Work, Energy, and Power
Which of the following scenarios best exemplifies the concept of power as the rate of energy transfer?
A 10 kg block is pushed up an inclined plane. The block's kinetic energy increases by 200 J and its potential energy increases by 300 J in 5 seconds. Assuming no friction, what is the average power exerted on the block?
A machine lifts a 50 kg object vertically at a constant speed of 2 m/s. If there is a constant friction force of 100 N opposing the motion, what is the average power that the machine must supply?
A force of 50 N is applied to move an object 10 meters in 5 seconds. Calculate the average power.
A car exerts a force of 2000 N while traveling at a constant velocity of 15 m/s. What is the instantaneous power?
A person pushes a box with a force of 100 N at an angle of 60 degrees to the horizontal. The box moves at a constant speed of 2 m/s. What is the instantaneous power?
A machine performs 200 J of work in 4 seconds. What is the average power of the machine?
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A motor does 600 J of work to lift a block in 3 seconds. What is the average power developed by the motor?
A 5 kg block is lifted vertically from rest by a non-constant force. It reaches a height of 4 meters with a speed of 3 m/s in 2 seconds. What is the average power exerted during this lift?
A lightbulb converts 600 Joules of electrical energy into light and heat energy in 10 seconds. What is the average power of the lightbulb?