Physics
JAMB 2007
A gramophone record takes 5s to reach its constant angular velocity of 4\(\pi\) rads
-1 from rest. Find its constant angular acceleration.
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A.
0.4\(\pi\) rads-2
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B.
0.8\(\pi\) rads-2
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C.
1.3\(\pi\) rads-2
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D.
20.0\(\pi\) rads-2
Correct Answer: Option B
Explanation
From the radiation:
V = +at, and if it starts from N & T, U = 0
And for angular motion, W = O + at
4R = aχ5
∴ a = (4a)/5 = 0. 8\(\pi\) rads
-2
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