Stars less massive than about 0.4 solar mass are referred to as _____
A) brown dwarfs
B) red dwarfs
C) yellow dwarfs
D) white dwarfs
B
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An iron ball and a wooden ball of the same size are dropped from a tall tower. Taking air resistance into consideration, the object to hit the ground first will be the
A) lighter wooden ball. B) heavier iron ball. C) both hit at the same time. D) not enough information
What is the evidence that gamma-ray bursts originate from beyond the Milky Way Galaxy?
What will be an ideal response?
Two equal mass balls (one blue and the other gold) are dropped from the same height, and rebound off the floor. The blue ball rebounds to a higher position
Which ball is subjected to the greater magnitude impulse during its collision with the floor? A) the gold ball B) Both balls were subjected to the same magnitude impulse. C) It's impossible to tell since the time intervals and forces are unknown. D) the blue ball
A 15-kg child is sitting on a playground teeter-totter, 1.5 m from the pivot. What is the magnitude of the minimum force, applied 0.30 m on the other side of the pivot, that is needed to make the child lift off the ground?
A) 66 N B) 23 N C) 75 N D) 740 N E) 44 N