Angular momentum plays an important role in star formation. Which of the following characteristics of a protostellar system is probably not strongly affected by the star's angular momentum?
A) the strength of protostellar winds B) the existence of protostellar jets
C) the formation of a protostellar disk D) the onset of core hydrogen fusion
D
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Betelgeuse is the bright red star representing the left shoulder of the constellation Orion. All the following statements about Betelgeuse are true. Which one can you infer from its red color?
A) It is much brighter than the Sun. B) Its surface is cooler than the surface of the Sun. C) It is much more massive than the Sun. D) It is moving away from us.
A mountain climber encounters a crevasse in an ice field. The opposite side of the crevasse is a height h lower, and is separated horizontally by a distance w
To cross the crevasse, the climber gets a running start and jumps in the horizontal direction. If the height of the crevasse increases but the width remains the same, then, A) the minimum speed needed to cross the crevasse increases. B) the minimum speed needed to cross the crevasse decreases. C) the minimum speed needed to cross the crevasse stays the same D) the minimum speed needed to cross the crevasse will depend on the mass of the mountain climber. E) the minimum speed needed to cross the crevasse will depend on the weight of the mountain climber.
Is it possible for each of three stationary charged particles to exert a force of attraction on the other two?
1.yes 2.no
The lengths of the hour and minute hands of a clock are 4 cm and 6 cm, respectively. If the vectors 
represent the hour and minute hands, respectively, then 
at 5:00 pm is closest to
A. 24 cm2 out of the clock face. B. 24 cm2 into the clock face. C. 21 cm2 out of the clock face. D. 21 cm2 into the clock face. E. 12 cm2 out of the clock face. F. 12 cm2 into the clock face.