What percentage of the solar nebula's mass consisted of hydrogen and helium gases?
A) 0.5 percent
B) 5 percent
C) 50 percent
D) 98 percent
E) 100 percent
D
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The "wispy terrain" on Rhea was revealed by the Cassini spacecraft to be
A) ice cliffs created by tectonic fractures. B) water ice flows from past impacts that cracked its icy surface. C) the icy ash of water volcanoes. D) "maria" created during the period of high impacts. E) water ice flows from geyser-like activity.
Any object moving towards or away from the Earth will show a Doppler shift when observed from Earth
Indicate whether the statement is true or false
A 0.24 kg blob of clay is thrown at a wall with an initial horizontal velocity of 16 m/s. If the clay comes to a stop in 91 ms, what is the average horizontal force on the clay due to the wall?
A) 26 N B) 51 N C) 35 N D) 42 N
In a relay race, runner A is carrying the baton and has a speed of 3.00 m/s. When he is 25.0 m behind the starting line, runner B starts from rest and accelerates at 0.100 m/s2
How long afterwards will A catch up with B to pass the baton to B? A) 5.17 s B) 10.0 s C) 11.9 s D) 20.4 s E) A never catches up.