NEET Class neet Answered
Time period of a pendulum in air is T , it is submerged in a liquid. Such that relative density of material of bob is 4 .find the time period in liquid ?
Asked by brijk456 | 16 Aug, 2019, 11:16: AM
Expert Answer
Let m is mass of bob. Its weight when immersed in liquid = mg - (m/4)g = mg(3/4)
hence effective acceleration due to gravity g ' = (3/4)g
Time period in air, T = 2π ( L/g )1/2 ..................(1)
Time period in air, T ' = 2π ( L/g' )1/2 ..................(2)
Hence ( T ' / T ) = (g/g')1/2 = [ g / (3g/4) ]1/2 or T ' = T (4/3)1/2 = 1.155 T
Answered by Thiyagarajan K | 16 Aug, 2019, 12:17: PM
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