Q.
Three masses 700g, 500g, and 400g are suspended at the end of a spring a shown and are in equilibrium. When the 700g mass is removed, the system oscillates with a period of 3 seconds, when the 500 gm mass is also removed, it will oscillate with a period of
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a
1 s
b
2 s
c
3 s
d
125 s
answer is B.
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Detailed Solution
When mass 700 gm is removed, the left out mass (500 + 400) gm oscillates with a period of 3 sec∴3=t=2π(500+400)k …...(i) When 500 gm mass is also removed, the left out mass is 400 gm. ∴t'=2π400k …..(ii)⇒3t'=900400⇒t'=2sec