Simple Harmonic Motion 1 Question 6

6. A linear harmonic oscillator of force constant 2×106N/m and amplitude 0.01m has a total mechanical energy of 160J. Its

(1989,2M)

(a) maximum potential energy is 100J

(b) maximum kinetic energy is 100J

(c) maximum potential energy is 160J

(d) maximum potential energy is zero

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Answer:

Correct Answer: 6. (b,c)

Solution:

  1. 12kA2=12×2×106×(102)2=100J

This is basically the energy of oscillation of the particle.

K,U and E at mean position (x=0) and extreme position (x=±A) are shown in figure.

x=0K=100J= Maximum K=0JU=60J= Minimum U=160J= Maximum E=160J= Constant E=160J= Constant 

Correct options are (b) and (c).



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