If the vectors 
and 
have magnitudes of 10 and 11, respectively, and the scalar product of these two vectors is ?100, what is the magnitude of the sum of these two vectors?
A. 6.6
B. 4.6
C. 8.3
D. 9.8
E. 7.6
Answer: B
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Free Fall: Ball A is dropped from the top of a building. One second later, ball B is dropped from the same building. Neglect air resistance. As time progresses, the difference in their speeds
A. increases. B. remains constant. C. decreases. D. cannot be determined from the information given.
Scattered light in the atmosphere is often partially polarized. The best way to determine whether or not light from a particular direction in the sky shows polarization is to
A. diffract the light through a single slit. B. squint while looking in that direction. C. rotate a piece of polaroid film about an axis parallel to the ray while looking through it in that sky direction. D. rotate a piece of polaroid film about an axis perpendicular to the ray while looking through it in that sky direction. E. reflect the rays from that direction on a shiny metal surface.
When de Broglie's matter waves are applied to electrons in the Bohr atom, which of the following occurs?
A knight on horseback holds a 10-m lance. The horse can run at 0.78c. (It wins most of its races!) How long will the lance appear to a person that is standing still on the ground as the horse runs past?
a. 7.1 m c. 10 m b. 15 m d. 6.3 m