Q No: 1 Circle the correct answer. 08 1. ...
Q No: 1 Circle the correct answer. 08
1.
Moment of inertia is equal
to:
a)
𝑚2 𝑟
b) 𝑚2
𝑟2
c) 𝑚
𝑟
d) 𝑚
𝑟2
2.
The period of a circular
motion is given by.
a)
T = rV ww b) T = wp c) T = 2 w/p d) T = 2p/w
3.
One radian is equal to.
a)
67.3o b) 57.3o c) 87.3o
d) 60o
4.
The rotational K.E of a
body is given by:
a)
1/2 𝐼𝜔3 b) 1/3 𝐼𝜔2
c) 𝜔2
d)
1/2 𝐼𝜔2
5.
The apparent weight of a
man in a lift moving down with an acceleration of 9.8 𝑚 𝑠-2
is:
a)
Zero b)
9.8 N c)
19.6 N d)
Infinity
6.
The minimum number of
communication satellites required to cover the whole earth is:
a)
4 b)
3 c)
2 d)
5
7.
Geo-stationary satellite
completes one rotation around earth in.
a)
3 hours b)
6 hours c) 12
hours d) 24 hours
8.
The critical speed of an
artificial satellite is.
a)
6 Kms-1 b) 8.1 Kms-1 c) 7.9 Kms-1 d) 8 ms-1
Short Questions: 2×7=14
1.
What is meant by moment of
inertia? Explain its significance.
2.
What is meant by angular
momentum? Explain the law of conservation of angular momentum.
3.
Describe what should be the
minimum velocity, for a satellite, to orbit close to earth around it?
4.
When mud flies off the tyre
of a moving bicycle, in what direction does it fly? Explain.
5.
Explain how many minimum
number of geo-stationary satellites are required for global coverage of TV
transmission.
6.
Why a diver does changes
its body position before and after diving in the pool?
7.
Show that orbital angular
momentum. Lo=mvro
Long Questions: 08
1.
What is
meant by rotational kinetic energy? Find the velocity of hoop and disc.
2.
What is
meant by geostationary satellite? Find the orbit of geostationary satellite.
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