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Conservation of Mechanical Energy and Power — Homework
Decide first whether a problem is a conservation-of-energy question or a power question.
- 1.A ball starts from rest at the top of a frictionless ramp 90 m high. Find its speed at the bottom.
- 2.A pump does 2400 J of work in 8 s. Find its power output.
- 3.A tow motor exerts a constant 150 N force on a boat moving at a constant 4 m/s. Find the motor's power output.
- 4.Explain why mass cancels out of the formula v = sqrt(2*g*h) for an object sliding down a frictionless ramp from rest.
- 5.Two elevators lift the same 800 kg load to the same height, but one takes twice as long as the other. Compare the work done and the power used by each.
- 6.Describe a real machine or activity where power (not just total work) is the important design consideration, and explain why.
🌲 Homeschool of the FutureEleventh Grade · Science · week 17 homework