Work, Energy, and Power Test Review

Can you help him find the coefficient of friction ps

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Can you help him find the coefficient of friction? PS: He forgot the mass of the car and doesn’t know his mass either! µ=0.92 5) A ball is dropped from rest and it collides with a spring which brings it to rest over a distance of 0.15 m. The ball was originally 1.2 m above the spring whose constant is 350 Nm. What is the mass of the ball? 0.298 kg (BE CAREFUL ON THIS ONE WHERE YOU DEFINE H=0) 6) A mover uses a dolly (mass 8 kg) to move a large box (100 kg) up a 20 m long incline which is angled at 10° in 8 s. Assume box starts and ends at rest. a) How much work does the mover do? 3,675.8 J b) What is the change in gravitational potential energy? 3,675.8 J c) What is the mover’s power output? 459.5 W 7) How can you get the work done on an object by looking at a Force vs. Distance graph?
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8) A horizontal spring shoots a 3kg box along a horizontal frictionless surface. The box then goes up a hill inclined at 32º and the hill has a coefficient of kinetic friction of 0.3. The box travels 50m along the inline before stopping. If the spring constant for the spring is 780N/m, how far is the spring initially
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Can you help him find the coefficient of friction PS He...

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