1. The kinetic energy of a 2510 kg truck at 42 km/h is closest to ___?
2. A crate is released from the highest point of a 4.00 m long ramp inclined at 60 degrees with the horizontal. The motion is frictionless. What is the speed of the crate at the base of the ramp?
3. The potential energy of a 72 kg student at the second floor, 5.5 m from the ground is __?
4. A worker pushes a wheelbarrow with a force of 180 N making a 25 degree angle with the direction of motion. The work done by the worker on the wheelbarrow is 7140 J. What distance did the worker push the wheelbarrow?
5. An arrow is released from a bow at 62 m/s with a kinetic energy of 103 J. The mass of the arrow is then
6. A constant 38 N net force acts for 1.50 m on a 9.00 kg object initially at rest. What is the object's final speed?
7. A spring with k=15 N/cm is compressed by x=0.075 m. The elastic potential energy stored in the spring is then __?
8. How much work does a 750 W engine do in 18 hours?
9. A 2400 kg pick up truck accelerates, from rest, reaching 60 mph is 45 s. The power delivered by the engine is nearest __ W.
10. An 85 kg student climbs, at a constant speed, a flight of stairs from the ground floor to the first floor, 5.5 m above. The work done by the force of gravity on the student is __ J.
11. A car travels at 15 m/s constant speed. The engine delivers a power of 2730 W. The total force of resistance acting on the car is then __.