The given statement that a star moving away from us, we observe the light to be shiftest towards the blue end of spectrum is a false statement.
This phenomenon is called doppler effect. Doppler effect of light can be described as the apparent change in the frequency of the light observed by the observer due to relative motion between the source of light and the observer
In the given situation, the source of the waves is the star, which emits light (the waves). The observer is on Earth, and the star (the source of the waves) is moving away from the observer, so, wavelength of the light observed by us is shifted with respect to the original wavelength of the light emitted by the star.
when the star moves away, the wavelength increases, so it shift towards the red end of spectrum. This effect is called red-shifted.
In the given case, the star is moving away from us, so light will shift towards red end of spectrum.hence, The given statement is false.
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what type of solar heating system would be most efficient at producing high-temperature water for industrial applications or steam to run turbines that generate electricity?
Angela092505's response Solar thermal electric generation systems that use mirrors or lenses to focus sunlight to heat water are the answer.
define solar heating ?
The use of sunlight to heat water or air in buildings is known as solar heating. Solar heating is classified into two types: passive and active.
To heat buildings, passive heating relies on architectural design. The location, construction, and materials of the building may all be used to optimise the heating (and lighting) impact of the sunshine falling on it, minimising or even eliminating the need for fuel. On sunny days, a well-insulated structure with a large glass window facing south, for example, can efficiently trap heat and decrease dependency on gas or oil (for heating) or electricity (for lighting). Natural convection warms the air and solid surfaces in rooms exposed to sunlight, and this warmth is carried to other rooms in the building.
What kind of solar heating system is most efficient in producing high-temperature water for industrial uses or steam to power turbines that generate electricity Angela092505's response Solar thermal electric generation systems that use mirrors or lenses to focus sunlight to heat water are the answer.
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Suppose the temperature of an ideal gas (in degrees Kelvin) is increased by a factor of 4?1)What happens to the average translational speed of the molecules in the gas?It increases by a factor of 2.It increases by a factor of 4.It increases by a factor of 16.
Suppose the temperature of an ideal gas (in degrees Kelvin) is increased by a factor of 4 so the average translational speed of the molecules in the gas gets doubled
We are aware that an ideal, monoatomic gas consists of:
Kinetic Energy is directly related to temperature.
Kinetic Energy = 1/2 x mv²
m = the gas's mass
v - the gas's speed
As a result, the square of the gas's velocity is directly proportional to its temperature.
As a result, if velocity (or speed) doubles, the Kelvin temperature will increase by a factor of four from its initial value.
The root mean square velocity will double if the velocity of every atom doubles.
As well as this, we are aware of root mean square velocity Vrms = v(3RT/molar mass).
Therefore, Vrms is inversely proportional to T's square root (temperature )
Vrms = √T
if temperature increase by a factor of 2,
Vrms = √2
if temperature increase by a factor of 4,
Vrms = √4
Vrms = 2, it gets doubled
if temperature increase by a factor of 16,
Vrms = √16
Vrms = 4, it gets doubled than temperature increase by a factor of 4
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a spring with a constant 585 n/m is placed vertical on the ground a 2.3 kg mass is placed on the spring and the spring is compressed 21.5 cm. the spring is released and the mass is launched directly up in the air what is the maximum height the mass reaches above its initial position
The maximum height up to which the mass reaches above its initial position is 71cm.
According to the law of conservation of energy, energy can never be created nor be destroyed so all the energy of the spring will be converted into the potential energy of the mass.
Now, we can calculate the height till which the mass will reach in the air from its initial position,
1/2Kx² = Mgh
Where,
K is the spring constant,
x is the compression in the spring,
M is the mass of the object,
g is the gravitational acceleration and,
h is the height till reach the mass will be launched in the air.
It is given to us that the spring constant is 585N/m, the mass of the object is 2.3 kg and 8 is producing a compression of 21.5cm in the spring.
Now, putting all the values to find the vertical height of the object,
1/2(585)(0.215)² = 2.3(9.8)h
h = 0.49m
h = 49cm.
So, the vertical height of the object will be 49 centimetre.
The distance from initial position is 71cm.
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a 12 kilogram cart is moving at a speed of .25 meter per second after the speed of the cart is tripled the inertia of that cart will be
A 12 kilogram cart is moving at a speed of 0.25 meter per second after the speed of the cart is tripled the inertia of that cart will be will be 12 kilograms.
The inertia of an object is a measure of its resistance to changes in its state of motion. Inertia is directly proportional to the mass of the object. This means that if the mass of an object is increased, its inertia will also increase. In this case, the mass of the cart is 12 kilograms, and its speed is 0.25 meters per second. If the speed of the cart is tripled, the inertia of the cart will not change because the mass of the cart remains the same. The inertia of the cart will still be 12 kilograms. It is important to note that the speed of an object does not affect its inertia. Inertia is determined solely by the mass of the object. Every item maintains its condition of uniform motion in a straight direction or of rest unless it is compelled to do otherwise by forces applied to it. The Latin word iners, which means idle or sluggish, is where the word "inertia" originates. The resistance of any physical object to a change in velocity can also be referred to as inertia.
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what is the wavelength in nanometers of light when the energy is 1.91 × 106 j for a mole of photons?
E=hc/λ = 1.91 × 10^6
J = (6.626*10^-34) (3.00*10^8) / λ
λ= (6.626*10^-34) (3.00*10^8) / 1.91 × 10^6 J
λ= 1.0410^-31 10^-9 *6.022*10^23 = 62. 8 nm
a solid aluminum cube rests on a wooden table in a region where a uniform externalelectric field is directed straight upward. what can we say concerning the charge on thetop surface of the cube?
The charge concerning is positive. Electrons can freely migrate since aluminum is a conductor. Due to the electric field's upward direction, all of the aluminum cube's electrons will fall to the cube's bottom.
As a result, the cube's top will be positively charged. The physical characteristic of matter that causes it to feel a force when exposed to an electromagnetic field is called electric charge. The two types of electric charges that protons and electrons most frequently carry are positive and negative charges. Charged particle flow is what makes up an electric current. Free electrons are the charged particles in metal conductors. Since the electrons are free to go from one ion to another, an electric current is created when there is net flow in one direction.
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Why are we using raisins to observe
osmosis?
We are using raisins to observe osmosis.
What is osmosis?Osmosis is the spontaneous net movement or diffusion of solvent molecules through a selectively-permeablity of the membrane from a region to the high water potential energy to a region of lower water potential energy, in the direction that tends to the equalize the solutes the concentrations on the 2 sides.
Each one of them gaining H2O and swells when placed in pure water due to the endosmosis. When such as swollen raisins/apricots are the placed in to the concentrated Solution, each of them are loses, water and the consequently shrinks is again (due to exosmosis).
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a young girl wishes to select one of the frictionless playground slides shown below to give her the greatest possible speed when she reaches the bottom of the slide. which slide should she choose?
The girl may choose any of the slides. It is irrelevant. She would move at the same pace down each slide.
At the top of the slide, the youngster initially has gravitational potential energy. The youngster possesses thermal energy as well as kinetic energy when they reach the bottom of the slide since some of the energy was heated up due to friction. The curved slide is the fastest despite being longer than the other circuits. This is due to the fact that it is steeper at first, leading the ball to be more affected by gravity and accelerate more quickly before reaching its top speed.
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when light reflects from a surface, there is a change in its a. frequency. b. wavelength. c. speed. d. all of these e. none of these
When light reflects from a surface, there has no change in its frequency, wavelength and speed. So, option (e) is correct.
What is reflection of light?It is known as light reflection when a light ray strikes a perfectly smooth, polished surface and reflects back. The surface reflects the incident light rays that come in contact with it. Reflected ray refers to the ray that returns. A perpendicular would be referred to as normal if it were drawn on a reflective surface.
In reflection, frequency, wavelength and speed of the light wave remains same and only the direction of light changes.
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choose the statement which is not correct when describing atrial flutter. a. a reentry circuit is created. b. ectopic impulses occur within the right atrium. c. heart rate increases to as high as 150 bpm. d. pr interval is impossible to compute.
An incorrect statement when describing atrial flutter is that the heart rate increases to as high as 150 bpm.
Atrial flutter is a cardiac arrhythmia characterized by an atrial frequency of 240-400 bpm accompanied by signs of atrioventricular node conduction blockade. Atrial flutter is formed due to macro reentrant atrial tachycardia (MAT) which runs around the tricuspid annulus, then superiorly along the atrial septum, to the atrial wall inferiorly, across the cavotricuspid isthmus.
Atrial flutter, also known as atrial tachycardia asthmacroreentrant, is a reentry arrhythmia that spreads around the tricuspid valve annulus.
Re-entry ventricular arrhythmia is a type of paroxysmal tachycardia that occurs in the ventricles where the cause of the arrhythmia is that the electrical signal does not complete the normal circuit, but rather an alternative circuit that loops back on itself. There thrives an abnormally rapid and self-perpetuating activation.
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maximum muscle loading at a fixed speed with accommodating resistance throughout the entire range of motion is characterized by what method of exercise?
Maximum muscle loading at fixed speed with accommodating resistance throughout entire range of motion is characterized by : Isokinetic exercise.
What is isokinetic exercise?Isokinetic training is a sort of exercise that makes use of a unique machine. There are many levels of resistance produced by the exercise equipment. No matter how much force is used, motions are always made at the same speed. No matter how strong you are, a machine can always exert as much force as you do.
Isokinetic exercise includes cycling on a stationary bike. Your muscles will contract at the same rate across the entire range of motion if you walk at a consistent speed.
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a monochromatic light beam is incident on a barium target that has a work function of 2.50 ev. if a potential difference of 1.00 v is required to turn back all the ejected electrons, what is the wavelength of the light beam?
The wavelength of the light beam is 497 nm.
Given,
Stopping Potential, V₀ = 1.00 eV
Work function, ϕ = 2.50 eV
Speed of light, c = 3 x 10⁸ m/s
Charge of electron, e = 1.6 x 10⁻¹⁹ C
Planck's constant, h = 6.63 × 10⁻³⁴ Js = 4.14 × 10⁻¹⁵ eVs
The expression for Einstein's photoelectric equation is:
KEₘₐₓ = E - ϕ ----- (1)
Where,
KEₘₐₓ is the maximum kinetic energy
E is the energy of the absorbed photons: E = hf
ϕ is the work function of the surface: ϕ = hf₀
The potential difference required to back all ejected electrons is called the Stopping Potential (V₀).
Stopping Potential (V₀) = KEₘₐₓ/e -----(2)
Substituting (2) into (1)
eV₀ = E - ϕ
1.6 x 10⁻¹⁹ x 1 = E - 2.50
E = 1.6 x 10⁻¹⁹ + 2.50
E = 2.50 eV
We know that,
E = hf
E = hc/λ [∵ f = c/λ]
λ = hc/E
λ = (4.14 × 10⁻¹⁵ × 3 x 10⁸) / 2.50
λ = 1240 × 10⁻⁹ / 2.50
λ = 496.8 × 10⁻⁹ m
λ = 497 × 10⁻⁹ m (approximately)
λ = 497 nm
Hence,
The wavelength of the light beam is 497 nm.
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a 5.0 kg rabbit and a 12.0 kg irish setter have the same kinetic energy. if the setter is running at a speed of 3.7 m/s, how fast is the rabbit running?
The setter is running at a speed of 3.7 m/s , Running at a speed of 7.59 meters per second is the rabbit. So, the rabbit is faster than irish setter.
A body's kinetic energy may be calculated using the equation
1/2m1v12 = 1/2m2v22.
If the kinetic energy of the rabbit and the Irish setter is equal, then
The rabbit's kinetic energy is equal to the setter's kinetic energy.
Where m1 is the mass of the rabbit, v1 is its speed, and m2 is the mass and v2 is its speed of the setter.
Making the variable v1 the subject of the equation v1 = v2(m2/m1)... Equivalent 3
Given: v2 = 4.9 m/s, m1 = 5.0 kilogram, and m2 = 12.0 kg.
Equation 3 is changed by using v1 = 4.9(12/5) v1 = 4.92.4 v1 = 4.91.549 v1 = 7.59 m/s speed .
The rabbit is therefore moving at speed of 7.59 m/s.
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a boat parked on a riverbank needs to reach a point 30 directly across the river on the opposite bank. in still water, the boat moves at 4 . if the river has a current of 2 flowing parallel to the riverbank, how long does it take the boat to cross the river?
It will take the boat 5 seconds to cross the river.
To determine how long it takes the boat to cross the river, we need to take into account the speed of the current as well as the speed of the boat.
The speed of the boat relative to the water (the speed of the boat plus the speed of the current) is given by the equation:
v_rel = v_boat + v_current
where v_rel is the speed of the boat relative to the water, v_boat is the speed of the boat in still water, and v_current is the speed of the current.
In this case, the speed of the boat in still water is 4 m/s and the speed of the current is 2 m/s. Plugging these values into the equation gives us the speed of the boat relative to the water of:
v_rel = 4 m/s + 2 m/s = 6 m/s
To determine the time it takes the boat to cross the river, we can use the equation:
t = d / v
where t is the time, d is the distance to be traveled, and v is the speed.
In this case, the distance to be traveled is 30 m and the speed is the speed of the boat relative to the water (6 m/s). Plugging these values into the equation gives us a time of:
t = 30 m / 6 m/s = 5 s
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commercial jets usually land using a 3-degree angle of descent. at what distance from the destination airport should the pilot begin the descent, if the cruising altitude of the jet is 37000 feet?
To obtain a 3 degree drop, begin your descent three times your altitude (measured in thousands of feet).
Start down at 3 x 50 = 150 miles out if you are at 45,000 feet, for ease of calculation, round the height up to 50. When an airplane is between 100 and 120 miles from its destination, it often starts to descend (assuming the cruising altitude is above 30,000 feet). Typically, people use some variation of the 3/6 to larger aircraft: The distance back to begin the fall is 3 times the height (in thousands of feet), and the descending rate is 6 times your ground speed.
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imagine you are running around a circular track at a constant speed. explain how you can determine how fast you are moving around the track. what must you measure, and how do you calculate your speed
A thing that is rotating in a circle at a uniform or constant speed is said to be in uniform circular motion. The magnitude of the velocity vector is constant, but the direction changes.
Any item moving in a circle with a constant radius always completes the circle in the same period of time. Its period refers to that period. Many people believe that there is no acceleration because the speed is constant for such a move. Any item that is modifying its velocity is said to be accelerating. Additionally, because velocity is a vector with both magnitude and direction, a change in either one of them results in a change in velocity. It is acceptable to assume that an object travelling in a circle at a constant speed is accelerating as a result of this. Because the velocity vector's direction is shifting, it is accelerating.
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what is the volume of 6.00 m nitric acid that contains 6.302 g of hno3 solute (63.02 g/mol)?
16.7 mL is the volume of 6.00 m nitric acid that contains 6.302 g of [tex]HNO_{3}[/tex]solute (63.02 g/mol) .
[tex]HNO_{3}[/tex] is the formula of Nitric acid. This mineral acid is extremely corrosive. The substance is colourless, but older samples may have a yellow hue from breakdown into nitrogen oxides. The majority of nitric acid that is sold commercially has a 68% concentration in water. Nitric acid that is flaring when the solution contains more than 86% [tex]HNO_{3}[/tex] Fumigating nitric acid can also be classified as red fuming nitric acid at concentrations over 86% or white fuming nitric acid at concentrations above 95%, depending on the amount of nitrogen dioxide present. By adjusting the final volume and concentration to be equal to the initial volume and concentration, we can determine the volume of concentrated acid that is required.
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a particle of mass and charge has an initial speed at point a and moves to a point b where the electric potential is greater than at point a. what is the particle's kinetic energy at point b?
A particle of mass and charge has a starting speed at point a and goes to a point b where the electric potential is greater than at point a. At location b, the particle has a kinetic energy of 1/2mua2-q (V)
Given mass of particle is m and charge is q
At point a let the electric potential be Va and speed is ua
At point b let the electric potential be Vb and its speed be ub
The electric potential at b is greater than at point a So, let the electric potential at a be Va = 0 such that Vb>Va and Vb = V
At point b the particle comes to rest so the speed at point be zero. ub=0
by conservation of energy 1/2mua^2+q Va = 1/2mub^2+qVb
According to kinetic energy formula we say KE = 1/2MV^2
So Kinetic energy at point b is KE(b) = 1/2mua^2+q Va = 1/2mub^2+qVb = 1/2mua^2 +q(0-V)
KE(b) = 1/2mua^2-q(V)
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the difference between the emitted frequency and the echo frequency returning from a moving scatterer is called
The Doppler effect, described in 1842 by Christian Andreas Doppler, is the change or shift in the frequency or wavelength of a wave due to relative movement between a sound source or scatterer and the receiver.
Formula
[tex]$$f_o=\frac{v+v_o}{v+v_s} f_s$$$f_0=$ observer frequency of sound$v=$ speed of sound waves$v_o=$ observer velocity$v_s=$ source velocity[/tex][tex]$f_s=$ actual frequency of sound waves[/tex]
The Doppler effect is a phenomenon that occurs when two objects move closer or farther apart, increasing (or decreasing) the frequency of sound, light, or other waves. A source's waves are compressed as they move in the direction of the observer.
The Doppler effect operates as follows: When a loud object approaches you, its sound waves congregate and increase in frequency or pitch. On the other hand, the sound waves spread apart and the pitch drops as the object moves away from you. The pitch change increases with object speed.
The Doppler effect causes the frequency of light waves coming from moving sources to either shift to the blue or red. This behaves in a way that is similar to other types of waves, such sound waves, but not exactly the same.
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FILL IN THE BLANK. ____ are neutron stars that have magnetic fields 100 times stronger than the average neutron star.
Magnetars are neutron stars that have magnetic fields 100 times stronger than the average neutron star.
what are the salient features of a hydrodynamic entry region? a thermal entry region? are hydrodynamic and thermal entry lengths equivalent? if not, on what do the relative lengths depend?
Inviscid flow region and boundary regions are the salient features of a hydrodynamic entry region, a thermal entry region are hydrodynamic and thermal entry lengths equivalent.
A material's capacity to conduct heat is determined by its thermal conductivity. In contrast to materials with high thermal conductivity, low thermal conductivity materials transmit heat more slowly. For instance, insulating materials like Rockwool or Styrofoam are effective at retaining heat while metals often have high thermal conductivity and are very effective at transferring heat. In line with this, materials with high thermal conductivity are frequently used as heat sinks, whereas those with low thermal conductivity are employed as thermal insulation. Thermal resistance is the inverse of thermal conductivity. Working with numbers that are derivatives of thermal conductivity and that implicitly account for design-specific details like component dimensions is a typical practice in engineering. For instance, the amount of heat that travels through a plate of a certain area and thickness in a unit of time when the temperatures on its opposing faces differ by one kelvin is known as thermal conductance. Similar to how electrical conductivity and electrical conductance relate to one another, thermal conductivity and conductance do the same. The opposite of thermal conductivity is thermal resistance.
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if you drop a rubber ball it doesn't bounce back to the height you dropped it from. this is consistent with:
If you drop a rubber ball it doesn't bounce back to the height you dropped it from. this is consistent with: the second law of thermodynamics.
A solute moving from a high-concentration area to a low-concentration area. Molecules travel passively, following the gradient of concentration from high to low concentration, using NO energy.
The second rule of thermodynamics is a physical principle founded on the knowledge of how heat and energy are transformed throughout the world. A straightforward explanation of the rule is that heat always transfers from hotter to cooler things (or "downhill") unless energy of some kind is used to change the flow of heat.
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a ball rolls horizontally off the edge of a cliff at 4.00 m/s. if the ball lands a distance of 30.0 m from the base of the vertical cliff, what is the height of the cliff?
When a ball rolls horizontally off the edge of a cliff at 4.00 m/s, then the height of the cliff is calculated as 276 m.
What is projectile motion?The motion of any object thrown or projected into the air is called projectile motion. Form of motion experienced by object that is projected in a gravitational field is called projectile motion.
d is distance ;velocity is v= 4m/s
As, d = v t
30.0 = 4.00 t
So, t = 7.50 s
We know that, h = 1/2 g t^2
h = 1/2 (9.81) (7.5)^2
h = 275.9
Hence, h = 276 m
The height of the cliff is 276 m.
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A 4.8-kg suitcase is sliding across the horizontal floor of an elevator. The coefficient of kinetic friction between the suitcase and the floor is 0.28.
a) If the elevator is moving upward at a constant speed of 1.6 m/s, find the kinetic frictional force acting on the suitcase.
b) If the elevator is accelerating upward at 1.6 m/s?, find the kinetic frictional force acting on the suitcase
c) If the elevator is accelerating downward at 1.6 m/s, find the kinetic frictional force acting on the suitcase.
Answer:
Below
Explanation:
a) At constant speed the only force acting downward is the usual Normal Force due to gravity
Fn = mg = 4.8 * 9.81 =47.1 N
the force of friction is then Ff = Fn * coeff = 47.1 * .28 = 13.2 N
b) If the acceleration is UPWARD this adds to g
Fn then becomes
Fn = 4.8 ( 9.81 + 1.6) = 54.8 N and Ff = 54.8 * .28 = 15.3 N
c) Similar to b) but this time the acceleration of the elevator SUBTRACTS from gravity
Fn = 4.8 ( 9.81 - 1.6) = 39.4 N and Ff = 39.4 * .28 = 11.0 N
Find the time it will take a 200 Watt motor to lift a 80kg load to a height of 2m. Use 3 sig figs and do not include units
Answer:
1.25
Explanation:
To find the time it will take a motor to lift a load to a given height, we need to use the formula for power.
The formula for power is given by:
P = W/t
where P is the power of the motor, W is the work done by the motor, and t is the time it takes for the motor to do the work.
In this case, we are given that the power of the motor is 200 Watts, the weight of the load is 80 kg, and the height to which the load is lifted is 2 meters. We can use these values to solve for the time it takes for the motor to lift the load.
First, we need to calculate the work done by the motor. The work done by the motor is equal to the weight of the load multiplied by the height to which the load is lifted:
W = F * d
W = 80 * 2
W = 160
Next, we can use the formula for power to solve for the time it takes for the motor to lift the load:
P = W/t
200 = 160/t
t = 1.25
Therefore, it will take the motor 1.25 seconds to lift the 80 kg load to a height of 2 meters.
Of the three websites you read that weren't trying to sell a product (Wikipedia, American
Pregnancy, and Health Prep), which site did you feel presented the most objective, unbiased
information about cord blood banking? Of all the sites you looked at, which did you feel was least
objective and most biased? Why?
The site that i think feel presented the most objective, unbiased information about cord blood banking is Wikipedia because it tends to give you different opinions or views from different expert in those field.
What is cord blood banking used for?Anyone who needs stem cells, including a member of your close family, can benefit from cord blood banking. Your baby's cord blood contains stem cells. Numerous life-threatening diseases, including cancer, have been found to benefit from the use of stem cells from cord blood.
The following are some drawbacks of cord blood banking: Since there aren't enough stem cells in cord blood, adults who need transplants will need cord blood stem cells from several donors. In a private bank, people must pay a fee to store their cord blood, which could be pricey.
Therefore, the American Medical Association and the American Academy of Pediatrics advise against saving cord blood as a sort of "biological insurance," as the rewards are insufficient to outweigh the disadvantages. Hence i believe Wikipedia gave me varieties of text about the issue.
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A uniform lead sphere and a uniform aluminum sphere have the same mass. What is the ratio of the radius of the aluminum sphere to the radius of the lead sphere?
The ratio of the radius of the aluminum sphere to the radius of the lead sphere can be represented as:
[tex]\displaystyle \frac{r_{Al}}{r_{Pb}} =\sqrt[3]{\frac{\rho_{Pb}}{\rho_{Al}} }[/tex]
What is the density?The density of a material can be measured as the mass per unit volume of the material. The average density equals the mass divided by its total volume.
The mathematical formula for the density can be expressed as follows:
Density = Mass/Volume
The S.I. unit of the density that is used to measure is Kg/m³. If the size increases, the mass increases as well but the density remains constant.
Given the mass of the Al = mass pf the Pb
The ratio density of the Al and Pb can be represented as:
[tex]\displaystyle \frac{\rho_{Al}}{\rho_{Pb}} } = \frac{m/4\pi r_{Al}^3}{m/4\pi r_{Pb}^3}[/tex]
[tex]\displaystyle \frac{\rho_{Al}}{\rho_{Pb}} } = \frac{ r_{Pb}^3}{r_{Al}^3}[/tex]
[tex]\displaystyle \frac{r_{Al}}{r_{Pb}} =\sqrt[3]{\frac{\rho_{Pb}}{\rho_{Al}} }[/tex]
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how do scientists estimate the age of the universe? they take the distance to a nearby galaxy and divide it by its speed of recession (time
Two methods are used by astronomers to determine the age of the universe: 1) searching for the oldest stars, and 2) calculating the universe's rate of expansion and extrapolating back to the Big Bang.
Just as homicide investigators can determine a bullet's source from the holes it leaves in a wall. to calculate the ages of old, nearby stars and the distance between Earth and numerous galaxies. According to the best calculations of scientists, the universe is 13.8 billion years old. However, we are not totally certain of its age, as we are with so many of the largest-scale characteristics of the cosmos.
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an 800 kg car moving at 4 m/sec to the right strikes a 400 kg car moving to the left. if the cars stick together and stop moving right after the collision, what was the velocity of the 400 kg car?
The answer is 8 m/s to the left. The average speed of the car, according to our research, is four meters per second.
The vector quantity velocity (v), denoted by the equation v = s/t, quantifies displacement (or change in position, s), over change in time (t). Speed (or rate, r) is a scalar number, denoted by the equation
r = d/t,
that quantifies the distance traveled (d) over the change in time (t). All of the elevator's energy (4000 J) will be converted into acceleration if it descends from the top to the bottom at a constant rate of acceleration.
The elevator's 8ms velocity is the answer.
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The switch in the figure has been open for a long time. It is closed at t = 0s.
a. What is the current through the battery immediately after the switch is closed? unit A
b. What is the current through the battery after the switch has been closed a long time? unit A
a. The current through the battery immediately after the switch is closed is 0.5 A .
b. The current through the battery after the switch has been closed a long time is 1 A.
Since the initial resistance offered by the inductor is very strong, the entire current only flows through a single 20 ohm resistance.
Current (I)= [tex]\frac{ 10 V }{20 ohm }[/tex]
I= 0.5 A
After a while, the current stabilizes, and the inductor merely functions as a conducting route. Due to their parallel arrangement, both 20 ohm resistances have an equivalent resistance of [tex]\frac{(20)(20)}{20+20}[/tex], which equals 10 ohm.
Current (I)= [tex]\frac{10V}{10 ohm}[/tex]
I = 1 A
Therefore, the initially the current is 0.5 A and after the switch has been closed for longtime the current is 1 A.
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