Because the earth's orbit is slightly elliptical, the earth actually gets closer to the sun during part of the year. When the earth is closer to the sun its orbital speed is
A) less than when the earth is farthest away from the sun.
B) the same as when the earth is farthest away from the sun.
C) greater than when the earth is farthest away from the sun.
Answer: C
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The voltage supplied to an ac circuit is given by v = 120 sin(377t). What is the voltage at 
A. 0.00 V B. 2.37 V C. 63.0 V D. 109 V E. 119 V
Conservation of Momentum: Consider two less-than-desirable options. In the first you are driving 30 mph and crash head-on into an identical car also going 30 mph. In the second option you are driving 30 mph and crash head-on into a stationary brick wall. In neither case does your car bounce back from the thing it hits, and the collision time is the same in both cases. Which of these two situations would result in the greater impact force on your car?
A. hitting the other car B. hitting the brick wall C. The force would be the same in both cases. D. None of these choices are correct.
Vision Problems: A person's hyperopic (farsighted) eye can focus on objects that are 75 cm away and farther. What power and what focal length contact lenses should be prescribed so this person can see objects 25 cm and farther from the eye?
Fill in the blank(s) with the appropriate word(s).
What condition must apply to a system's state of motion for it to be regarded as an inertial frame of reference?
a. in decreasing velocity b. in constant velocity c. in constant acceleration d. in increasing acceleration