All the following statements about Mars are true. Which one might be the cause of a significant loss of atmospheric gas to space?
A) The rock on Mars is probably red because of chemical reactions with oxygen that had been released into the atmosphere through the outgassing of water molecules.
B) Mars lost its global magnetic field, leaving the atmosphere vulnerable to the solar wind.
C) The axis tilt of Mars is thought to change significantly with time.
D) Mars probably once had a much higher density of greenhouse gases in its atmosphere than it does today.
B) Mars lost its global magnetic field, leaving the atmosphere vulnerable to the solar wind.
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Compared to a recoiling rifle, the bullet that is fired has a greater
A) momentum. B) kinetic energy. C) none of the above
The vertical acceleration of a projectile
a. equals g pointing downwards. b. equals g pointing upwards. c. equals g pointing sometimes upwards and other times downwards. d. is zero. e. continuously increases.
The distance between two cities is 100 miles. The distance in kilometers is
1.exactly 100 kilometers. 2.less than 100 kilometers. 3.unable to be determined from given information. 4.more than 100 kilometers.
Does a high-speed bullet's path bend more than a light beam bends as it passes near Earth?
A) Yes, because the bullet is heavier than the light beam. B) Yes, because the light beam has a greater acceleration that the bullet. C) Yes, because the bullet moves slower than the light beam. D) No, because all falling objects accelerate at the same rate. E) No, because of Einstein's equivalence principle.