The motion of gas in accretion disks and jets is ____.
a. well explained by Einstein's theory of general relativity
b. poorly understood, but may depend on magnetism
c. well explained by Kepler's laws
d. poorly understood, but may depend on relativity
e. well explained by electromagnetic wave theory
b
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Answer the following statement(s) true (T) or false (F)
1. A particle’s mass is the same in all inertial reference frames (even though its speed is not) 2. The components of a particle’s four-momentum are the same in all inertial reference frames. 3. As a particle’s speed approaches that of light, the difference between its relativistic momentum magnitude and its relativistic energy E becomes small (compared to E).
The reason that small planets tend to lose interior heat faster than larger planets is essentially the same as the reason that ________
A) Earth contains more metal than the Moon B) a large baked potato takes longer to cool than a small baked potato C) thunderstorms tend to form on hot summer days D) gas bubbles form and rise upward in boiling water
Fluorescent bulbs have recently become much more efficient due to the introduction of
A) high-emission phosphor coatings on the inside of the bulb. B) new types of gases, that glow brighter, within the tube. C) lower density--i.e., lower pressure--gases within the tube. D) electronically controlled high-frequency ballasts. E) longer bulbs.
A Geiger counter registers a count rate of 8,000 counts per minute from a sample of a radioisotope. The count rate 24 minutes later is 1,000 counts per minute. The half-life of the radioisotope is
a. 3 minutes. b. 4 minutes. c. 6 minutes. d. 8 minutes. e. 12 minutes.