The surface of Mars is surprisingly smooth and featureless
Indicate whether the statement is true or false
FALSE
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Which of the following situations represents a car whose speed is increasing?
A) A car covers equal distances in shorter and shorter times. B) In equal times, a car covers shorter and shorter distances. C) A car covers equal distances in equal times. D) A car takes longer and longer times to cover equal distances. E) None of the above.
The number of photons per second passing a plane perpendicular to a collimated monochromatic (one frequency) beam of light transporting power P is directly proportional to
a. the wavelength of the light. b. the frequency of the light. c. the power of the beam. d. all of the above. e. only (a) and (c) above.
When a 45-kg person steps on a scale in an elevator, the scale reads a steady 480 N. Which of the following statements must be true? (There could be more than one correct choice.)
A) The elevator is moving downward at a constant rate. B) The elevator is accelerating upward at a constant rate. C) The elevator is accelerating downward at a constant rate. D) The elevator is moving upward at a constant rate. E) From the given information, we cannot tell if the elevator is moving up or down.
A nonchemical combination of two or more substances in variable proportions is called
a. a mixture. b. a compound. c. an ion. d. a molecule.