A disc of radius 10cm is rotating about the central axis perpendicular – McqOptions

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1.	A disc of radius 10cm is rotating about the central axis perpendicular to its plane. A force of 5N acts on it tangentially. The disc was initially at rest. Calculate the value of power supplied by the force when the disc has rotated by 30 .The mass of the disc is 2kg.
A.	1.28W
B.	1.8W
C.	3.9W
D.	2.63W
Answer» C. 3.9W

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