Question

A body rotates with a constant angular velocity of 100 radper sec about a vertical axis the required to sustain this motion will be (A) Zero Nm (B) 100 Nm (C) 200 Nm 0300 SENS 20​

Answer 1

Answer:

B) -- 100 Nm is answer

hope help

Answer 2

Answer:

The net change of doubling angular velocity and halving the moment of inertia is that the rotational kinetic energy becomes twice its initial value.

The correct answer is option C

Explanation:

• An object rotates along a fixed axis at a constant angular velocity. A point P is considered on the body.
• Because the body rotates at a constant angular velocity, point P moves at a constant speed with no linear or tangential acceleration. As a result, speed of P does not change over time.
• When a liquid rotated in a container at a constant angular velocity. It no more acts as a liquid rather it acts as a rigid body.
• In other words we can say that it will have a motion like a rigid body. Hence, we can apply the laws and equations similar to that for the rigid body motion.
• Thus, general pressure variation within the fluid can be represented by the following equation

-∇  p- γ k = ρ a

• Angular Momentum is an axial vector quantity obtained by cross product between position vector and linear momentum vector. Hence it is also known as moment of momentum.
• It can also be calculated by the product of moment of inertia and angular velocity.
• The rotational kinetic energy is directly proportional to the moment of inertia and square of the angular velocity
• If the moment of inertia increases, rotational kinetic energy also increases
• If angular velocity increases, rotational kinetic energy also increases
• If the angular velocity doubles, the rotational kinetic energy will increase by 4 times
• If the moment of inertia becomes half of its initial value, the rotational kinetic energy will become half of its initial value
• So the net change of doubling angular velocity and halving the moment of inertia is that the rotational kinetic energy becomes twice its initial value.

Learn more information about angular velocity

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