Velocity: A motorist makes a trip of 180 miles. For the first 90 miles she drives at a constant speed of 30 mph. At what constant speed must she drive the remaining distance if her average speed for the total trip is to be 40 mph?
A. 45 mph
B. 50 mph
C. 52.5 mph
D. 55 mph
E. 60 mph
Answer: E
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General Questions: A truck is using a hook to tow a car whose mass is one quarter that of the truck. If the force exerted by the truck on the car is 6000 N, then the force exerted by the car on the truck is
A. 1500 N. B. 24,000 N. C. 6000 N. D. 12,000 N. E. We need to know if the car is accelerating to answer this question.
Which of the following statements about stellar parallax is true?
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What will occur when the full moon is on the ecliptic?
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