Which process is required to allow a gravitationally-collapsing gas cloud to continue to collapse?
A) The cloud must radiate away much of its thermal energy.
B) The cloud must trap most of its thermal energy.
C) The cloud must collide with other clouds.
D) New dust particles must continually be made in the cloud.
A) The cloud must radiate away much of its thermal energy.
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a. half-silvered mirror b. convex mirror c. concave mirror d. plane mirror.
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What will be an ideal response?
A star near the lower right of the H-R diagram is likely to be
A) red, with high luminosity. B) red, with low luminosity. C) hot, bright, and very large. D) yellow, with luminosity similar to our Sun's. E) blue, with high luminosity.
The de Broglie wavelength of which of the following objects would be smallest if the objects had the same velocity?