Part(a) The equation for the loop is 0 −1−(R1 +R2)I2+(R3+R2)I3=0
Part(b) The current through the bottom branch 13 is 0.75 A.
(a) This equation is found by applying the loop rule, which states that the sum of voltage drops around a loop is equal to zero. To find the equation, we start at the point, and move clockwise around the loop. At each point, we add the voltage drop of the component connected between that point and the previous point. We then substitute the component values into the equation.
For example, the voltage drop across R1 is equal to I2 * R1. In this equation, I2 and I3 are the currents through R2 and R3 respectively.
(b) To calculate this, we need to use Ohm's Law, which states that the voltage across a resistor is equal to the current through the resistor multiplied by the resistance.
First, we need to calculate the total resistance of the circuit.
R total = R_1 + (1/2)*R_2 + R_3
= 0.5 + (1/2)*2.5 + 0.5
= 2.5 Ω
Now, we can use Ohm's Law to calculate the current through the bottom branch.
I 13 = V/R
= (12-0.5)/2.5
= 0.75 A
Therefore, the current through the bottom branch 13 is 0.75 A.
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the figure(figure 1) is a graph of ex. the potential at the origin is -100 v .
This graph shows the potential at the origin as -100 V. The x-axis represents distance from the origin and the y-axis represents the potential.
Potential is the ability to become real or actual. It is the capacity to do something, to become something, or to produce something. Potential is not something that is tangible or visible, but instead is an idea or concept. Potential is the potential to become something greater than what it is currently.
The graph shows that the potential decreases linearly with distance from the origin, indicating that the field has a uniform strength. The graph also shows that the potential at any given distance is equal to the potential at the origin (the y-intercept) minus the product of the distance and the field strength.
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How are the two forces that make up electromagnetic forces related?
a. both are static
b. both gravity and light are caused by the motion of charged particles such as electrons
c. both the electric and magnetic forces are caused by the motion of charged particles such as electrons
d. both can be positive, negative, or neutral
Two forces that make up electromagnetic forces related both the electric and magnetic forces are caused by the motion of charged particles such as electrons and is therefore denoted as option C.
What is Electromagnetic force?This is referred to as the type of force which explains how both moving and stationary charged particles interact due to it occurs between electrically charged particles such as a
The electric and magnetic forces which are present are usually caused by the motion of charged particles such as electrons which is therefore the reason why option C was chosen as the correct choice.
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How do ultrasound waves detect fish?
By sending ultrasonic waves into to the water and listening for the returned echoes, a sonar may find these items.
Does ultrasonography work to find fish?So order to determine which way fish schools are travelling, fish finders employ high frequencies of tightly focused ultrasound that is transmitted at high voltage.
What method is employed to find fish?When a sonar signal or sound wave hits an object, it bounces back into the water.The signal is partially reflected back to the vessel by the fish, while the remaining portion travels to the ocean floor before returning to the boat.
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A ladybug is crawling up a wall at constant speed, as shown above. Which of the following are correct justifications for how forces help the ladybug move up the wall? Select two answers
A constant nonzero net force acts on the ladybug as it moves up the wall.
The ladybug exerts a downward force on the wall to move itself up the wall.
The upward force of the wall on the ladybug moves the ladybug up the wall.
The ladybug exerts an upward force on itself to move it up the wall.
A downward force is applied by the ladybug to the wall in order to advance up the wall, and a vertical force is applied by the wall to the ladybug.
What are the different kinds of force?The definition of force is the power or fuel applied to an item during any positive exercise or movement. A pressure or pull that results from two objects interacting is called a force. External force doesn't actually exist until two objects interact.
Why is force such a big deal?Forces are important because they produce changes to motion, as we learned in a prior lesson. Isaac Newton actually cites this in his first law. This inertia concept describes the phases of stillness and motion that occur in the absence of an external, opposing force.
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Let's try to do this math ourselves from this point. Notice how the s2 term in the acceleration (5 m/s2) and the s term in the time (7 s) cancel leaving you with m/s (velocity).
122 m/s
244 m/s
8.7 m/s
35 m/s
As per the given statement the s2 term in the acceleration (5 m/s2) and the s term in the time (7 s) cancel leaving you with 35 m/s (velocity).
What is velocity?Velocity is the rate of change of speed per unit time. It also determines the direction of the movement of object or moving body. hence, it is called as directional speed.
In its basic form, speed is a scalar quantity. In essence, velocity is a vector quantity. It is the speed at which distance changes. It is the displacement change rate.v=Δx/Δt where v= average velocity, Δx=displacement, Δt=change in time.To know more about velocity visit
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What does the subscript 2 indicate in br2?
The subscript 2 in [tex]Br_2[/tex] indicates that two atoms of bromine are joined together.
[tex]Br_2[/tex], which is a bromine compound, is formed by the combination of two bromine atoms.
At normal temperature and pressure, the original colour of Bromine ([tex]Br_2[/tex]) is a red-brown liquid.
When there is a subscript "2," it signifies that a molecule is made up of two Bromine atoms.
We never use subscripts of "1" while writing the chemical formula, since they are only used when more than one atom is being represented.
When referring to a diatomic molecule, we use the element's symbol and add the subscript "2" to denote the bond between two of that element's atoms.
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The length of the minute hand of the wall clock is 10 cm. How far will the endpoint of this pointer travel in 2 hours?
please help me
The length of the minute hand of a wall clock is not relevant to finding the distance traveled by the end of the pointer in a given amount of time. The only important factors are the length of the hour hand and the amount of time that has passed.
If the length of the hour hand is X cm, then the distance traveled by the end of the pointer in 2 hours can be calculated as follows:
Distance traveled = (X * π * 2) cm
Here, π is the mathematical constant approximately equal to 3.14. The factor of 2 in the formula represents the number of hours that have passed. Therefore, to find the distance traveled in 2 hours, you would need to know the length of the hour hand and substitute it for X in the formula above.
here is a thumb dipped in paint
which of the following of the ripe fruits is around the same size as the coloured part of the thumb
a. strawberry and mango
b lemon and orange
c grape and cherry
d lychee and apple
The ripe fruits is around the same size as the colored part of the thumb are grape and cherry. Hence, option (C) is correct.
What is fruit?Fruit is a blooming plant's fleshy or dry, fully developed ovary that contains a seed or seeds. As a result, apricots, bananas, and grapes are all considered to be fruits as well as bean pods, maize grains, tomatoes, cucumbers, and (in their shells) acorns and almonds. However, the term is typically only used to describe matured ovaries that are delicious and either pulpy or succulent.
A developed ovary and its related elements constitute a fruit in terms of botany. It often contains seeds that have grown from the encased ovule after fertilization, though parthenocarpy, or growth without fertilization, is also known.
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some give me atleast 5
Robot Mass stays the same. Anywhere in the universe, an object has the same mass as it has on Earth. Gravity affects an object's weight. The identical object weighs less on the moon than it does on Earth because there is less gravity there.
What mass of robot on moon and earth?The mass and size of the moon also impact its gravitational pull. The moon won't draw things toward itself with the same force as the Earth because it has a lot less mass than the latter.
Therefore, This implies that even if robot mass remains the same, you would weigh less if you traveled to the moon.
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please can any one answer for this question
Answer:
S = 1/2 g t^2 time for stone to fall distance S
S = V0 (t - 2) * 1/2 g (t -2)^2 time for stone to fall distance S with an initial speed of 30 m/s, 2 seconds later
1/2 g t^2 = V0 t - 2 V0 + 1/2 g t^2 - 2 g t + 2 g equating distance fallen
t = 3.88 sec
Check:
S = 1/2 * 9.8 * 3.88^2 = 73.8 m
S = 30 * 1.88 + 1/2 * 9.8 * 1.88^2 = 73.7 m
a worker drives a .500 kg spike into a rail tie with a 2.50 kg sledgehammer. the hammer hits the spike with a speed of 65 m/s. if one third of the hammers kinetic energy is converted to the internal energy of the hammer and spike how much does the total internal energy increase?
dang, someone help me and explain this pleasseeee!!
Answer:
Explanation:
To find the increase in total internal energy, we first need to find the kinetic energy of the sledgehammer before it hits the spike. We can use the formula:
KE = (1/2) * m * v^2
where KE is the kinetic energy, m is the mass, and v is the velocity.
Plugging in the values, we get:
KE = (1/2) * 2.50 kg * (65 m/s)^2
KE = (1/2) * 2.50 kg * 4225 m^2/s^2
KE = 5212.5 J
Next, we need to find the amount of energy that is converted to internal energy. Since one third of the kinetic energy is converted to internal energy, we can multiply the kinetic energy by 1/3 to find this value:
E = 1/3 * 5212.5 J
E = 1737.5 J
Finally, we need to find the total internal energy increase by adding the energy converted to internal energy to the initial internal energy of the hammer and spike. Since the initial internal energy is zero, the total internal energy increase is simply the energy converted to internal energy:
Total internal energy increase = 1737.5 J
Therefore, the total internal energy increases by 1737.5 J when the sledgehammer hits the spike.
the fourth band of a resistor color code is gold. the fourth letter on a capacitor's code is j. calculate the propagated percent error in the time constant of a circuit using these two circuit elements in series with a d. c. power supply. enter a single digit (
The propagated percent error in the time constant of a circuit is ±10% using these two circuit elements in series with a d. c. power supply.
What is error?The discrepancy between the measured and actual values might be used to define an error.
The fourth band of a resistor color code is gold means ± 5% tolerance in measurement of resistor.
The fourth letter on a capacitor's code is j means ± 5% tolerance in measurement of capacitor.
Now, the time constant of a RC circuit = CR.
Hence, the propagated percent error in the time constant of a circuit using these resistor and capacitor = ± 5% + (± 5%)
= ±10%.
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which statement regarding respiration is correct?
a)respiration in autotrophic organisms occurs only during the day
b)fungi and monerans carry out aerobic respiration only
c)all living organisms carry out some form of respiration
d)all autotrophs and heterotrophs require glucose and oxygen for respiration
Aerobic respiration occurs in the mitochondria's cytoplasm. Anaerobic respiration results in the production of two ATP molecules. Prokaryotes, which are human muscle cells, engage in anaerobic respiration. Thus, option C is correct.
What living organisms carry out some form of respiration?All species' cells engage in cellular respiration. Utilizing oxygen, the cell converts the food (glucose) into carbon dioxide and water. The process of breaking down glucose while using oxygen is referred to as aerobic respiration.
Therefore, all living organisms carry out some form of respiration.
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your electric utility company sends you a monthly bill informing you of the number of kilowatt- hours you have used that month. a. is the utility charging you for energy or power? explain.
Your electric utility company sends you a monthly bill informing you of the number of kilowatt- hours you have used that month therefore the utility is charging you for energy.
What is a Utility?This is referred to as a type of service such as light, power etc which are provided by a public utility.
Electricity utility send us a monthly bill of the number of unit consumed by our appliance per month and the amount you owe is derived by multiplying your utility's rate per kWh by the total kWhs you used that month. It is also how much energy is used over a certain time period which is therefore the reason why energy was chosen as the correct choice.
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part h part complete an l - r - c series circuit has inductance 42.0 mh , capacitance c , and resistance r . without the resistor, the angular frequency of oscillation is 624 rad/s . with the resistor, the angular frequency is 208 rad/s . find the value of c . express your answer with the appropriate units. c
Inductance is 42.0 mh, capacitance is c, and resistance is r in the part h a l - r - c series circuit. The angular frequency of oscillation without the resistor is 624 rad/s. The angular frequency with the resistor is 208 rad/s.
Angular frequency: what is it?The difference between frequency and angular frequency (measured in radians per second) is twofold (measured in cycles per second, commonly known as Hz). Instead of the letter f, the sign stands in for frequency. a sphere with an axis around which it spins. The points farther from the axis are fulfilling and moving more quickly = v / r.
Calculation:inductance (L) = 42 mH
= 42 × 10⁻³ H
Angular frequency (ω) = 620 rad/sec
without the resistor, the angular frequency of oscillation is,
ω = 1/ √LC
or, 1/√LC = 620 rad/sec
or, 1/LC = (620)²
or, C = 1 / (620)²× (42 × 10⁻³)
or, C = 6.19 × 10⁻⁵ F
With resistor, ω = 208 rad/sec
or, ω = R/L
or, R = ωL
or, R = (42 × 10⁻³) × (208)
or, R = 8.736 Ω.
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Question:
An L-R-C series circuit has inductance 42.0 mH, capacitance C, and resistance R. Without the resistor, the angular frequency of oscillation is 624 rad/s. With the resistor, the angular frequency is 208 rad/s.
Find the value of C.
Find the value of R.
What is operant conditioning vs classical conditioning?
Its consequences, either rewarding the desired behavior or punishing the undesired behavior. It is based on the idea that behavior is a function of its consequences. modified by the association of a stimulus with a previously neutral stimulus. It is based on the idea that behavior is a function of its antecedents.
Operant conditioning is a type of learning in which an individual's behavior is modified by its consequences. It is based on the idea that behavior is a function of its consequences, either rewarding the desired behavior or punishing the undesired behavior in order to shape behavior. Classical conditioning is a type of learning in which an individual's behavior is modified by the association of a previously neutral stimulus with a particular stimulus. It is based on the idea that behavior is a function of its antecedents. In operant conditioning, the response is voluntary, while in classical conditioning, the response is involuntary. Operant conditioning focuses on how behavior is strengthened or weakened in response to reinforcement or punishment, while classical conditioning focuses on how behavior is acquired through association.
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a suspension scaffold that uses a two point swing stage anchorage is preferably accessed from?
A suspension scaffold that uses a two point swing stage anchorage is preferably accessed from the ground or from a rooftop, and then either raised or lowered to its working location.
What is a two point adjustable suspension scaffold?A two point adjustable suspension scaffold is sometimes referred to as a swing-stage scaffold and it is considered as the most common type of suspended scaffold.
Additionally, a two point adjustable suspension scaffold is designed and developed to be hung by cables (ropes) that are connected to stirrups at each end of the swing-stage scaffold platform, in order to enable the access of high-rise constructions and buildings.
According to the occupational safety and health administration (OSHA), a two point adjustable suspension scaffold can be accessed through the use of a ladder. However, the most preferred method of access is from the ground or from a rooftop, and then the scaffold should be either raised or lowered to its working location.
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Question 5 Planet X Planet Y Planet Z Mo 9Mo Ro 2Ro At one point in their individual orbits, three planets, X; Y, & Z, are along the same horizontal line. The gravitational force on Planet X from Planet Z is Fo. The distance from the center of mass of each planet to an adjacent planet is given in terms of Ro, and their respective masses are given in terms of Mo, as shown above. What is the net force on Planet Y, and what reasoning supports this claim? AMo
The net force on Planet Y because the gravitational force between planet XY and planet YZ is 5F₀.
Full question is in the attachment. Formula to calculate the gravitational force between two objects
F = G × (m₁ × m₂ ÷ r²)
m = the mass of the object (kg)The direction of the gravitational force between two objects on the first object is from the first object to the second object. The gravitational on planets X and Z
F₀ = G × (m₁ × m₃ ÷ r₃²)
F₀ = G × (M₀ × 9M₀ ÷ (3R₀)²)
F₀ = G × (9M₀² ÷ 9R₀²)
F₀ = G × (M₀²/R₀²)
On planet Y there are two forces
The gravitational force with planet XThe net force on planet Y
F = F₂ - F₁
F = 9F₀ - 4F₀
F = 5F₀
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a swimmer swims 100m through the water with a force of 200 Newtons.
How much work did the swimmer do?
A. 20000 Nm
B. 2 Nm
C. 0.5 Nm
Answer: A. 20000 Nm
Explanation:
The Work formula is:
Work = Force x Displacement
For this question:
Force is 200N
Displacement is 100m
So 200N x 100m = 20000Nm
Hope this helps!
What is the equation that shows the inverse relationship between energy of light and its frequency?
A inverse relationship in between photon's energy (E) and the light's wavelength is described by the formula E=hcE=hc, where h has so far been Planck's constant and c is actually the speed of light.
What connection exists between light frequency and energy?Energy --> Frequency The energy of light increases with its frequency.
Higher frequencies result in shorter wavelengths, as the challenges mentioned above demonstrate.E is also equal to h c / λ.Short wavelengths & high energies characterize high frequency light.
Does the energy of light and its frequency have an inverse relationship?Energy is inversely correlated with wavelength because it is directly related to a electromagnetic frequency of the photon.The energy of a photon increases with its frequency.
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Why is communication an important part of the scientific process
Answer:
Communication is a vital component to the scientific process. It helps the scientist, if he/she was making an invention, tell people or get advice about the project, which couldn't be done without communication. Scientists need to communicate to learn, get advice, and collaborate with one another.
What is cutoff frequency formula?
The cutoff frequency formula is 1 / (2 * pi * R * C).
What do you mean by cutoff frequency of a device?
The cutoff frequency of a device or system is the frequency at which its response starts to fall off sharply. It is the frequency above which the device or system does not pass or amplify signals effectively.
The cutoff frequency of a device or system can be calculated using the following formula:
cutoff frequency = 1 / (2 * pi * R * C)
where R is the resistance of the device or system, and C is the capacitance of the device or system.
The cutoff frequency is often used to describe the performance of electronic filters, such as low-pass filters, high-pass filters, and band-pass filters. It is also used to describe the performance of other types of systems, such as microphones and speakers.
Therefore, the cutoff frequency is formula is 1 / (2 * pi * R * C).
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a wire that is 0.50 m long and carrying a current of 8.0 a is at right angles to a uniform magnetic field. the force on the wire is 0.40 n. what is the strength of the magnetic field? question 24 options: 0.010 t 0.10 t 1.0 t 10 t
The force divided by the product of the wire length and current through the wire gives the strength of magnetic field. The magnetic field here is 0.1 Tesla.
What is magnetic field strength?A magnetic field can be produced from the deflecting coil or wire carrying current. The magnetic field lines produced will be perpendicular to the field lines from the electric field.
The force acting on the combined field is the product of the magnetic field strength B, length of the wire L, and the current passing through the wire I as written below:
F = B I L
Given that the length L = 0.50 m
current I = 8 A
and force f = 0.40 N.
Thus, magnetic field strength B = F/I L
= 0.40 / ( 0.50 m× 8 A)
= 0.1 T.
Therefore, the field strength is 0.1 T.
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What does the 2 in mgcl2 indicate?
The 2 in MgCl2 indicates that in the given compound there are 2 ions of Chlorine used.
As we know,
The valency of Magnesium is 2, while the valency of Chlorine is 1.
So, for forming a compound we need 2 ions of Chlorine with 1 ion of Magnesium.
MgCl2 is commonly known as Magnesium bromide which is formed by the combination of magnesium and bromine.
In chemistry for representing a diatomic molecule, or simply the molecules which have 2 atoms, we often use the symbol of the element and include 2 in the subscript for indicating that two atoms of that element are joined together.
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What are the 3 main causes of CO2 emission?
The primary global sources for carbon dioxide emissions are electricity and heating (31%) as well as farming (11%), transportation (15%), forestry (6%) and manufacturing (12%).
Which three things cause carbon dioxide emissions?These sources can be found primarily in three different contexts: industrial processes, natural gas processing, and fuel combustion activities.By far, burning fossil fuels causes carbon to oxidize, which is what causes the biggest CO2 emissions.
What are the four main sources of carbon?The combustion of fossil fuels including gas, coal, and oil, deforestation, and volcanic eruptions are a few examples of carbon sources.
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A great strength of correlational research is the
O cause-effect sequencing of events.
O ambiguity of the results.
O ability to extract the influence of confounded variables.
O fact that it occurs in real-world settings.
Option D; A great strength of correlational research is the fact that it occurs in real-world settings.
When doing correlational research, which is a type of nonexperimental study, the researcher examines two variables and assesses their statistical relationship (i.e., the correlation) with little to no effort made to account for unrelated variables. Since it helps us to ascertain the magnitude and direction of correlations between two variables, correlational research is helpful. Contrarily, correlation is limited since it only provides evidence of a link and provides little information about its underlying mechanisms. Through the correlational method, relationships between variables are sought. For instance, a researcher would be interested to know if a user's privacy preferences in a social networking software are influenced by their personality, IQ, level of education, employment status, age, gender, income, and other factors
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A diffraction pattern involving parallel rays is called ___________ diffraction.
Select one:
a.Einstein
b.Poisson
c.Fraunhofer
d.Fresnel
A diffraction pattern involving parallel rays is called (c) Fraunhofer diffraction.
Because of the far-field location of observation and the increasingly planar nature of the outgoing diffracted waves passing through the aperture, Fraunhofer diffraction is a type of wave diffraction that takes place when field waves are passed through an aperture or slit. This only results in a change in the size of the observed aperture image.
The parallel rays approximation can be used to view it at distances beyond the near-field distance of Fresnel diffraction, which modifies the size and form of the observed aperture image. This only happens when the Fresnel number at these distances.
Fraunhofer diffraction, which is typically explained through the use of observational experiments utilizing lenses to intentionally diffract light, is based on the notion that a wave is split into many outgoing waves when passing through an aperture, slit, or hole. When waves pass through, they are split into two diffracted waves that move at right angles to one another and the remaining incoming wave. These waves are frequently used in observational techniques by placing a screen in their path so that the image-pattern observed can be seen.
Fraunhofer's diffraction equation:
= (See Diffraction - Single-slit diffraction):
= I (θ) = I 0 (sin (d π λ sin θ) d π λ sin θ) 2
where,
d is the slit width, λ is the wavelength, and θ is the observed angle.
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9. An astronaut weighs 500 Newtons on Earth and 25
newtons on asteroid X. The acceleration due to
gravity on asteroid X is approximately
A) 1 m/s²
C) 0.2 m/s²
B) 2 m/s²
D) 0.5 m/s²
The acceleration due to gravity on asteroid X is approximately 0.5 m/s². The acceleration an object experiences as a result of gravitational force is known as acceleration due to gravity.
What is acceleration due to gravity ?To calculate the acceleration due to gravity on asteroid X, you need to first determine the mass of the astronaut. Since weight is a measure of the force of gravity on an object, and the force of gravity is directly proportional to the mass of the object, the mass of the astronaut can be calculated by dividing the weight on Earth by the acceleration due to gravity on Earth.The acceleration due to gravity on Earth = 9.8 meters per secondThe mass of the astronaut = 500 Newtons / 9.8 m/s^2, 50 Kg
The equation for gravitational force is F = Gm1m2/r^2,
where F is the force of gravity, G is the gravitational constant, m1 and m2 are the masses of the two objects, and r is the distance between them. Solving for r, you can calculate that the distance between the astronaut and the center of asteroid X is approximately 5 meters. Since the acceleration due to gravity is defined as the force of gravity divided by the mass of the object, you can use this distance to calculate the acceleration due to gravity on asteroid X. Dividing the force of gravity on the astronaut (25 Newtons) by the mass of the astronaut (51 kilograms).Calculate that the acceleration due to gravity on asteroid X = 0.49 meters per second squared.
That is 0.5 m/s²
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the w10×15 cantilevered beam is made of a-36 steel and is subjected to the loading shown.(figure 1)
A-36 steel is used to construct the w10x15 cantilevered beam, which is put under the indicated loading.
Moment of inertia for w10×15 is equal to 68.9in4 and Young's modulus for A–36 steel is equal to 29e3 ksi. Thus Slope at B can be given as,
θB = P₂x³/ (2EI) + P₁l³/ (2EI)
θB = (5 × 6³ + 9 × 12³)/ (2 × 29 × 10³ × 68.9)
θB = 0.0042rad
Therefore , displacement at B can be written as,
yB = P₂x³(3l - x)/ (6EI) + P₁l³(3l - l)/ (6EI)
yB = ( 5 × 6³ × (3 × 12 - 6) + 9 × 12³ × 2 × 12)/ (6 × 29 × 10³ × 68.9)
yB = 0.034ft
The given question is incomplete,
The W10×15 cantilevered beam is made of A-36 steel and is subjected to the loading shown. Suppose that w = 2.7 kip/ft .E = 29 (103) ksi and I = 68.9 in4. (Figure 1) Determine the slope of the beam B, measured counterclockwise from the positive x axis. Determine the displacement of the beam at B.
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You are going to invent a new device that people can use instead of a microwave to warm up leftovers. Which type of electromagnetic wave would be most useful to investigate?.
If we are going to invent a new device that people can use instead of a microwave oven to warm up leftovers, the type of electromagnetic wave that would be most useful to investigate would probably be infrared waves.
Electromagnetic waves or EM waves are waves that are created as a result of vibrations between an electric field and a magnetic field.
Since electromagnetic waves are of different energy range and different electromagnetic waves are used for different works.
Higher energy range electromagnetic waves cannot be used to expose for human because they can cause damage to them. So, we can not use them for warming purpose as they are dangerous. So X rays and Gamma rays can not be used
And least energy waves can also not be used. So, radio waves which are least energy cannot be used for the purpose of warming.
So correct answer for the replacement of microwaves is infrared waves because they have sufficient energy that can be used to warm up.
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