Sound WavesHard
Question
A wire of 9.8 × 10-3 kgm-3 passes over a frictionless light pulley fixed on the top of a frictionless inclined plane which makes an angle of 30o with the horizontal. Masses m and M are tied at the two ends of wire such that m rests on the plane and M hangs freely vertically downwards. The entire system is in equilibrium and a transverse wave propagates along the wire with a velocity of 100 ms-1. Choose the correct option :-
Options
A.m = 20 kg
B.m = 5 kg
C.m = 2kg
D.m = 7 kg
Solution
v =
⇒ T = V2 μ = 98 NFor equilibrium Mg = mg sin 30 = T
Now mg sin 30o = T = 98 N
m = 20 kg
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