In a star, the balance between the inward force of gravity and the outward force of thermal and radiation pressure is called
a. the neutrino bonding point.
b. hydrostatic equilibrium.
c. the plasma equality condition.
d. strong nuclear binding.
b
Physics & Space Science
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An astronaut floating alone in outer space throws a baseball. If the ball moves away at 20 m/s, the astronaut will move in the opposite direction at
A) 20 m/s. B) a lower speed. C) a higher speed. D) more information needed E) none of the above
Physics & Space Science
All the planet's orbits are evenly spaced
Indicate whether the statement is true or false
Physics & Space Science
What is the magnitude of the momentum of a proton moving at 0.95 c? 
A. 
B. 
C. 
D. 
E. 
Physics & Space Science
If the Moon is rising at midnight, the phase of the Moon must be
A) full. B) first quarter. C) third quarter. D) waning crescent. E) waxing crescent.
Physics & Space Science