Q.

Consider the system shown in fig. The pulley and the string are light and all the surfaces are frictionless. The tension in the string is (take g = 10 m/s2)

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a

0 N

b

1 N

c

2 N

d

5 N

answer is D.

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Detailed Solution

See fig.From figure, 1g -T = 1 a and T = 1 aFrom eqs. (1) and (2), we get1g-1,a=1a or 2a=g∴a=(g/2)=(10/2)=5m/s2So, T=ma=1x 5=5N.
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Consider the system shown in fig. The pulley and the string are light and all the surfaces are frictionless. The tension in the string is (take g = 10 m/s2)