8. A uniform beam suspended horizontally as shown is attached to the wall by a s

Question

8. A uniform beam suspended horizontally as shown is attached to the wall by a small hinge. The force exerted by the hinge on the beam has components: A. upward and to the right B. downward and to the right C. upward and to the left D. downward and to the left E. no force is exerted there 9. A person pushes vertically down with a force P on a lever of length L that makes an angle theta with horizontal. The torque produced about the point A is: A. PLsin theta B. PLcos theta C. PL D. 0 10. A weight W swings from a hook in the ceiling by a light string of length L as shown. The tension in the string is T. When the string makes an angle theta with the vertical, the net torque about the hook is: A meter stick is balanced by a 1 kg rock attached at the end of the stick as shown. What is the mass of the meter stick? A. 1.0 kg B. 2.0 kg C. 3.0 kg D. 4.0 kg E. 0.60kg

Explanation / Answer

upward and to the left

optionC

++++++

9)

pLsin(90- theta) = p L costheta

option B

+++++++

option A

+++++++++++

option C

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