How does a gas cloud become hot?
What will be an ideal response?
Once the gas cloud begins to contract, gravity cause the atoms to fall toward the center, gaining speed as they go. This is known as free-fall collapse. By the time the atoms have fallen most of the way to the center of the cloud, they are traveling rapidly. The atoms begin to collide with one another and convert their inward motion to jumbled, random motion of thermal energy, causing the temperature of the gas to increase. When the contracting core becomes hot enough, it produces short-wavelength radiation to which the core is not transparent, then the core's thermal energy can no longer escape, making it even hotter.
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If you draw a spacetime diagram, how will the worldline of an object that is traveling by you at constant speed appear?
A) vertical B) horizontal C) slanted D) curved E) a circle
What do you expect the spectrum of an object that is 1,000,000 Kelvin to be like?
a) It should give off less total light than the Sun. b) It should peak at violet wavelengths. c) It should peak at X-ray wavelengths. d) It should give off about 10 times more total light than the Sun. e) It should peak at radio wavelengths.
All real images
a. cannot be focused on a screen. b. are erect. c. can be focused on a screen. d. are inverted.
A rectangular-shaped patio has a base length equal to (24.5 ± 0.2) m and a height equal to (9.3 ± 0.1) m. What is the area of the patio, including its uncertainty?
a. 228 ± 4 b. 228 ± 2 c. 228 ± 23 d. 228 ± 6