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Q.

A long rubber tube having mass 0.9 kg is fastened to a fixed support and the free end of the tube is attached to a cord which passes over a pulley and supports an object, with a mass of 5 kg as shown in fig. If the tube is struck by a transverse blow at one end, the time required for the pulse to reach the other end is (linear density of tube =49625 kg/m )

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a

4.7s

b

5s

c

3.2s

d

0.47s

answer is B.

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Detailed Solution

Tension in the string is 

T = 5kg x 9.8m/s2 = 49N.

we know, velocity of the pulse is 

V=Tμ=4949625=25m/s

 t=dV⇒t=1225=0.476

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