Question

Compute the power output of a machine that lifts a 500 kg crate through a height of 20 m in a time of 60 s. 2. A waterfall is 30 m high and 20,000 kg of water flows over it per second. (a) How much power does this flow represent? (b) If all this power could be converted to electricity, how many 25 W light bulbs could be supplied? 3. A girl in a park starts to slide from rest at the top of a slide 15 m high. (a) What is her speed at the bottom of the slide if the incline is frictionless? (b) What amount of energy is lost if her speed at the bottom is 8 m/s? 4. A 0.25 hp motor is used to lift a load at a rate of 5 cm/s. How great a load (in kg) can it lift at constant speed? 5. 1000 J of energy are imparted to a 0.25 kg ball initially at rest. If all the energy is used to produce kinetic energy of the ball, what is the final speed of the ball?

          Compute the power output of a machine that lifts a 500 kg crate through a height of 20 m in a time of 60 s.

2. A waterfall is 30 m high and 20,000 kg of water flows over it per second. (a) How much power does this flow represent? (b) If all this power could be converted to electricity, how many 25 W light bulbs could be supplied?

3. A girl in a park starts to slide from rest at the top of a slide 15 m high. (a) What is her speed at the bottom of the slide if the incline is frictionless? (b) What amount of energy is lost if her speed at the bottom is 8 m/s?

4. A 0.25 hp motor is used to lift a load at a rate of 5 cm/s. How great a load (in kg) can it lift at constant speed?

5. 1000 J of energy are imparted to a 0.25 kg ball initially at rest. If all the energy is used to produce kinetic energy of the ball, what is the final speed of the ball?

Added by Ashley E.

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