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Posted by on Sunday, December 8, 2013 at 1:31pm.

A ruler stands vertically against a wall. It is given a tiny impulse at θ=0∘ such that it starts falling down under the influence of gravity. You can consider that the initial angular velocity is very small so that ω(θ=0∘)=0. The ruler has mass m= 200 g and length l= 20 cm. Use g=10 m/s2 for the gravitational acceleration, and the ruler has a uniform mass distribution. Note that there is no friction whatsoever in this problem.

W = 4.48

What is the force exerted by the wall on the ruler when it is at an angle θ=30∘? Express your answer as the x component Fx and the y component Fy (in Newton)

Please help

  • PHYSICS URGENT DR BOB - , Sunday, December 8, 2013 at 9:26pm

    apply conservation of energy:
    EK= 1/2*I*w^2, I=1/3*m*L^2

    Eini= mg(L/2) + 0
    Efin= mg(L/2)cos30 + 1/2*I*w^2
    solve for Eini=Efin -> w=

    any one knows how to answer the other questions?

  • PHYSICS URGENT DR BOB - , Monday, December 9, 2013 at 5:51am

    moment of inertia about cg rather than about end is (1/12)mL^2

  • PHYSICS URGENT DR BOB - , Monday, December 9, 2013 at 9:21am

    following those equations I got a green mark for A.

    But any idea about how b and c can be done?

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