A book is placed on a chair. Then a videocassette is placed on the book. The floor exerts a normal force
A. on all three.
B. only on the book.
C. only on the chair.
D. upwards on the chair and downwards on the book.
E. only on the objects that you have defined to be part of the system.
Answer: C
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What was the most controversial issue surrounding the nature of the Universe during the Renaissance?
a. The movement of visible galaxies b. The origins of the Universe c. The number of planets in the Solar System d. The position of Earth in the Universe e. The existence of life on planets other than Earth
Which of the following planets in our solar system can we see occasionally transit across the face of the Sun?
A) Mercury only B) Mercury and Venus C) Mercury, Venus, and Mars D) Mars, Jupiter, and Saturn E) all of the planets
If, with steady state heat flow established, you double the thickness of a wall built from solid uniform material, the rate of heat loss for a given temperature difference across the thickness will
A) become one-half its original value. B) also double. C) become one-fourth its original value. D) become 1/ of its original value. E) become four times its original value.
A series circuit consists of ac source, a 90-? resistor, a 0.80-H inductor, and an 80-?F capacitor. The frequency of the source is adjusted so that the capacitive reactance is equal to twice the inductive reactance
What is the frequency of the source? A) 13 Hz B) 14 Hz C) 17 Hz D) 19 Hz E) 16 Hz