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Q|C An object of mass m moves in simple harmonic motion with amplitude 12.0cm on a light spring. Its maximum acceleration is 108cm /s² . Regard m as a variable. (d) Find the total energy E of the object-spring system.

Sagot :

The total energy E of the object-spring system is 0.0648m Joules

We know that,

The total energy E = 1/2 * Mass m * Angular frequency ω * Amplitude A

The maximum acceleration a = [tex]w^{2}[/tex] * Amplitude A

Given,

Amplitude A = 12cm

The maximum acceleration a = 108 cm/s2

a = [tex]w^{2}[/tex] * A

108 = [tex]w^{2}[/tex] * 12

ω = 3 [tex]s^{-1}[/tex]

The Energy needs to be in Joules. So,

Joules = kg * [tex]m^{2}[/tex] / [tex]s^{2}[/tex]

ω * A = 36 cm / s = 0.1296 [tex]m^{2}[/tex] / [tex]s^{2}[/tex]

E = ½ * m * 0.1296

E = 0.0648m Joules (where m is in Kg).

The total energy E of the object-spring system is the sum of potential energy and kinetic energy.

Therefore the total energy E of the object-spring system is 0.0648m Joules

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