King Zog and Queen Geraldine are fishing from a bridge and they catch identical

Question

King Zog and Queen Geraldine are fishing from a bridge and they catch identical twin fish, each with mass 5.0 kg. They hoist the fish to the bridge 8.0 m about the water. Zog takes 10 s to hoist his fish and Geraldine 7.5 s to hoist her fish.

a) Which of the following is true? Explain your answer.

i) Zog and Geraldine do the same work.

ii) Zog does more work than Geraldine.

iii) Zog does less work than Geraldine.

b) Which of the following is true? Explain your answer.

i) Zog and Geraldine expend the same power.

ii) Zog expends less power.

iii) Zog expends more power.

Explanation / Answer

Here ,

as the work done in lifting the fish = mgh

as the mass of fishes is same,

Hence,

a)

i) Zog and Geraldine do the same work.

b)

now ,as power = work done/time

as the work done is same for both but Zog takes more time than Geraldine

hence, power of Zog is less

ii) Zog expends less power.

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