If a force on an object is aimed perpendicular to the direction of the object's velocity, the force does
a. no work. b. positive work.
c. negative work. d. any of the above.
a
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If heat is flowing from a table to a block of ice moving across the table, which of the following must be true?
a. The table is rough, and there is friction between the table and ice. b. The ice is cooler than the table. c. The ice is changing phase. d. All three are possible, but none is absolutely necessary.
Is it possible to have a macroscopic sample of oxygen that has a mass of 14 atomic mass units?
A) Yes, but it would need to be made of oxygen atoms that each had less than the normal number of neutrons. B) No, this is less than than the mass of a single oxygen atom. C) Yes, but it would have the same density as nitrogen. D) No, because oxygen is a gas at room temperature.
A compass needle points to the North Star.
Answer the following statement true (T) or false (F)
During its early history, matter dominated the Universe
a. True b. False Indicate whether the statement is true or false