Kinematics Question 726

Question: The length of second’s hand in a watch is 1 cm. The change in velocity of it’s tip in 15 seconds is[MP PMT 1987, 2003]

Options:

A) Zero

B)π302cm/sec

C) π30cm/sec

D)π230cm/sec

Show Answer

Answer:

Correct Answer: D

Solution:

In 15 second’s hand rotate through90 .

Change in velocity |Δv|=2vsin(θ/2)

=2(rω)sin(90/2)

=2×1×2πT×12

=4π602=π230cmsec [As T = 60 sec]



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