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Q.

A mass of 0.1 kg is rotated in a vertical circle using a string of length 20 cm. When the string makes anangle30° with the vertical, the speed of the mass is 1.5ms1 . The tangential acceleration of the mass atthat instant is

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a

2.45ms2

b

19.6ms2

c

4.9ms2

d

9.8ms2

answer is A.

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Detailed Solution

Question Image

at=FLm

=mgsinθm

at=gsinθ

=9.8×12

at=4.9ms2

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A mass of 0.1 kg is rotated in a vertical circle using a string of length 20 cm. When the string makes anangle30° with the vertical, the speed of the mass is 1.5 ms−1 . The tangential acceleration of the mass atthat instant is