Popeye, of mass 70 kg, has just downed a can of spinach. He accelerates quickly and stops Bluto, of mass 700 kg (Bluto is very dense), who is charging in at 5.0 m/s. What was Popeye's remarkable speed?
a. 10 m/s
c. 50 m/s
b. 31 m/s
d. 100 m/s
C
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If ?o is less than one, then
A) only dark energy exists in the universe. B) there is more matter than energy in the universe. C) the universe will expand forever. D) the universe is closed, and must recycle. E) no matter could have existed.
Which of the following best describes the status of the Milky Way in our Local Group of galaxies?
A) It is one of the two largest galaxies in the group. B) It is one of about a dozen large spiral galaxies in the group. C) It is by far the largest galaxy in the group. D) It is quite average among the galaxies in the group.
Observed mall fluctuations in the temperature of the cosmic microwave background are predicted by dark energy models
Indicate whether the statement is true or false
A particle of light is called
A) a quark. B) a neutron. C) a photon. D) an electron. E) a proton.