You lift a 7.30-kg bowling ball from the storag rack and holdit up to your shoul

Question

You lift a 7.30-kg bowling ball from the storag rack and holdit up to your shoulder. The storag rack is 0.610m above thefloor and you shoulder is 1.12m above the floor. a-When the bowling ball is at your sholder, what is thebowling balls gravitational potential energy relative to thefloor? b- When the bowling ball is at your shoulder, what is itsgravitational potential engery relative to the storage rack? c- How much work was done by gravity as you lifted the ballfrom the rack to shoulder level? You lift a 7.30-kg bowling ball from the storag rack and holdit up to your shoulder. The storag rack is 0.610m above thefloor and you shoulder is 1.12m above the floor. a-When the bowling ball is at your sholder, what is thebowling balls gravitational potential energy relative to thefloor? b- When the bowling ball is at your shoulder, what is itsgravitational potential engery relative to the storage rack? c- How much work was done by gravity as you lifted the ballfrom the rack to shoulder level?

Explanation / Answer

a. PE=mgh=7.3*9.8*1.12=80.124J b. PE=mg(1.12-0.61)=36.48J c. W=PE=-36.48J Hence we get by it.

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