1) A boy and a girl are balanced on a massless seesaw. The boy has a mass of 60

Question

1) A boy and a girl are balanced on a massless seesaw. The boy has a mass of 60 kg and the girl’s mass is 50 kg. If the boy sits 1.2 m from the pivot point on one side of the seesaw, where must the girl sit on the other side for the equilibrium?

2) Hook’s law relates elastic force to stretch (F=-kx) and Young’s modulus (Y) relates stress to strain. For a wire stretching under a load, express the constant k in terms of Y, wire length L, and area A:

3) In a simple Harmonic Oscillator, the velocity is greatest at:

A) Maximum Acceleration

B) Minimum Acceleration

C) Maximum Displacement

D) Maximum Stored Energy

E) Maximum Force

Explanation / Answer

a) torque about pivot should balance

=> m1g*r1 = m2g*r2

=> 60*1.2 = 50*r2

=> r2 = 1.44 m from pivot

b) k = AY/L

c) B) Minimum Acceleration

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