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When a disc rotates with uniform angular...

When a disc rotates with uniform angular velocity, which of the following is not true ?

A

a. The sense of rotation remains same.

B

b. The orientation of the axis of rotation remains same.

C

c. The speed of rotation is non-zero and remains same.

D

d. The angular acceleration is non-zero and remains same.

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The correct Answer is:
To solve the question "When a disc rotates with uniform angular velocity, which of the following is not true?", we will analyze each statement provided in the options. ### Step-by-Step Solution: 1. **Understanding Uniform Angular Velocity**: - When a disc rotates with uniform angular velocity, it means that the angular velocity (ω) is constant over time. This implies that there is no change in the rate of rotation. 2. **Analyzing Each Statement**: - **Statement A**: "The sense of rotation remains the same." - This statement is true. Since the angular velocity is uniform, the direction of rotation does not change. - **Statement B**: "The orientation of the axis of rotation remains the same." - This statement is also true. For uniform angular velocity, the axis of rotation does not change its orientation. - **Statement C**: "The speed of rotation is non-zero and remains the same." - This statement is true as well. The speed of rotation, which is related to the angular velocity, is constant and non-zero. - **Statement D**: "The angular acceleration is non-zero and remains the same." - This statement is false. Angular acceleration (α) is defined as the rate of change of angular velocity (dω/dt). Since ω is constant in uniform angular motion, the angular acceleration is zero (α = 0). 3. **Conclusion**: - The statement that is not true is **Statement D**: "The angular acceleration is non-zero and remains the same." ### Final Answer: The statement that is not true is **D**: "The angular acceleration is non-zero and remains the same." ---
To solve the question "When a disc rotates with uniform angular velocity, which of the following is not true?", we will analyze each statement provided in the options. ### Step-by-Step Solution: 1. **Understanding Uniform Angular Velocity**: - When a disc rotates with uniform angular velocity, it means that the angular velocity (ω) is constant over time. This implies that there is no change in the rate of rotation. 2. **Analyzing Each Statement**: ...
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