The maximum mass of a white dwarf is about ________ times the mass of the Sun
Fill in the blank(s) with correct word
1.4
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A large fan placed in a closed room is effective by enhancing
A) conduction. B) convection. C) sublimation. D) radiation.
If a star is located at 10 pc, which of the following statements is correct?
a. The star's apparent and absolute visual magnitudes are equal. b. The star's apparent and absolute visual magnitudes are 0. c. The star's apparent visual magnitude is –-1.1 whereas the absolute visual magnitude is –5 d. Two of the other choices are correct.
Why do we expect WIMPs to be distributed throughout galactic halos, rather than settled into the galaxy's disk?
A) WIMPs are light enough that they have expanded out into the halo. B) Shock waves from generations of supernovae have blown the WIMPs out into the halo. C) WIMPs annihilate when they come into contact with ordinary matter, such as stars. D) WIMPS cannot produce photons, therefore they rarely interact and exchange energy with other particles. E) WIMPs were produced in the early stages of galaxy evolution, and objects in the halo, such as globular clusters, were formed first.
A runner runs 10 m from the origin toward the WEST to point A. He then runs from point A 20 m more toward the WEST to point B. He then runs from point B 30 m more toward the EAST to point C. The runner's total displacement from the origin to point C is
A. 60 m toward the WEST. B. 50 m toward the EAST. C. 20 m toward the WEST. D. 10 m toward the EAST. E. 0 m.