Two people, each of 70 kg mass, are riding in an elevator. One is standing on the floor. The other is hanging on a rope suspended from the ceiling. Compare the acceleration
of the first person to the acceleration 
of the second person. Which statement is correct?
a.
They are equal and opposite in direction.
b.
They are equal and have the same direction.
c.
The acceleration 
is greater than , but they have the same direction.
d.
The acceleration is greater than , but they have opposite directions.
e.
The acceleration >is less than , but they have the same direction.
b
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A mover slides a refrigerator 5 meters across a floor. If a force of 200 N was used, how much work was done?
Two point sources emit sound waves of 1.0-m wavelength. The sources, 2.0 m apart, as shown below, emit waves which are in phase with each other at the instant of emission. Where, along the line between the sources, are the waves out of phase with each other by ? radians?
A. x = 0, 1.0 m, 2.0 m B. x = 0.50 m, 1.5 m C. x = 0.50 m, 1.0 m, 1.5 m D. x = 0.75 m, 1.25 m E. x = 0.25 m, 0.75 m, 1.25 m, 1.75 m
Earth is made mostly of metals and rocks. Where did most of the elements that make up these materials (carbon, silicon, iron, etc.) form?
A) They were produced by the Big Bang. B) They were produced by chemical reactions in interstellar gas clouds. C) They were produced by stars. D) They were produced in our Sun. E) They were produced by nuclear fission of uranium and other radioactive materials in space.
Which of the following statements is incorrect?
a. Capacitance is always positive. b. The symbol for potential difference between the plates of a capacitor is . c. Water is a polar molecule. d. When a dielectric is placed in a capacitor it serves to reduce the electric field. e. Nonpolar molecules cannot be used for dielectric material in a capacitor.