The lowest-mass object that can initiate thermonuclear fusion of hydrogen has a mass of about
a. 1 solar masses.
b. 80 solar masses.
c. 8 solar masses.
d. 0.08 solar masses.
e. 0.001 solar masses.
d
Physics & Space Science
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The SI units for k, the spring constant, are equivalent to:
a. J. b. J / N. c. kg / s2. d. None of the above.
Physics & Space Science
The Earth is 93 million miles (mi) from the Sun and its period of revolution is 1 year = 3.15 × 10^7 s. What is the acceleration of the Earth in its orbit about the Sun?
a. 18.6 mi/s2 c. 13.6 × 10^-6 mi/s2 b. 9.3 × 10^-3 mi/s2 d. 3.7 × 10^-6 mi/s2
Physics & Space Science
How does metal content vary between Population I and II? Why?
What will be an ideal response?
Physics & Space Science
A star approaching Earth will show spectral lines that are shifted to longer wavelengths.
Answer the following statement true (T) or false (F)
Physics & Space Science