At about what fraction of the speed of light do our fastest current spacecraft travel?
A) 1/2
B) 1/10
C) 1/100
D) 1/1000
E) 1/10,000
E) 1/10,000
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According to our present theory of solar system formation, why were solid planetesimals able to grow larger in the outer solar system than in the inner solar system?
A) The solid material that accreted in the outer solar system included ices, while the solid material of the inner solar system consisted only less abundant metal and rock. B) There was more time for accretion in the outer solar system before the solar wind cleared the nebula away. C) The gas in the outer solar system contained a larger proportion of rock, metal, and hydrogen compound than the gas in the inner solar system. D) Gravity was stronger in the outer solar system, allowing more solid material to collect.
The net force exerted on a car traveling in a circular path at constant speed is
A) directed forward, in the direction of travel. B) directed toward the center of the curve. C) zero because the car is not accelerating. D) none of the above
When a 24.0-W resistor is connected across a 12.0-V battery, a current of 410 mA flows. What is the resulting terminal voltage of the battery?
a. 11.6 V c. 0.4 V b. 9.8 V d. 12.0 V
The Sun's habitable zone
A) extends from some place a little beyond the orbit of Venus to some place near the orbit of Mars. B) consists only of Earth, because Earth is the only planet known to be inhabited. C) extends from the orbit of Earth to the orbit of Jupiter. D) extends from just beyond the orbit of Mercury to just beyond Earth's orbit.