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The uniform speed of a body is the same as seen from any point in the body. A light cord is wrapped around the rim of the disc and mass of 1 kg is tied to the free end. If it is released from rest,

a)

The tension in the cord is 5N

b)

In the first 4 s the angular displacement of the disc is 40 rad

c)

The work done by the torque on the disc in the first 4 s is 200 J

d)

The increase in kinetic energy of the disc in the first 4 s is 200 J



Question ID - 100712 | SaraNextGen Top Answer

The uniform speed of a body is the same as seen from any point in the body. A light cord is wrapped around the rim of the disc and mass of 1 kg is tied to the free end. If it is released from rest,

a)

The tension in the cord is 5N

b)

In the first 4 s the angular displacement of the disc is 40 rad

c)

The work done by the torque on the disc in the first 4 s is 200 J

d)

The increase in kinetic energy of the disc in the first 4 s is 200 J

1 Answer
127 votes
Answer Key / Explanation : (a,b,c,d) -

(a,b,c,d)

By FBD of particle,

…(i)

By FFD of the disc,

By Eqs. (i) and (ii), we get the following results

1.  and

        and

2. For angular displacement of disc:

rad

3. Work done by torque is

4.

127 votes


127