Suppose we hold a sample of helium gas at a constant temperature while we slowly compress it in a cylinder until its volume has decreased by a factor of 4. During this process, the gas’s entropy
A. increases.
B. decreases.
C. remains the same.
D. Does something else (specify).
B. decreases.
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The great contribution of Tycho Brahe was to ________
A) offer the first detailed model of a Sun-centered solar system, thereby beginning the process of overturning the Earth-centered model of the Greeks B) observe planetary positions with sufficient accuracy so that Kepler could later use the data to discover the laws of planetary motion C) discover four moons orbiting Jupiter, thereby lending strong support to the idea that the Earth is not the center of the universe D) discover that planets orbit the Sun in elliptical orbits with varying speed
A coil of wire is connected to a galvanometer. When the coil is rotated in a magnetic field, the galvanometer records a current. The current results because
a. the coil acts like a transformer. b. the free electrons in the conductor experience a force when they move in the magnetic field. c. an electromagnetic wave is generated. d. the wire is ferromagnetic. e. none of the above.
An air bubble is stuck to the bottom of a glass of water. When the glass is shaken slightly and the bubble becomes free and starts to ascend in the water, what happens to its size?
1.The bubble remains the same size as it rises. 2.The bubble gets bigger as it rises. 3.The bubble gets smaller as it rises. 4.It is impossible to tell what will happen to the bubble's size.
A 10-turn square coil of area 0.036 m2 and a 6-turn circular coil are both placed at an angle of 25° to the same changing magnetic field. The voltage induced in each of the coils is the same. What is the area of the circular coil?
a. 0.072 m2 c. 0.072 m2 b. 0.060 m2 d. 0.60 m2