If y = 0.02 sin (30x - 400t) (SI units), the angular frequency of the wave is
a. 30 rad/s
b. 30/2p rad/s
c. 400/2p rad/s
d. 400 rad/s
e. 40/3 rad/s
D
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Matter Waves: What is the de Broglie wavelength of a ball of mass 200 g moving at 30 m/s? (h = 6.626 × 10-34 J ? s)
A. 1.1 × 10-34 m B. 2.2 × 10-34 m C. 4.5 × 10-28 m D. 6.7 × 10-27 m
How can meteorites from the Moon or Mars have made it to Earth?
A) Impacts on those worlds blasted rocks into space that eventually fell to Earth. B) Those worlds spin rapidly enough to have sent some rocks from their surfaces into space. C) The meteorites from the Moon and Mars were never actually part of those worlds; they are just rocks that formed in the same vicinities of the solar system. D) The solar wind gradually blew material off of the surfaces of these worlds, and once in space it collected together to make the meteorites.
Suppose we make a scale model of our solar system, with the Sun the size of a grapefruit. Which of the following best describes what the planets would look like?
A) The planets are all much smaller than the Sun. Four planets are within about 20 meters of the Sun, while the rest planets are spread much farther apart. B) The planets are all much smaller than the Sun and are spread out evenly over a distance about the length of a large classroom. C) The planets are all much smaller than the Sun. Four planets are located within a few centimeters of the Sun, and four planets are located at distances ranging up to about a meter. D) The planets range in size from about the size of a marble to the size of a baseball. They are spread out over 100 meters.
The figure below shows a planet traveling in a clockwise direction on an elliptical path around a star located at one focus of the ellipse. When the planet is at point A,
A. its speed is constant. B. its speed is increasing. C. its speed is decreasing. D. its speed is a maximum. E. its speed is a minimum.