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Two blocks of masses m1 and m2, which ar...


Two blocks of masses `m_1` and `m_2`, which are connected with a light string, are placed over a friction less pulley. This set up is placed over a weighing machine, as shown. Three combination of masses `m_1` and `m_2` are used, in first case `m_1=6kg` and `m_2=2kg`, in second case `m_1=5kg` and `m_2=3kg` and in third case `m_1=4kg` and `m_2=4kg.` masses are held stationary initially and then released if the readings of the weighing machine after the release in three cases are `W_1`,`W_2` and `W_3` respectively then:

A

`W_1gtW_2gtW_3`

B

`W_1ltW_2ltW_3`

C

`W_1=W_2=W_3`

D

`W_1=W_2ltW_3`

Text Solution

Verified by Experts

The correct Answer is:
B

Reading of the weighing machine`=2T+` weight of the machine.
As weight of the machine is constant.
`T=(2m_1m_2)/(m_1+m_2)`
So reading is maximum for the case `m_1m_2` is maximum as `m_1+m_2` in all cases is same.
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