Question: A level platform vibrates horizontally with simple harmonic motion with a period of 0.8 s. (a) A box on the platform starts to slide when

A level platform vibrates horizontally with simple harmonic motion with a period of 0.8 s.

(a) A box on the platform starts to slide when the amplitude of vibration reaches 40 cm; what is the coefficient of static friction between the body and the platform?

(b) If the coefficient of friction between the box and platform were 0.40, what would be the maximum amplitude of vibration before the box would slip?

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