An object that is moving in a linear path with an acceleration in the direction opposite to the motion has a(n) ______________ velocity
a. constant
b. increasing
c. decreasing
d. none of these
c
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A car accelerates uniformly. It starts from rest and reaches 36 m/s after 6.0 seconds. During the 6.0 seconds it has traveled ________ m.
Fill in the blank(s) with the appropriate word(s).
John rapidly pulls a plunger out of a cylinder. As the plunger moves away, the gas molecules bouncing elastically off the plunger are
a. rebounding at a higher speed than they would have if the plunger weren't removed. b. rebounding at a lower speed than they would have if the plunger weren't removed. c. rebounding at the same speed as they would have if the plunger weren't removed. d. Whether they speed up or slow down depends on how fast the plunger is removed.
What is Earth's distance from the Sun?
a. 0.39 AU b. 0.72 AU c. 1.0 AU d. 1.5 AU e. 2.8 AU
The main reason for positioning many radio telescopes across a large area and combining the signals is
a. to observe more objects in a shorter amount of time. b. provide a backup system if one or more of the telescopes go down. c. to produce higher resolution images. d. to avoid interference between signals from the separate telescopes. e. to account for the motion of objects in the sky as a result of the Earth's rotation.