In its most energetic phase, a quasar can probably only last
A) a few days.
B) a few years.
C) a few thousand years.
D) a few million years.
E) a few billion years.
D
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Triton's source of internal heat is mostly associated with
A) tidal heat associated with its elliptical orbit around Neptune B) tidal heat left over from it being captured into orbit around Neptune C) radioactive decay D) heat left over from its formation
Rotational Kinetic Energy: A solid uniform disk is rolling without slipping along a horizontal surface with a speed of 4.5 m/s when it starts up a ramp that makes an angle of 25° with the horizontal. What is the speed of the disk after it has rolled 3.0 m up as measured along the surface of the ramp?
A. 4.0 m/s B. 1.9 m/s C. 2.1 m/s D. 6.8 m/s E. 8.0 m/s
X-rays, because they have more energy, travel through space faster than visible light
Indicate whether the statement is true or false
What causes the outward gas pressure that balances the inward pull of gravity in a main-sequence star?
a. the rapid outward flow of gas b. the rapid inward flow of the gas c. the high temperature of the gas d. the high density of the gas e. the high temperature and the high density of the gas