The background stars during a solar eclipse are those of constellations
A) of the opposite season.
B) seen in the nighttime sky.
C) not seen normally.
D) seen in the opposite hemisphere.
Answer: A
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A molecule in an ideal gas has an rms velocity 450 m/s. If the mean free path of the particle in the gas is 
then what is the average time between collisions?
a. 
b. 
c. 
d. 
e. 
The figure below shows a planet traveling in a counterclockwise direction on an elliptical path around a star located at one focus of the ellipse. When the planet is at point A,
A. its speed is decreasing. B. its angular momentum is increasing. C. the gravitational force does no work on the planet. D. all of the above are correct. E. none of the above is correct.
A river has a steady speed of 0.30 m/s. A student swims downstream a distance of 1.2 km and returns to the starting point. If the student swims with respect to the water at a constant speed and the downstream portion of the swim requires 20 minutes, how much time is required for the entire swim?
a. 50 minutes b. 80 minutes c. 90 minutes d. 70 minutes e. 60 minutes
A sphere is dropped from a great height and when its speed reaches 20 m/s, its acceleration downward is 8.4 m/s2 . If the drag force is proportional to the square of the speed, what will be its acceleration downward when its speed reached 40 m/s?
a. 2.6 m/s2 b. 4.2 m/s2 c. 8.0 m/s2 d. 0 m/s2 because it has now reached terminal velocity.