What are the advantages of making a telescope mirror thin? What problems result?
What will be an ideal response?
A thin mirror will weigh less and is less expensive. A thin mirror may bend, but telescopes can use computer controls to adjust the shape of their mirrors.
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Whitney says that Gauss's law can be used to find the electric field of a sufficiently symmetrical distribution of charge as long as 
over the whole Gaussian surface. Algie says that the electric field must be a constant vector over the entire Gaussian surface. Which one, if either, is correct?
A.
B.
.C.
D.
holds only over a portion of the Gaussian surface.E.
anywhere on the surface.Consider a point on a bicycle wheel as the wheel makes exactly four complete revolutions about a fixed axis. Compare the linear and angular displacements of the point
a. Both are zero. c. Only the linear displacement is zero. b. Only the angular displacement is zero. d. Neither is zero.
Slanting Surfaces With Friction: A flatbed truck is carrying a 20-kg crate up a sloping road. The coefficient of static friction between the crate and the bed is 0.40, and the coefficient of kinetic friction is 0.30. What is the maximum angle of slope that the truck can climb at constant speed if the crate is to stay in place?
A. 0.38° B. 13° C. 17° D. 22° E. 68°
Suppose after reaching the bottom he then continues sliding up another icy slope on the other side of the valley. When he finally comes to a stop he will have reached a height
a. equal to the height he started from on the other hill b. less than the height he started from on the other hill c. more than the height he started from on the other hill d. none of the above