Ice has been detected near the poles of both the Moon and Mercury
Indicate whether the statement is true or false
TRUE
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If two objects are electrically attracted to each other,
A) both objects must be negatively charged. B) both objects must be positively charged. C) one object must be negatively charged and the other object must be positively charged. D) one of the objects could be electrically neutral. E) None of the above statements are absolutely true.
Although neutron stars are very hot, they are faint and not easy to see at visual wavelengths because
a. light does not escape from their event horizon. b. most lie beyond dense dust clouds. c. they have only a small surface area from which to emit. d. the peak of their thermal emission is at much shorter wavelengths than visual. e. they have only a small surface area from which to emit and the peak of their thermal emission is at much shorter wavelengths than visual.
Many of the brightest stars we see are only a few million years old
Indicate whether the statement is true or false
A 2.0-kg projectile moves from its initial position to a point that is displaced 20 m horizontally and 15 m above its initial position. How much work is done by the gravitational force on the projectile?
a. +0.29 kJ b. ?0.29 kJ c. +30 J d. ?30 J e. ?50 J