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Question-1. What is torsional pendulum?
Answer-1: A body suspended from a rigid support by means of a long and thin elastic wire is called torsional pendulum.
Question-2. What is the type of oscillation?
Answer-2: This is of simple harmonic oscillation type.
Question-3. On what factors does the time period?
Answer-3: It depends upon:
1. Moment of inertia of the body
2. Rigidity of wire i.e., length, radius and material of the wire.
Question-4. How will you determine the rigidity of fluids?
Answer-4: As fluids do not have a shape of their own, hence they do not posses rigidity. Hence there is no question of determining.
Question-5. Define time period
Answer-5: Time taken for one complete oscillation.
Question-6. Define Rigidity of modulus
Answer-6: When tangential surface forces are applied on a body ,the successive layers of the material are moved or sheared. This type of strain is called shearing strain. ?the ratio of tangential stress to shearing strain is called Rigidity of modulus? i.e.
Rigidity of modulus = Tangential Stress / shearing Strain
Tangential Stress = Force/ Area
Shearing Strain = θ
Question-7. Define Moment of Inertia?
Answer-7: It is the measure of the inertia of a body in rotator motion. It depends upon the axis of rotation ,mass of the body and also on the distribution of the mass about the axis.
Question-8. What is the meaning in calling this a pendulum?
Answer-8: The disk is making oscillations around a vertical axis passing through its centre of mass and hence the arrangement is called a torsional pendulum.
Question-9. Difference between simple pendulum and torsional pendulum?
Answer-9: In a simple pendulumthe simple harmonic motion is due to the restoring force which is the component of the weight of the bob. In a torsional pendulum the simple harmonic motion is due to restoring couple araising out of torsion and shearing strain.
Question-10. What is S.H.M.?
Answer-10: A body is said to have a S.H.M. ,if its acceleration is always directed towards a fixed point on its path and is proportional to its displacement from the fixed point.
Question-11. What is Young's modulus?
Answer-11: It is the ratio of longitudinal stress to the longitudinal strain.
Question-12. What is restoring force (net force) acting on the bob?
Answer-12: If the air friction is neglected, restoring force on the bob = mg Sin θ.
Question-13. What is net force on the bob, at equilibrium (mean) position?
Answer-13: Zero, since at mean position the weight of the bob is perfectly balanced by the tension (T) in the string.
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