1. For a system in static equilibrium, which statement below best describes the
ID: 1776274 • Letter: 1
Question
1. For a system in static equilibrium, which statement below best describes the physics of the system?
A. Sum of forces in the x-direction=0
B. Sum of forces in the y-direction=0
C. Sum of torques around an axis=0
D. All the above
2. You are designing a mechanical arm to be used on an assembly line. You decide to use a beam L in length with a mass of M. The beam will be pivoted at one end, and a cable attached to a motor—acting like a bicep— will raise and lower the arm in a manner similar to how a human arm works. The cable attaches a distance d from the pivot point. When the beam is horizontal, the cable makes and angle of theta with the beam. The center of mass of the beam is a distance r from the pivot point. You wish to find the force F the cable must exert to hold the arm in the horizontal position. The acceleration of gravity is g. Which formula is correct?
A. Mgd
F= ------------------
r sin(theta)
B. Mgr
F= ------------------
d sin(theta)
C. MgL
F= ------------------
r sin(theta)
3.
Suppose
L=1.2 m
M=0.3 kg
d=0.1 m
theta=82 degrees
r=0.6 m.
What is the value of F?
A. 18 B. 28 C.38
4. For the experiment, to what force range should the force probe be set?
A. 0-10
B 0-50
Explanation / Answer
1. For a system in static equilibrium, which statement below best describes the physics of the system?
A. Sum of forces in the x-direction=0
B. Sum of forces in the y-direction=0
C. Sum of torques around an axis=0
D. All the above
Since in equilibrium , net torque and net force must be 0.
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