First slide

Potential energy

Question

A uniform chain of length 4m and mass 4 kg is placed on a smooth table with one-fourth of its length hanging over the edge. The work that has to be done to pull the whole chain back onto the table is

Easy

A

5 J
B

2.5 J
C

7.5 J
D

10 J

Solution

m = Mass of the hanging part $= \frac{4 \times 1}{4} k g = 1 k g$
Displacement of c.g. h = 0.5 m
work done $= m g h = 1 \times 10 \times 0.5 J = 5 J$

Get Instant Solutions

When in doubt download our app. Now available Google Play Store- Doubts App

Recieve an sms with download link

Doubts App

OR

SCAN ME

Doubts App

Doubts App