According to Hubble's Law, the greater a galaxy's redshift, the
A) faster it's approaching us.
B) farther it is from us.
C) greater its mass.
D) closer it is to us.
E) younger it is.
B
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A(n) ____ contains two or more atoms that are bound together by exchanging or sharing electrons with each other
a. nucleus b. ion c. proton d. electron cloud e. molecule
A roller skate at rest may have
A) speed. B) velocity. C) momentum. D) energy.
A 1.0-kg chunk of ice at 0°C melts, absorbing 80,000 cal of heat in the process. Which of the following best describes what happens to this system?
a. increased entropy c. entropy maintained constant b. lost entropy d. work converted to energy
Why is there a radioactive source in a smoke detector?
a. It makes the smoke particles radioactive. b. It ionizes the air. c. It powers the alarm when the battery wears out. d. none of the above