Spherical Mirrors: An object that is 10.0 cm tall is placed 37.0 cm in front of a concave mirror of focal length 18.5 cm. How tall is the image?
A. 2.5 cm
B. 5.0 cm
C. 7.5 cm
D. 20.0 cm
E. 10.0 cm
Answer: E
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In a laboratory experiment, you are given two unknown substances and a laser. One of the substances is a liquid in which you place the laser. The other is a tank made of a transparent solid. You aim the laser downward at the tank bottom – and find that the reflected ray is fully polarized when the angle of incidence is 54o. What is the transmitted angle for the ray transmitted into the tank bottom?
A. 
B. 
C. can’t answer this without knowing the indices of refraction.
D. 
Two speakers are emitting coherent sound waves at a frequency of 440 Hz. If the speed of sound is 343 m/s, and it is observed that no sound is heard a distance of 17.2 m from one speaker, which of the following is a possible distance to the second speaker?
A. 14.6 m B. 17.2 m C. 19.6 m D. 18.8 m E. 16.5 m F. 18.0 m
Why does Earth have an ultraviolet-absorbing stratosphere, while Venus and Mars do not?
What will be an ideal response?
The kinetic energy of an object is quadrupled. Its momentum will change by what factor?
a. zero c. eight b. two d. four