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Main » Power » Online Activity II_2_1

Power - Online Actvity II.2.1

Power Problems   Include units when entering answers. Ex: for Watts use W or meters per second use m/s.

 1 A 40 kg bail of hay was lifted vertically 1.2m to the back of a truck in 2s. How much work was done?    What was the rate at which the work was done?
 2 A 40 kg bail of hay was pushed up a ramp to the back of a truck which is 1.2 m high. It took the farmer 3.0s to complete this task. How much work was done?    What was the rate, in watts, at which the work was done?    In horsepower?
 3 How much power does a forklift develop doing 5400 J of work in 2.0 min?
 4 How much power is developed by a 65 kg student running up a 4.0 m high flight of stairs in 2.4s?

 5 A physics student who can generate 625 W runs up a flight of stairs in 5.5s. If the student has a mass of 59 kg, how high are the stairs?

 6 If an elevator has a mass of 1500 kg and its motor can produce 2500 W of power, at what constant speed will the elevator rise?