What do astronomers mean when they refer to "gaps" in the asteroid belt between Mars and Jupiter?
A) There is a large population of asteroids too faint to see called the "gap" asteroids.
B) Asteroids seem to avoid certain orbits around the Sun, creating "gaps" in the orbits that asteroids can have.
C) Asteroids typically cluster together and this creates "gaps" on the sky.
D) There are either pure metal or pure rock asteroids, but no mixtures. Thus there is a "gap" in the composition of asteroids.
E) There are very few asteroids with diameters between 1 and 100 kilometers, creating a "gap" in the size distribution.
B
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The bulk stress on the ball due to the water is
a. 
b. 
c. 
d. 
e. 
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Indicate whether the statement is true or false
The orientation of an image seen projected on a screen by a single lens is always __________
Fill in the blank(s) with correct word
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