alleryA wheel spins at 10 rad/s. What is the speed of a point 0.3 m from the axis?
- 3 m/s
- 33 m/s
- 0.03 m/s
- 30 m/s
Show answer and solution
Correct answer: A. 3 m/s
Linear speed v = ωr = 10 x 0.3 = 3 m/s.
NEET UG System of Particles and Rotational Motion — practice questions — page 4
Explore 139 free System of Particles and Rotational Motion questions in NEET UG Physics. Open each question or exercise to read its content, reference answers and available explanation.
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A wheel spins at 10 rad/s. What is the speed of a point 0.3 m from the axis?Read the answer and worked solution →Pure rotation of a rigid body means all its parts have the sameRead the answer and worked solution →For rotation about a fixed axis, the angular velocity vector liesRead the answer and worked solution →The linear velocity of a particle of a rotating rigid body is given byRead the answer and worked solution →Rotation of a rigid body about a fixed axis needs how many independent variables?Read the answer and worked solution →A wheel starts from rest with angular acceleration 2 rad/s^2. What is its angular speed after 5 s?Read the answer and worked solution →A disc starts from rest and speeds up at 2 rad/s^2. Through what angle does it turn in 5 s?Read the answer and worked solution →A rotor at 4 rad/s gains speed uniformly at 2 rad/s^2 over 5 rad. Its final angular speed isRead the answer and worked solution →A motor wheel goes from 1200 rpm to 3120 rpm uniformly in 16 s. What is its angular acceleration?Read the answer and worked solution →A wheel turns at 1200 revolutions per minute. Its angular speed in rad/s isRead the answer and worked solution →A net torque of 20 N m acts on a body with I = 4 kg m^2. Its angular acceleration isRead the answer and worked solution →A flywheel with I = 2 kg m^2 spins at 4 rad/s. What is its rotational kinetic energy?Read the answer and worked solution →A body with I = 2 kg m^2 rotates at 3 rad/s about a symmetry axis. Its angular momentum isRead the answer and worked solution →A shaft carries a torque of 10 N m while turning at 5 rad/s. What power does it deliver?Read the answer and worked solution →A constant torque of 5 N m turns a wheel through 4 rad. How much work is done?Read the answer and worked solution →For a fixed axis, angular acceleration of a rigid body isRead the answer and worked solution →In fixed axis rotation, which forces can be left out of the torque sum?Read the answer and worked solution →Work done by external torques on a perfectly rigid body goes intoRead the answer and worked solution →The rate of change of angular momentum of a particle equals theRead the answer and worked solution →Angular momentum of a particle about O is zero if its momentum lineRead the answer and worked solution →A 2 kg particle moves at 3 m/s along a line 4 m from point O. Its angular momentum about O isRead the answer and worked solution →A free particle moves in a straight line at constant velocity. Its angular momentum about a fixed pointRead the answer and worked solution →Total angular momentum of a system is conserved when the total externalRead the answer and worked solution →Internal torques cancel if forces obey Newton's third law and also actRead the answer and worked solution →A turntable with I = 4 kg m^2 spins at 3 rad/s. With no external torque, I falls to 2 kg m^2. New ω?Read the answer and worked solution →You spin on a free swivel chair and stretch out your arms. Result?Read the answer and worked solution →A diver curls into a tuck in mid air. Why does the diver spin faster?Read the answer and worked solution →A skater pulls in her arms while spinning freely. Her rotational kinetic energyRead the answer and worked solution →Which everyday action applies a couple?Read the answer and worked solution →Why does a compass needle turn in the Earth's magnetic field without moving off?Read the answer and worked solution →
Worked practice questions
Pure rotation of a rigid body means all its parts have the same
- angular velocity
- linear acceleration
- kinetic energy
- linear velocity
Show answer and solution
Correct answer: A. angular velocity
In pure rotation every particle turns through the same angle per unit time, so all share one angular velocity.
For rotation about a fixed axis, the angular velocity vector lies
- in the plane of rotation
- along the radius vector
- along the circle tangent
- along the axis of rotation
Show answer and solution
Correct answer: D. along the axis of rotation
The angular velocity vector points along the axis, in the direction a right handed screw would advance.
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