Humanity has been thinking about the possibility of extraterrestrial life
A) since the first reports of unidentified flying objects in the 1940's
B) since reports of canals on Mars were first made in the 1870's
C) throughout human history since the time of the ancient Greeks
C
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Two objects, one of mass m and the other of mass 2 m, are dropped from the top of a building. If there is no air resistance, when they hit the ground
A. the heavier one will have twice the kinetic energy of the lighter one. B. both will have the same kinetic energy. C. the heavier one will have half the kinetic energy of the lighter one. D. the heavier one will have four times the kinetic energy of the lighter one. E. the heavier one will have one-fourth the kinetic energy of the lighter one.
Suppose there were no solar wind. How would the appearance of a comet in our inner solar system be different?
A) It would not have a nucleus. B) It would be much brighter in appearance. C) It would not have a coma. D) It would have only one tail instead of two.
A hunter wishes to cross a river that is 1.5 km wide and flows with a velocity of 5.0 km/h parallel to its banks. The hunter uses a small powerboat that moves at a maximum speed of 12 km/h with respect to the water. What is the minimum time for crossing?
What will be an ideal response?
Jupiter radiates less heat than it absorbs from the sun
Indicate whether the statement is true or false