A 0.28-kg stone you throw rises 34.3 m in the air. The impulse your hand receives from the stone while it throws the stone is
a. 2.7 N s, up.
b. 2.7 N s, down.
c. 7.3 N s, up.
d. 7.3 N s, down.
e. 9.6 N s, up.
d
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A star is seen to have two transiting planets. Planet 1 transits every 3 months, and Planet 2 transits every 15 months. What can we infer about their orbits?
A) Planet 2's semimajor axis is larger than Planet 1's. B) Planet 1's orbit is more eccentric than Planet 2's. C) Planet 2's orbit is more eccentric than Planet 1's. D) Planet 1's semimajor axis is larger than Planet 2's.
An E galaxy contains
a. mostly lower-main sequence stars and giants. b. mostly upper main sequence stars and giants. c. mostly upper main sequence stars and gas and dust. d. roughly equal numbers of upper and lower main sequence stars. e. mostly white dwarfs and supergiants.
Why do we think that RNA was probably the first self-replicating molecule?
A) it is able to replicate at high temperatures found near deep-sea ocean vents B) it is much simpler than DNA C) in laboratory studies researchers have shown that it is able to catalyze its own replication D) it is able to replicate using carbohydrates rather than proteins
Three cars, car X, car Y, and car Z, begin accelerating from rest, at the same time. Car X is more massive than car Y, which is more massive than car Z. The net force exerted on each car is identical
After 10 seconds, which car has the most amount of momentum? A) They all have the same amount of momentum B) Car X C) Car Y D) Car Z