Which of the following statements about the "helium flash" is correct?
A. It releases enough energy to change the degenerate gas in the core to normal gas.
B. It does not occur in high-mass stars.
C. It marks the end of the red giant stage for a star like the Sun.
D. It does not occur in stars smaller than 0.5 solar masses.
E. All of these choices are correct.
Answer: E
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A wheel starts from rest and rotates with a constant angular acceleration about a fixed axis. It completes the first revolution 6.0 s after it started. How long after it started will the wheel complete the second revolution?
a. 9.9 s b. 7.8 s c. 8.5 s d. 9.2 s e. 6.4 s
A proton with initial kinetic energy KE is moving in circular motion in a uniform magnetic field. When it has completed one eighth of a revolution, what is its kinetic energy?
a. 1.4KE b. 0.71KE c. KE d. The value is not given.
The Local Group consists of about ________ galaxies
Fill in the blank(s) with correct word
After what evolutionary stage does a star become a white dwarf?
a. protostar b. pre-main sequence c. main sequence d. giant