Work And Energy Test

Result

Work And Energy Test - 8

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Weekly Quiz Competition

Question 1
1 / -0

A uniform chain of length 1 m is kept on a table, such that a length of 60 cm hangs freely from the edge of the table. The total mass of the chain is 4 kg. What is the work done in pulling the entire chain onto the table?

A
3.6 J

B
7.2 J

C
120 J

D
1200 J

Solution

Mass of 0.60 m length of chain = 0.6 × 4 = 2.4 kg
Force on freely hanging chain, F = mg = 2.4 × 10 = 24 N
Distance through which the centre of mass is to move = 0.3 m
Work done = F × d = 24 × 0.3 = 7.2 J