Explain what keeps the nuclear reactions in a star under control; i.e., what would happen if too large an amount of energy is released in the center?
What will be an ideal response?
If the star makes slightly too much energy, the extra energy flowing out of the star would force its layers to expand slightly, lowering the central temperature and density and slowing the nuclear reactions until the star regained stability.
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Careful measurements reveal that a star maintains a steady apparent brightness at most times, except that at precise intervals of 93 hours. the star becomes dimmer for about 2 hours. The most likely explanation for this is that the star ________
a. has a very large "sunspot" on its surface b. is a member of an eclipsing binary star system c. is a white dwarf d. is a Cepheid variable e. is periodically ejecting gas into space, every 93 hours
The fusion of helium into carbon will take a temperature of at least
a. 5 million degrees Kelvin b. 10 million degrees Kelvin c. 50 million degrees Kelvin d. 100 million degrees Kelvin e. 600 million degrees Kelvin
Angular Quantities: What is the angular speed, in rad/s, of a flywheel turning at 813.0 rpm?
A. 85.14 rad/s B. 13.53 rad/s C. 63.84 rad/s D. 95.33 rad/s
A particle is in the second excited state of a one-dimensional box of length 1.0 m. What is its momentum (in kg ? m/s)?
a. 6.6 × 10^?34 b. 3.3 × 10^?34 c. 9.9 × 10^?34 d. 13 × 10^?34 e. cannot be solved unless mass of particle is known