Find the force required to barely lift one end of the 5.0m long, 100 kg log. Not

Question

Find the force required to barely lift one end of the 5.0m long, 100 kg log. Note that when we lift one end of the log the normal force from the ground acts at the other end which is still on the ground. Note as well that 'barely lift' means the object is still in rotational equilibrium. (490 N) Find the force required to do a sit up. Assume the upper body has a weight of 400 N. The 1.20 cm to the muscle insertion and represents the distance between where the muscle is attached to the bone and where the bones pivot. (18 300 N) Find the net torque on the bicycle crank below if the rider pushes on the pedals with 330. N of force and there is 120. N of tension in the upper chain. Distances are shown on a second diagram for clarity. (86 6 Nm CW) A pendulum bob is suspended from the celling and pulled with a horizontal force of 2 N so that its cold makes an angle of 30 with the vertical. What is the tension in the pendulum cord? (4 N)

Explanation / Answer

Conserving Torque about the end of the rod

F(5) = 100*9.8(2.5)
F =  490N

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