Question

OBJECTIVE PHYSICS IA
A bucket filled with water weighing 20 kg is raised from a well of depth 20m. If the linear density of
the rope is 0.2kg per meter, the amount of work done is, (g = 10ms) (in J)
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Answer 1

Answer:

Work done = q * potential difference

q = linear charge density *length.

Put values...

Hope it works out....

Answer 2

Weight of bucket + Rope of length x=m=20+0.2x

Work done in raising the rope+bucket by depth dx=dW=mg(dx)

Integrating both sides from x=0m to x=20m

⇒W=∫$_{0}$²⁰

(20+0.2x)(10)(dx)

⇒W=4000+400=4400J

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