The transition between the troposphere and the stratosphere is called the
a. stratopause.
b. tropopause.
c. mesopause.
d. thermopause.
b
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The ideal gas in a sealed container has its absolute temperature quadrupled. What happens to the average time between molecular collisions in the gas?
a. It stays the same. b. It decreases to half its original value. c. It decreases but not to half its original value. d. It increases.
Two pistons push down on the fluid filling two cylinders connected by a narrow hose, as shown in the figure. The area A1 is 1 square inch, and the area A2 is 10 square inches. A force of 4 pounds is exerted downward on piston 1, as shown
 The force F2 needed to keep piston 2 in place is __________.The supernova of 1054 AD produced:
A) a remnant still visible to the naked eye, the Crab Nebula, M-1. B) a pulsar with a period of 33 milliseconds, visible optically. C) the closest known neutron star to our Sun. D) the most famous black hole. E) no remaining visible trace, as it was a type I supernova.
A long solenoid (radius = 3.0 cm, 2 500 turns per meter) carries a current given by I = 0.30 sin(200?t) A, where t is measured in s. When t = 5.0 ms, what is the magnitude of the induced electric field at a point which is 2.0 cm from the axis of the solenoid?
a. 7.3 × 10^?3 V/m b. 6.4 × 10^?3 V/m c. 6.9 × 10^?3 V/m d. 5.9 × 10^?3 V/m e. 8.9 × 10^?3 V/m