Snell's Law: An oil layer that is 5.0 cm thick is spread smoothly and evenly over the surface of water on a windless day. A light ray from the air above enters the oil at 45° with the normal and then goes into the water. What is the angle of refraction of this ray in the water? The index of refraction for the oil is 1.15, and for water it is 1.33.
A. 27°
B. 32°
C. 36°
D. 39°
Answer: B
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Nuclear Reactions: Determine the missing product X in the following nuclear reaction:
U + neutron ? 
Ba + X + 3 neutrons
Fill in the blank(s) with the appropriate word(s).
Velma passes Mort at a high speed. Velma and Mort each have identical light-clocks. Mort and Velma both observe both clocks to "tick" simultaneously at 12 noon on both clocks. Mort observes that Velma's next tick occurs
A) only after the second drink. B) after his own clock ticks. C) before his own clock ticks. D) before or after or at the same time as his own tick, depending on Velma's precise speed. E) at the same time as the tick on his clock.
San Francisco Chef Manual rates the energy content of foods in units of
A) calories. B) Calories. C) joules. D) Celsius degrees.
An earthquake generates three kinds of waves: surface waves (L-waves), which are the slowest and weakest, shear (S) waves, which are transverse waves and carry most of the energy, and pressure (P) waves, which are longitudinal waves and are the
fastest. The speed of P waves is approximately 7 km/s, and that of S waves is about 4 km/s. People do not generally feel the P waves, but animals seem to be sensitive to them. If a person reports that her dog started barking 20 seconds "before the earthquake," then approximately how far was the origin of the earthquake? A) 100 km B) 200 km C) 300 km D) 400 km E) 500 km