If the ground-level air temperature is 20°C, what is the air temperature at the top of the troposphere (16 km), assuming a normal lapse rate?
–84°C
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A magnesium alloy that begins with the letters “AK” has major alloy elements of aluminum and _________.
Fill in the blank(s) with the appropriate word(s).
Acceleration: A racquetball strikes a wall with a speed of 30 m/s and rebounds in the opposite direction with a speed of 26 m/s. The collision takes 20 ms. What is the average acceleration of the ball during the collision with the wall?
A. 0 m/s2 B. 200 m/s2 C. 2800 m/s2 D. 1500 m/s2 E. 1300 m/s2
Power: A resistance heater is rated at 1200 W when operating at 110 V dc. What current will it draw?
A. 0.090 A B. 1.0 A C. 11 A D. 12 A
Which of the following best explains the hypothesized phenomenon of black hole evaporation?
A) Particles (or anti-particles) are occasionally ejected from within the event horizon, causing the black hole to lose mass. B) Virtual particles created near the black hole are constantly annihilating each other, causing a very high temperature even if the black hole has no accretion disk. This high temperature provides escape velocity for the virtual particles, causing the entire "cloud" of virtual particles to expand away into space. C) Particles (or anti-particles) are created by a quantum mechanical effect near, but outside, the event horizon of the black hole. The law of conservation of energy maintains that the black hole must lose energy to "pay" for the creation of this mass. D) Black hole evaporation is a virtual process, meaning that it has been theorized by astrophysicists, but doesn't really occur.