Which of the following may be caused by a protostellar disk?
A) protostellar jets
B) protostellar winds
C) accretion of material onto the star
D) relatively slow protostellar rotation
E) all of the above
E
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During the June solstice, the Sun rises in the southeast horizon in Earth's Northern Hemisphere.
Answer the following statement true (T) or false (F)
The overall result of the proton-proton chain is
A) 6 H becomes 1 He + energy. B) p + p becomes 2H + energy. C) 4 H becomes 1 He + energy. D) Individual protons are joined into long chains of protons.
If they existed, and if they were watching, a civilization at the center of the Milky Way could have detected our first TV signals by now
Indicate whether the statement is true or false
As an object of mass 60 kg approaches the bottom of a ramp, point A, its speed is 20 m/s. It goes up the frictionless plane and turns around at point B. What is the potential energy of this object at point B? Use g = 10 m/s2
A) 0 J B) 6.0 × 103 J C) 9 × 103 J D) 12 × 103 J E) 18 × 103 J