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particle of mass 1 kg1 kg is hanging from a spring of force constant 100 N m−1.100 N m-1. The mass is pulled slightly downward and released so that it executes free simple harmonic motion with time period T.𝑇. The minimum time when the kinetic energy and potential energy of the system will become equal, is Tn.𝑇𝑛. The value of n𝑛 is _______

Question

particle of mass 1 kg1 kg is hanging from a spring of force constant 100 N m−1.100 N m-1. The mass is pulled slightly downward and released so that it executes free simple harmonic motion with time period T.𝑇. The minimum time when the kinetic energy and potential energy of the system will become equal, is Tn.𝑇𝑛. The value of n𝑛 is _______

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Solution

In simple harmonic motion, the total energy of the system is the sum of kinetic energy and potential energy. The total energy remains constant throughout the motion.

The kinetic energy (K.E.) and potential energy (P.E.) are equal when the displacement is at 1/√2 of the amplitude.

The time period of the motion is given by T = 2π√(m/k), where m is the mass and k is the spring constant.

In this case, m = 1 kg and k = 100 N/m. So, T = 2π√(1/100) = 2π/10 = π/5 s.

The time taken to reach a displacement of 1/√2 of the amplitude is a quarter of the time period (as it is a quarter of the way through the cycle).

So, the minimum time when the kinetic energy and potential energy of the system will become equal is T/4 = (π/5)/4 = π/20 s.

Therefore, n = 20.

This problem has been solved

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