What happens to the visible radiation produced by new stars within a molecular cloud?
A) It escapes the cloud completely.
B) It is absorbed by dust grains and heats up the cloud.
C) It is reflected back onto the protostar, heating it up further.
D) The blue light is absorbed and the red light transmitted.
E) It shoots out in bright jets.
B
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Free Fall: An object is thrown upwards with a speed of 16 m/s. How long does it take it to reach a height of 7.0 m on the way up? Neglect air resistance.
A. 0.52 s B. 1.2 s C. 2.4 s D. 3.1 s E. 4.2 s
The area in the Sun's atmosphere located above the chromosphere (1,500 - 10,000 km) where the temperature rises dramatically is called the
A) photosphere. B) corona. C) solar wind. D) transition zone. E) convection zone.
What is the internal energy of 50 moles of neon gas (molecular mass = 20 u) at 20.0°C? (R = 8.31 J/mol/K)
a. 1.8E+5 J b. 8.1E+5 J c. 2.1E+3 J d. 1.2E+4 J e. It depends on the container size, which is not given.
Suppose you have 1 kg each of iron, glass, and water, and all three samples are at 10°C. Rank the samples from lowest to highest temperature after 100 J of energy is added to each by heat. e
1.iron, glass, water 2.water, glass, iron 3.glass, iron, water 4.water, iron, glass 5.iron, water, glass