________ occurs when most of the material collapsing to form a protostar has fallen into a disk around the star and a strong wind from the warm protostar ejects material from its poles
a. An emission nebula
b. Hydrostatic equilibrium
c. The proton-proton chain
d. The thermonuclear fusion of hydrogen
e. A bipolar outflow
e
You might also like to view...
A 75.0-kg swimmer dives horizontally off a 465-kg raft initially at rest. If the diver's speed immediately after leaving the raft is 5.00 m/s, what is the corresponding raft speed?
a. 31.0 m/s b. 375 m/s c. 0.806 m/s d. 1.24 m/s e. 5.00 m/s
Red giant stars are
A) close to exhausting their supply of hydrogen. B) have already exhausted their supply of hydrogen. C) are close to exhausting their supply of helium. D) have already exhausted their supply of helium.
In general, the further away a galaxy is from the Milky Way
A: the brighter it will appear. B: the greater its redshift. C: the older it must be because its light takes so long to reach us. D: the shorter the wavelength of the light we receive from it. E: the less rapidly it will be rotating.
A tennis player wants to slam a serve at O so that the ball lands just inside the opposite corner of the court. What should the ratio
be for the initial velocity 
? The time t = 0 is the time when the ball is hit by the racket.
?
?
a.
W/L
b.
L/W
c.
d.
e.