Compared to life on Europa, if life exists on Ganymede it will probably be
A) less abundant and less evolved
B) more abundant and more evolved
C) less abundant but more evolved
D) more abundant but less evolved
A
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You take a roundtrip to a star located 1000 light-years away (so the roundtrip distance is 2000 light-years in Earth's reference frame) at an average speed of 0.99c. Based on the time dilation formula below, about how many years will pass on Earth while you are gone?
t' = t A) 2.8 years B) 10 years C) 28 years D) 2000 years E) 280 years
The speed v of an object falling with a constant acceleration g can be expressed in terms of g and the distance traveled from the point of release, h, as v = agbhc, where a, b, and c, are dimensionless constants. What must be the values of b and c?
What will be an ideal response?
Which of the following statements best explains why the densities of Uranus and Neptune are higher than that of Saturn, even though Saturn is much more massive?
a They have higher masses. b. They have a higher proportion of hydrogen compounds and rock. c. They have stronger magnetic fields. d. They are at greater distances from the Sun. e. Their interiors are more compressed due to stronger gravity.
A 0.140-kg baseball is dropped from rest from a height of 2.2 m above the ground. It rebounds to a height of 1.6 m. What change in the ball's momentum occurs when the ball hits the ground?
A) 0.117 kg?m/s upwards B) 0.117 kg?m/s downwards C) 1.70 kg?m/s upwards D) 0.350 kg?m/s upwards E) 0.350 kg?m/s downwards