Question
Question: The at wood machine shown is suspended from a spring balance. The mass on one hanger is M, that on o...
The at wood machine shown is suspended from a spring balance. The mass on one hanger is M, that on other is (M + m). Suppose the heavier side (right side) hanger is fastened to the top of pulley by a thread. The scale reads (2M + m)g. The thread is burned and the system accelerates. The reading of spring balance now will be –
A
Same as before
B
More than before
C
Less than before
D
Can't say
Answer
Less than before
Explanation
Solution
F.B.D of whole system :
(2M + m) g – Fs = (2 M + m) acm
Fs < (2M + m) g