When you place a sealed can of air on a hot stove, air in the can undergoes an increase in
A) thermal energy.
B) temperature.
C) pressure.
D) all of the above
E) none of the above
Answer: D
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Astronomers believe that the X-ray radiation from the nuclei of active galaxies comes from ________.
A. gravity waves B. a black hole C. magnetic fields D. the accretion disk around a massive black hole
A 1056-hertz tuning fork is sounded at the same time a piano note is struck. You hear three beats per second. What is the frequency of the piano string?
A) 1056 hertz B) 1059 hertz C) 1053 hertz D) 3168 hertz E) need more information
Which planet(s) have an atmosphere that consists mostly of carbon dioxide?
A) Venus, Earth, and Mars B) Venus and Mars C) Venus only D) Mars only
Suppose that a Ferrari and a Porsche begin a race with a moving start, and each moves with constant speed. One lap of the track is 2 km. The Ferrari laps the Porsche after the Porsche has completed 9 laps
If the speed of the Ferrari had been 10 km/h less, the Porsche would have traveled 18 laps before being overtaken. What were the speeds of the two cars?