The amount of light from an incandescent lamp that is transmitted through an ideal Polaroid filter is half, and through a classroom Polaroid filter is
A) less than half.
B) more than half.
C) half.
Answer: A
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Two cars are traveling around identical circular racetracks. Car A travels at a constant speed of 20 m/s. Car B starts at rest and speeds up with constant tangential acceleration until its speed is 40 m/s. When car B has the same (tangential) velocity as car A, it is always true that:
A. it is passing car A. B. it has the same linear (tangential) acceleration as car A. C. it has the same centripetal acceleration as car A. D. it has the same total acceleration as car A. E. it has traveled farther than car A since starting.
Suppose that a certain saber-toothed-tiger contained one gram of 14C [half-life 6000 years] when it died. The approximate 14C content of the remains of this tiger 24,000 years later would be
A) zero grams. B) 1/8 gram. C) 1/32 gram. D) 1/16 gram. E) impossible to predict.
The grooved terrain found on Ganymede is believed to be:
A) systems of faults in the brittle crust. B) flow channels or liquid methane. C) caused by meteor impacts. D) formed with long cracks in its icy crust.
What is the magnitude of the potential difference across the 20-? resistor?
A. 3.2 V B. 7.8 V C. 11 V D. 5.0 V E. 8.6 V