The frictional force of the floor on a large suitcase is least when the suitcase is
a. pushed by a force parallel to the floor.
b. dragged by a force parallel to the floor.
c. pulled by a force directed at an angle ? above the floor.
d. pushed by a force directed at an angle ? into the floor.
e. turned on its side and pushed by a force parallel to the floor.
c
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An 1800 kg car traveling at 35.0 m/s strikes a wall. If the car comes to rest in 0.500 seconds, then the average force of the wall on the car is
A. 
B. 
C. 
D. 
E. 
What are the primary reasons for making telescopes larger?
a. to make things look bigger b. to decrease image resolution c. to collect more light to so faint objects can be seen d. to see a larger part of the sky
The mass number of an atom is equal to the number of what particles in the nucleus?
A) protons B) neutrons C) nucleons D) electrons E) positrons.
A supersonic aircraft flies between observers A and B as shown. The resulting sonic boom will soon be heard by
1) only observer A. 2) only observer B. 3) both A and B. 4) neither A nor B. The intensity of the sonic boom depends on the 5) speed of the aircraft. 6) size of the aircraft. 7) distance from the aircraft. 8) all of the above. 9) none of the above.