____ is the thermonuclear fusion of hydrogen to form helium operating in the cores of massive stars on the main sequence
a. The CNO cycle
b. The proton-proton chain
c. Hydrostatic equilibrium
d. The neutrino process
e. none of the above
A
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A stone is thrown vertically upward with a speed of 24.0 m/s.
(a) How fast is it moving when it reaches a height of 13.0m? (b) How much time is required to reach this height?
The larger pulsating stars have a shorter pulsation period and higher luminosity.
Answer the following statement true (T) or false (F)
A 900-kg car traveling 30.0° south of east at 12.0 m/s collides with a 750-kg car traveling north at 17.0 m/s. The cars stick together. What is the speed of the wreckage just after the collision?
A) 7.21 m/s B) 12.2 m/s C) 20.4 m/s D) 25.0 m/s E) 17.3 m/s
The radio lobes of active galaxies can span ________ of light-years
A) tens B) hundreds C) thousands D) millions E) billions