The 500-m-long spaceship Springbrake is at rest on the planet Hitest for refueling. Another spaceship, Summerbrake, passes parallel to Springbrake at 0.600c. The crew on Springbrake measure the length of Summerbrake as it passes and find that the length they measure is exactly the same as the known 500-m rest length of Springbrake. If Summerbrake were at rest next to Springbrake, its length would
then be measured to be
a. 180 m.
b. 320 m.
c. 500 m.
d. 625 m.
e. 781 m.
d
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Observations and stellar evolution models indicate that the central star of a planetary nebula finally must contract and become a _____
A) yellow giant B) white dwarf C) red giant D) black dwarf
Two identical balls are at rest and side by side at the top of a hill. You let one ball, A, start rolling down the hill. A little later you start the second ball, B, down the hill by giving it a shove. The second ball rolls down the hill along a line parallel to the path of the first ball and passes it. At the instant ball B passes ball A:
a. it has the same position and the same velocity as A. b. it has the same position and the same acceleration as A. c. it has the same velocity and the same acceleration as A. d. it has the same displacement and the same velocity as A. e. it has the same position, displacement and velocity as A.
During the inflation that started at about 10^-37 seconds after the Big Bang, the universe expanded by:
a. up to 10^50 in as little as 10^-47 seconds. b. up to 10^42 in as little as 10^-40 seconds. c. up to 10^30 in as little as 10^-36 seconds. d. by about a factor of 10 up to the present time. e. by no significant amount.
A container holds 1 million helium molecules at 300 K. If we double the gas’s temperature to 600 K, by about what factor does its multiplicity increase?
A. ln 2 B. 2 C. 23/2 D. 106 kB ln 2 E. 21,000,000 F. 21,500,000 T. Some other factor (specify)