substitute the power factor equation into the impedance equation:
R / Z = PF
R = Z × PF
Substituting the values of Z and PF, we get:
R = (3400 VA / (2π × 60 Hz)) × (1500 W / 3400 VA)
Simplifying the expression:
R ≈ 43.9 Ω
For Part B, we need to find the inductance (L). The impedance can be expressed as:
Z = √(R² + Xₗ²)
where Xₗ is the reactance due to inductance.
Since the load is inductive, we can write the reactance as:
Xₗ = Z × sin(θ)
Substituting the values of Z and PF:
Xₗ = Z × √(1 - PF²)
Using the given values, we can calculate Xₗ:
Xₗ = (3400 VA / (2π × 60 Hz)) × √(1 - (1500 W / 3400 VA)²)
Simplifying the expression:
Xₗ ≈ 30.4 Ω
The reactance due to inductance can be written as:
Xₗ = 2πfL
Solving for L:
L = Xₗ / (2πf)
Substituting the values:
L = 30.4 Ω / (2π × 60 Hz)
Calculating the value:
L ≈ 0.82 H
Therefore, Part A: The resistance in the load is approximately 43.9 Ω.
Part B: The inductance in the load is approximately 0.82 H.
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emotional management is to: prevent, control, redirect, and change. true false
The given statement '' Emotional management is to: prevent, control, redirect, and change '' is True.
True. Emotional management involves various strategies to prevent, control, redirect, and change emotions.
It includes techniques and practices aimed at understanding, regulating, and effectively dealing with emotions in a healthy and productive manner.
By implementing these strategies, individuals can enhance their emotional well-being and improve their ability to cope with different situations.
Hence, The given statement '' Emotional management is to: prevent, control, redirect, and change '' is True.
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When all else remains the same, what effect would decreasing the focal length have on a convex lens?
Answer:
It would cause the lens to produce only real images. It would cause the lens to produce only virtual images. It would make the lens stronger. It would make the lens weaker.
Explanation:
quizlet
Answer:
its c
Explanation:
This parallel circuit has two resistors at 15 and 40 ohms. What is the total resistance?
a. 55 ohms
b. 25 ohms
c. 60 ohms
d. 35 ohms
The total resistance of the circuit, given that parallel circuit has two resistors at 15 and 40 ohms is 11 ohms.
How do i determine the total resistance of circuit?From the question given, the follow data were obtained:
Resistor 1 (R₁) = 15 ohms Resistor 2 (R₂) = 40 ohmsTotal resistance (R) =?The total resistance in the circuit can be obtained as follow:
R = (R₁ × R₂) / (R₁ + R₂) => Parallel arrangement
= (15 × 40) / (15 + 40)
= 600 / 55
= 11 ohms
Thus, we can conclude that the total resistance 11 ohms. None of the options are correct.
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When two magnets attract, they ___________.
A. Pull together
B. Change color
C. Break
D. Push apart
Answer:
A. Pull together
Explanation:
This is because the two magnets are unlike-poles so they attract to eachother
find the torque when the work done to more through an angel of 1/4π radians is 3j
Answer:
The torque is approximately 3.82 N·m
Explanation:
The relationship between work done, 'W', and the applied torque, 'τ' can be presented as follows;
W = τ × Δθ
Where;
W = The work done by the torque
τ = The magnitude of the torque
Δθ = The angle through which the object is turned
The parameters for 'W' and 'Δθ' are;
W = 3j
Δθ = 1/4 × π
From W = τ × Δθ, we have;
τ = W/Δθ
∴ τ = 3j/(1/4 × π) ≈ 3.81971863421 N·m
The torque, τ ≈ 3.82 N·m
0.18 kg of helium is constrained within one portion of an insulated container,such that it fills a volume of only 2.1 . a barrier divides the helium from the rest of the container, which is completely evacuated. for some unknown reason, the barrier ruptures. as a result, the helium expands to fill the entire container. the temperature of the helium remains a constant 340 k before, during, and after the expansion. if the specific volume of the helium increases by a factor of 3.5 during the expansion, what is the final pressure of the helium in kpa?
The final pressure of the helium in kPa would be 28.986 P1 kPa.
Ideal gas problemTo solve this problem, we can use the ideal gas law, which states that:
PV = nRT
where P is the pressure, V is the volume, n is the number of moles, R is the gas constant, and T is the temperature.
Given:
Initial volume of helium (V1) = 2.1 L
Final volume of helium (V2) = 2.1 L * 3.5 = 7.35 L
Amount of helium (n) = mass / molar mass = 0.18 kg / 4 g/mol = 0.045 mol
Temperature (T) = 340 K
Gas constant (R) = 8.314 J/(mol·K)
Using the ideal gas law, we can write the equation as:
P1 * V1 = n * R * T
P2 * V2 = n * R * T
Since the temperature remains constant, we can simplify the equation as:
P1 * V1 = P2 * V2
Substituting:
P1 * 2.1 L = P2 * 7.35 L
P2 = (P1 * 2.1 L) / 7.35 L
P2 = P1 * 0.286
Now, we need to convert the pressure from atm to kPa:
1 atm = 101.325 kPa
P2 (kPa) = P2 (atm) * 101.325 kPa
P2 (kPa) = P1 * 0.286 * 101.325 kPa
= 28.986 P1 kPa.
Therefore, the final pressure of the helium in kPa is approximately 28.986 P1 kPa.
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