A 24.0 N picture hangs from a nail in the wall. The diameter of the nail is 2.00 mm. The shear stress on the nail is
a. 
b. 
c. 
d. 
e. 
a.
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The vector sum of three co-planar forces
A. must be zero. B. must be perpendicular to one of the three. C. must be parallel to one of the three. D. must be perpendicular to the plane. E. may have any direction in the plane.
Suppose you were near a site with mercury pollution and were told that a plant could take mercury up, but that it would emit mercury vapor. Would it be worth planting these plants? Why or why not? (This is an expected phenomenon.)
What will be an ideal response?
Most interstellar clouds remain stable in size because the force of gravity is opposed by ________ within the cloud.
A) thermal pressure B) degeneracy pressure C) radiation pressure D) stellar winds
The reference point for latitude
What will be an ideal response?