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25. When a disc rotates with uniform angularvelocity, which of the following is not true?(a) The sense of rotation remains same.(b) The orientation of the axis of rotationremains same.(c) The speed of rotation is non-zero andremains same.(d) The angular acceleration is non-zero and |
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Answer» The rate of change of angular velocity is defined as angular acceleration. If particle has angular velocityω1at timt1, and angular velocity ω2at time t2, thenAngular acceleration α = ω2– ω1/ t2– t1 When the disc is rotated with constant angular velocity, angular acceleration of the disc is zero. Because we know that angular accelerationα = ∆ ω/∆ tHere ω is constant, so ∆ ω = 0 |
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