Besides we must assume that mr. An electric machine makes use of 300 j of energy to do work in 10s.
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The unit for standard metric work is the joule and the standard metric unit for time is the second so the standard metric unit for power is a joule second defined as a watt and abbreviated w.
Power formula physics examples. P w t. The total energy associated with a wavelength is the sum of the potential energy and the kinetic energy. The standard metric unit of power is the watt.
Examples for power. Solved examples on power formula. Answer we can find out the power which we require from the battery by applying the electric power formula.
Power of a body is defined as the rate at which the body can do the work. The unit of the power from the equation given above joule s however we generally use the unit of power as watt. Example find the power of the man who pushes the box 8m with a force of 15n in a 6seconds.
P 19000 w p 19 kw the power required to raise the elevator was 19000 watts which is equal to 19 kw. The formula for power is mentioned below. Or p e t w t is the required power formula here w work t time and e is the energy consumed to do the work.
How much power does it use. Also in this case then we could calculate mr. P 12 0 v 0 9 a p 12 0 j c 0 9 c s p 10 8 j s.
Which is related to how fast a job is done. X elevates his body of 80 kg up by a 2 0 meter stairwell in 1 8 seconds. Thus the power of a machine is the work time ratio for that particular machine.
Therefore the power which the battery requires of the mobile phone is 10 8 w. The power can be found using the formula. Thus we will have.
The power rating relates to how rapidly the car can accelerate the car. Power work time. Work done w 300 j time taken t 10 s.
A car engine is an example of a machine that is given a power rating. X must apply an 800 newton downward force upon the stairs to elevate his body. The power formula is used to compute the power resistance voltage or current in any electrical circuit.
Eλ uλ kλ 1 4μa2ω2λ 1 4μa2ω2λ 1 2μa2ω2λ. Suppose that a 40 horsepower engine could accelerate the car from 0 mi hr to 60 mi hr in 16 seconds. P 10 8 w.
The power of the man is 20 watt. For more physics formulas vist main page and do solve exercise of ncert from entrancei ncert solutions for class 11 physics and ncert solutions for class 12 physics.
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