Consider a bowling ball of mass 8kg which is being held stationary 2m above the

Question

Consider a bowling ball of mass 8kg which is being held stationary 2m above the ground. Which of the following objects does NOT have less potential energy? Another bowling ball (of the same mass) which is being held stationary 1m above the ground Another bowling ball (of the same mass) which is also 2m above the ground but falling downward at 5 m/s strong as it is on earth. A baseball of mass 0.15kg being held at the same height above the ground Another bowling ball (of the same mass) which is being held 2m above the surface of the moon, where the gravity is 1/6th as

Explanation / Answer

1.

potential energy of ball , U = m*g*h = 8*9.8*2 = 156.8 J

(a) U1 = m*g*h1 = 8*9.8*1 = 78.4J < U

(b) U2 = m*g*h = 8*9.8*2 = 156.8J = U

(c) U3 = m*g'*h = 8*(1/6*9.8)*2 = 26.13J <U

(d) U4 = m' *g*h = 0.15*9.8*2 = 2.94J <U

so, option (b) is fullfill the condition.

3.

work done by the man

W = -Fr *d

W = - 55*0.59

W = -32.45 J

Wm = 32.45 J

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