A very lightweight horizontal loop of wire is suspended from a fine spring, lowered into water, and then raised to the surface. Any further attempt to raise it causes the spring to
A) stretch.
B) contract.
C) stay the same.
Answer: A
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What led Kepler to abandon circular orbits and his discovery that planetary orbits are ellipses?
A) a deviation between observed and model values that was much larger than the observation uncertainties B) a desire to gain prestige by using a more complicated model C) the observation of a comet moving on a highly eccentric orbit
An electric toaster operating on 120 volts draws a current of 9 amperes. What is the resistance of the toaster?
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
A bullet is fired through a board, 14.0 cm thick, with its line of motion perpendicular to the face of the board. If it enters with a speed of 450 m/s and emerges with a speed of 220 m/s, what is the bullet's acceleration as it passes through the board?
a. ?500 km/s2 b. ?550 km/s2 c. ?360 km/s2 d. ?520 km/s2 e. ?275 km/s2