Summary: Physics 201, Exam 3 Name itt Oil
The multiple-choice problems carry no partial credit.
=> Circle ALL the correct answers. <
But in the work-out problems, you are graded on your work, with partial credit.
Be sure to include the correct units in the answers, and give your work in the space provided.
Moments of inertia: I = MR2 for single point mass, I = MR2 for solid sphere,
I ---MR for solid disc or cylinder, I = MR for hollow disc or cylinder,
i = ! for thin plate rotating about one edge (L = length ofother edge which is perpendicular to axis ofrotation)
1. (5) A uniform beam is suspended horizontally as shown in the figure below. It is attached to the wall by a
small hinge. I t H - H, L' e ifJi C) `t
Mt5 o f 5o
i- ; ri-R..The force that the hinge exerts on the beam has components
(a) upward and to the right 1 i 1Je r mIn eli V n W
(b) upward and to the left ` .=. w (-f -zf- ues to_bi/iiiiee) Cnier ol
y&d and to the right
T)ieh i--L W U 5t b e fdow?i w a
šjcl)šlownward and toiiff) - & q h w r T --
(e) whose directions canno be qualitatively discussed without more information. ` w
2. (5) A person pushes vertically downward with force P on a lever of length L that is inclined