Before it ejects a planetary nebula, a star is a
a. red giant.
b. black hole.
c. white dwarf.
d. supernova.
a
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A white dwarf generates energy through ____
a. gravitational contraction b. hydrogen fusion c. helium fusion d. mass loss e. rapid rotation
Suppose that a particular chemical substance A is "pure" [contains no "impurities"], and that it can be chemically decomposed into two other pure materials B and C. What conclusion can be draw from this?
A) B and C must be elements. B) A must be a chemical compound. C) A must be an element. D) B and C must be chemical compounds. E) Nonsense--it is impossible to decompose a pure substance into two other materials.
What is the magnitude of the momentum of a 0.140 kg baseball traveling at 45.0 m/s?
What will be an ideal response?
A 50-kg satellite circles the Earth in an orbit with a period of 120 min. What minimum energy is required to change the orbit to another circular orbit with a period of 180 min? (Earth: radius = 6.4 × 10^6 m, mass = 6.0 × 10^24 kg)
a. 2.9 × 10^8 J b. 3.5 × 10^8 J c. 4.1 × 10^8 J d. 4.7 × 10^8 J e. 5.9 × 10^8 J