As soon as a ball rolls off the edge of a table
A) it is not acted on by any forces.
B) it is not acted on by any horizontal forces.
C) has a zero net force acting on it.
D) none of the above
Answer: B
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Consider a rock interacting gravitationally with the earth, and choose the interaction’s potential energy to be zero if the rock is at the ground level. A person standing at the bottom of a well throws the rock vertically upward from 20 m below ground level. The rock makes it all the way up to 1 m below ground level before falling back into the well. The total energy of the rock–earth system is
A. negative. B. zero. C. positive (in this particular case). D. positive (because energy is always positive). E. The answer depends on information not specified.
How did astronomers discover the relationship between spectral type and mass for main sequence stars?
A) by measuring the masses and spectral types of main-sequence stars in binary systems B) by using computer models of hydrogen fusion and stellar structure C) by measuring stellar radii with powerful telescopes D) by comparing stars with the same spectral type but different luminosities
When it is summer in Australia, the season in the United States is
A. winter B. summer C. spring
A series circuit has equal values for resistance, capacitive reactance, and inductive reactance. The phase angle for this circuit is:
a. 60°. b. –60°. c. 180°. d. not given.