The angular acceleration of second hand of watch is
Correct answer: D. None of the above
- A. π rad/sec2
- B. 2π rad/sec2
- C. π/2 rad/sec2
- D. None of the above
Explanation
Angular acceleration (α) is defined as the change in angular velocity (ꞷ) per unit time. The second-hand watch as a constant angular velocity of rad/s. Therefore, change in (ꞷ) will be zero and α will be zero as well. Option A, B and C are all hence wrong.
This question appeared on the ETEA MDCAT 2019 paper, which you can sit online with every answer explained.
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About Angular Velocity
Angular velocity describes how quickly angular displacement changes with time, with ω = Δθ/Δt and units of radians per second. Questions relate angular and linear motion through v = rω, use the direction given by the right hand rule, and distinguish angular velocity from angular acceleration and ordinary frequency.
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