The outflow channels on Mars indicate a flood period in the history of Mars. During this time, based on the width and depth of the remaining riverbed, it is thought that the flow rate must have been
A) just a small trickle, barely more than a stream of water.
B) moderate, about the flow rate of the Ohio River.
C) fairly large, about the flow rate of the current Colorado River.
D) significantly large, about the flow rate of the Amazon River.
E) enormous, as much as 100 times the flow rate of the Amazon River.
E
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The iron we commonly find in our surroundings came from:
A) the iron core of a massive star which exploded as a type I supernova. B) planetary nebulae. C) jets ejected by a rapidly spinning pulsar. D) material ejected by a nova explosion. E) decay of nickel 56 and cobalt 56 in a supernova remnant.
A nearsighted person cannot see objects beyond 80 cm from his eyes. Which one of the following combinations represents the correct focal length and the refractive power of the contact lenses that will enable him to see the distant objects clearly?
A) +80 cm, +1.3 diopters B) -80 cm, +1.3 diopters C) +80 cm, -1.3 diopters D) -80 cm, -1.3 diopters E) -1.3 cm, +1.3 diopters
A 5.0-kg object is pulled along a horizontal surface at a constant speed by a 15-N force acting 20° above the horizontal. How much work is done by this force as the object moves 6.0 m?
a. 78 J b. 82 J c. 85 J d. 74 J e. 43 J
Which of the following statements about our Sun is not true?
A) The Sun contains more than 99% of all the mass in our solar system. B) The Sun is a star. C) The Sun's diameter is about 5 times that of Earth. D) The Sun is made mostly of hydrogen and helium.