The tension in a string from which a 4.0-kg object is suspended in an elevator is equal to 44 N. What is the acceleration of the elevator?
a. 11 m/s2 upward
b. 1.2 m/s2 upward
c. 1.2 m/s2 downward
d. 10 m/s2 upward
e. 2.4 m/s2 downward
b
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A spaceship approaches the Moon, traveling at 0.5c with respect to the Moon. Its crew shines a laser at the Moon. The beam strikes a lunar mirror and is reflected back to the ship. The crew on the ship will measure the speed of the reflected beam to be
A. 1.5c. B. 0.75c. C. 2.0c. D. c. E. 0.5c.
The greenhouse effect occurs because carbon dioxide is opaque to infrared radiation
Indicate whether the statement is true or false
Millisecond pulsars that are very old are
a. believed to be the result of mass transfer from a companion that increases the spin of the pulsar. b. all single objects. c. not spinning as rapidly they seem because they have four hot spots that produce the flashes. d. X-ray binaries. e. gamma-ray bursters.
Which of the following statements was true beyond the frost line (but not interior to it)?
a. It was so warm that only metal and rock could condense from the gas. b. This was the only region that flattened into a disk. c. No object as small as a terrestrial planet could form. d. It was cold enough for hydrogen compounds to condense into ices