Where do stars form and why?
A) Stars form around giant planets because planets provide the "seeds" of star formation.
B) Stars form in cold gas clouds because gravity has to be stronger than gas pressure.
C) Stars form in warm dust clouds because the dust shields the protostars from radiation.
D) Stars form in hot gas clouds because stars have to be hot to start fusion reactions.
B) Stars form in cold gas clouds because gravity has to be stronger than gas pressure.
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Which one of the following particles can interact with all 4 of the known forces?
A) muon B) anti-proton C) electron D) neutrino E) graviton
Light is refracted through a diamond. If the angle of incidence is 30°, and the angle of refraction is 12°, what is the index of refraction?
a. 1.3 b. 2.4 c. 2.6 d. 1.8 e. 0.4
What is the net force on a 10-kg solid steel sphere falling in air at terminal speed?
a. 980 N b. 200 N c. 98 N d. 49 N e. Some value other than those given above.
Which of the following wavelengths is common to a 10 cm tube open at both ends and a 15 cm tube open at one end and closed at the other?
1.60 cm 2.30 cm 3.20 cm 4.15 cm 5.5 cm 6.Two of the above 7.Three of the above 8.None of the above