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 |
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 |
(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.