Refer to Example Problem 1 to solve the following problem. a. If the hockey play

Question

Refer to Example Problem 1 to solve the following problem. a. If the hockey player exerted twice as much force, 9.00 N, on the puck, how would th puck's change in kinetic energy be affected? b. If the player exerted a 9.00-N force, but the stick was in contact with the puck for only half the distance, 0.075 m, what would be the change in kinetic energy? Together, two students exert a force of 825 N in pushing a car a distance of 35 m. a. How much work do the students do on the car? b. If the force was doubled, how much work would they do pushing the car the same distance? 3. A rock climber wears a 7.5-kg backpack while scaling a cliff. After 30.0 min, the climb is 8.2 m above the starting point a. How much work does the climber do on the backpack? b. If the climber weighs 645 N, how much work does she do lifting herself and the backpack? c. What is the change in the climber's energy?

Explanation / Answer

2)a) Work done = Force * distance

= 825*35 = 28875 J

b) if the force is doubled , work done = 2F*s = 2*28875 = 57750 J

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