Two masses m and are connected at the two ends of a massless rigid rod of length ll. The rod is suspended by a thin wire of torsional constant k at the centre of mass of the rod-mass system (sec figure). Because of torsional constant k, the restoring torque is
=k
for angular displacement 0. If the rod is rotated by
0 and released, the tension in it when it passes through its mean position will be:
a. |
|
b. |
|
c. |
|
d. |
|
Two masses m and are connected at the two ends of a massless rigid rod of length ll. The rod is suspended by a thin wire of torsional constant k at the centre of mass of the rod-mass system (sec figure). Because of torsional constant k, the restoring torque is
=k
for angular displacement 0. If the rod is rotated by
0 and released, the tension in it when it passes through its mean position will be:
a. |
|
b. |
|
c. |
|
d. |
|
=
=
Ω= θ0=average velocity
T=mΩ2r1
T=m Ω2
=m2
=m
=
I= l2=
l2
=
r1=
A copper wire is stretched to make it 0.5% longer. The percentage change in its electrical resistance if its volume remains unchanged is:
a. |
2.5% |
b. |
0.5% |
c. |
1.0% |
d. |
2.0% |
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