22. A man standing on a platform holds weights in his outstretched arms. The system rotates freely about a central vertical axis. If he now draws the weights close to his body, then choose the correct statement. (a) The angular velocity of the system will increase. (b) The angular momentum of the system will increase. (c) The kinetic energy of the system will be conserved. (d) None of the above is correct.
Answers
Answer:
a
Explanation:
the angular velocity of the system will increase
Answer:
The correct statement is as follows:
(a) The angular velocity of the system will increase.
(c) The kinetic energy of the system will be conserved.
Explanation:
What is meant by moment of inertia?
The moment of inertia of a rigid body, also referred to as the mass moment of inertia, angular mass, second moment of mass, or more precisely, rotational inertia, is a property that establishes the torque required for the desired angular acceleration about a rotational axis, much like mass establishes the force required for the desired acceleration. The amount of torque required to change the body's rate of rotation depends on the mass distribution of the body and the axis selected.
The person is using the principle of conservation of angular momentum to contract his hands, reducing his moment of inertia, and increasing his angular velocity.
The angular velocity and kinetic energy are inversely proportional. Additionally, energy would be needed to pull the weights inward from their position.
The correct statement is as follows:
(a) The angular velocity of the system will increase.
(c) The kinetic energy of the system will be conserved.
To learn more about moment of inertia refer to:
https://brainly.in/question/10913508
https://brainly.com/question/14460640
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