A nova is almost always associated with
a. a very massive star.
b. a very young star.
c. a star undergoing helium flash.
d. a white dwarf in a close binary system.
e. a solar like star that has exhausted its hydrogen and helium.
D
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At extremely high temperatures (e.g., millions of degrees), which of the following best describes the phase of matter?
A) a gas of rapidly moving molecules B) a plasma consisting of positively charged ions and free electrons C) a gas consisting of individual, neutral atoms, but no molecules D) a plasma consisting of rapidly moving, neutral atoms E) none of the above (At these extremely high temperatures, matter cannot exist.)
Stars nearby to our sun have an average relative speed of about 70,000 km/hour. How fast is that in km/s?
A) about 3000 km/s B) about 20 km/s C) about 1200 km/s D) about 4.2 million km/s
A wheel rotating about a fixed axis has a constant angular acceleration of 4.0 rad/s2 . In a 4.0-s interval the wheel turns through an angle of 80 radians. Assuming the wheel started from rest, how long had it been in motion at the start of the 4.0-s interval?
a. 2.5 s b. 4.0 s c. 3.5 s d. 3.0 s e. 4.5 s
The two jovian planets that contain the highest proportions of hydrogen compounds are
A. Saturn and Neptune B. Jupiter and Neptune C. Jupiter and Saturn D. Saturn and Uranus E. Uranus and Neptune F. Jupiter and Uranus