The small circles in the diagram below represent the positions along the x axis of a body at equal time intervals. Assume the body moves in a straight line





This diagram is most likely to describe





a.

a swimmer swimming laps.



b.

an exercise on a rowing machine.



c.

a person on a treadmill.



d.

a tennis ball during a volley.



e.

a runner who tripped, fell, rose, and continued racing.


e

Physics & Space Science

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Shield volcanoes, like those on Venus and Mars, occur ____

a. over a hot spot b. along a subduction zone c. Inside a chamber d. along plate boundaries e. within a caldera

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Star clusters are important to our study of stars because

a. all stars formed in star clusters. b. the sun was once a member of a globular cluster. c. they give us a method to test the our theories and models of stellar evolution. d. they are the only objects that contain Cepheid variables. e. all of the above

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When an atom emits a photon, the atom's mass

A) decreases slightly. B) remains exactly the same. C) increases slightly. D) could do any of the above. E) becomes negative--i.e., less than zero.

Physics & Space Science

The plot in the figure shows the potential energy of a particle, due to the force exerted on it by another particle, as a function of distance. At which of the three points labeled in the figure is the magnitude of the force on the particle greatest?

A) point X B) point Y C) point Z

Physics & Space Science