Heat transfer from hot or cold liquids in a thermos bottle is prevented by ______________
a. convection
b. conduction
c. radiation
d. all of these
d
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According to the theory that active galactic nuclei are powered by supermassive black holes, the high luminosity of an active galactic nucleus primarily consists of
A) light emitted by hot gas in an accretion disk that swirls around the black hole. B) intense radiation emitted by the black hole itself. C) the combined light of thousands of young, high-mass stars that orbit the black hole. D) radio waves emitted from radio lobes found on either side of the galaxy we see in visible light.
A car is moving with a speed of 32.0 m/s. The driver sees an accident ahead and slams on the brakes, causing the car to slow down with a uniform acceleration of magnitude 3.50 m/s2
How far does the car travel after the driver put on the brakes until it comes to a stop? A) 4.57 m B) 9.14 m C) 112 m D) 146 m E) 292 m
A railroad train travels forward along a straight track at 90.0 m/s for 1 000 m and then travels at 70.0 m/s for the next 1 000 m. What is the average velocity?
a. 79.3 m/s b. 78.8 m/s c. 83.8 m/s d. 75.8 m/s e. 81.5 m/s
You want to have an electron in an energy level where its speed is no more than 66 m/s
What is the length of the smallest box (an infinite well) in which you can do this? (h = 6.626 × 10-34 J ? s, mel = 9.11 × 10-31 kg) A) 5.5 µm B) 11 µm C) 2.8 µm D) 1.4 µm