Accelerate NEET 2020: Rotational Motion Class 2 (07.09.2019)

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Question 1

A body rolls down an inclined plane without slipping. The fraction of total energy associated with its rotation will be

• A(k² + R²)
• B
• C
• D

Question 2

Calculate radius of gyration of a cylindrical rod of mass m and length L about an axis of rotation perpendicular to its length and passing through the centre.

• A
• B
• C
• D

Question 3

Two rotating bodies A and B of masses m and 2m with moments of inertia I_A and I_B(I_B > I_A) have equal kinetic energy of rotation. If L_A and L_B be their angular momenta respectively, then

• AL_A =L_B/2
• BL_A =2L_B
• CL_B > L_A
• DL_A > L_B

Question 4

Two discs of same moment of inertia rotating about their regular axis passing through centre and perpendicular to the plane of disc with angular velocities and . They are brought into contact face to face coinciding the axis of rotation. The expression for loss of energy during this process is:-

• A
• B
• C
• D

Question 5

A rope is wound around a hollow cylinder of mass 3 kg and radius 40 cm. What is the angular acceleration of the cylinder if the rope is pulled with a force of 30 N?

• A0.25 rad/s²
• B25 rad/s²
• C5 m/s²
• D25 m/s²

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