Need help with physics HW

12. How much work is done by the boy pulling his sister 30.0 m in a wagon as shown to the right? Assume no friction acts on the wagon. F (50 H) 150 4-30 OO 13, Calculate the work done by an 85.0-kg man who pushes a crate 4.00 m up along a ramp that makes an angle of 20.0" with the horizontal as shown to the right. He exerts a force of 500 N on the crate parallel to the ramp and moves at a constant speed. Be certain to include the work he does on the crate and on his body to get up the ramp. 14. Joey applies 10 N of force over 3 m in 10 s. Adam applies the same force over the same distance in 1 minute. a. Who did more work? Explain. b. Who used more power? Explain 15. Joey performed 12 J of work in 10 seconds. Adam did 6 J of work in 5 seconds. a. Who did more work? Explain b. Who used more power? Explain 16. A large household air conditioner may consume 15.0 kW of power. What is the cost of operating this air conditioner 3.00 h per day for 30.0.d if the cost of electricity is $0.110 per k Wh? 17. A 500-kg dragster accelerates from rest to a final speed of 110 m/'s in 400 m (about a quarter of a mile) and encounters an average frictional force of 1200 N. What is its average power output in watts and horsepower (1 hp - 746 W) if this takes 7.30 s