The ______________ surrounds the nucleus of a comet
a. head or coma
b. cloud
c. fuzz
d. cover
e. epinucleus
a
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Which system has the smallest total mass?
A. System A B. System B C. System C D. Systems A and B (which have equal total masses) E. Systems A and C (which have equal total masses) F. Systems B and C (which have equal total masses) T. All three systems have the same total mass.
2.20 kilograms of water at 1.00 atm at the boiling point of 100°C is heated until all the water vaporizes. What is its change in entropy? (For water, Lv = 2.26 × 10^6 J/kg)
a. 2.67E+4 J/K b. 1.33E+4 J/K c. 6.66E+3 J/K d. 4.44E+3 J/K e. 1.82E+4 J/K
Which of the following statements about electrons is not true?
A) They are composed of quarks. B) In an atom, an electron can have two possible values for its spin, usually called spin up and spin down. C) Electrons are one of the six known types of lepton. D) Electrons can behave both as particles and as waves.
A dust particle has a rest energy (mass) of 1.0 ?g. In joules, this rest energy is closer to:
A. 1017 J B. 1011 J C. 108 J D. 10-3 J E. 10-23 J F. Other (specify)