How are Cepheids and RR Lyrae stars different?
What will be an ideal response?
Cepheids are large mass variable stars with a definite relationship between period and luminosity, which can be as high as thousands of suns. RR Lyrae stars are low mass variable stars with periods under one day, and all have about the same luminosity, about 100 suns.
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Cool stars emit a great deal of ultraviolet radiation that you can't see, and hot stars emit plenty of infrared radiation
Indicate whether the statement is true or false
In the context of spectral classes, which of the following statements is true of T dwarfs?
A) They are a spectral class of red giant stars. B) They are hotter than L dwarfs. C) They are a spectral class of white giant stars. D) They are fainter than L dwarfs.
When you shake an apple to and fro, you're shaking
A) energy. B) nothing. C) the universe.
When you drag a toy teddy bear along the floor by a force that is parallel to the floor, the magnitude of the force of friction
a. is independent of velocity or acceleration. b. increases when the velocity increases. c. is proportional to the acceleration. d. decreases when the force parallel to the floor increases. e. increases when the force parallel to the floor increases.