When is thermal energy trapped in the dense center of a cloud?
A) when the gravity becomes so strong that photons cannot escape
B) when excited molecules collide with other molecules before they can release a photon
C) when the cloud becomes so hot and dense that nuclear fusion begins
D) when magnetic fields trap the radiation
E) when the cloud cools down so much that less light escapes than is produced by contraction
B
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A 20.0 cm wrench is used to generate a torque at a bolt. A force of 50 N is applied perpendicularly at the end of the wrench. The torque generated at the bolt is
A. 8.0 N•m. B. 10 N•m. C. 14 N•m. D. 22 N•m. E. 37 N•m.
One of the methods used to date supernova remnants (the remains of exploded stars) today is by using
A. the works of Ptolemy. B. the records of ancient Chinese, Japanese, and Korean astronomers. C. Kepler's laws. D. the notebooks of Galileo.
Both black and white road surfaces radiate energy. At midnight on a starry night the warmer road surface is the
A) black surface. B) white surface. C) neither, as no noticeable difference.
The star-gas-star cycle will continue forever because stars are continually recycling gas
Indicate whether the statement is true or false