A heavily loaded boat is floating in a pond. The boat starts to sink because of a leak but quick action plugging the leak stops the boat from going under although it is now deeper in the water. What happens to the surface level of the pond?
a. It stays the same.
b. It goes up.
c. It goes down.
d. More information is needed to reach a conclusion.
a
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Total Internal Reflection: An optic fiber is made of clear plastic with an index of refraction of 1.50. For what range of angles of incidence ? with the lateral surface of the fiber will light remain inside the plastic "guide" if it is surrounded by air?
A. 21.1° < ? < 90° B. 23.4° < ? < 90° C. 38.3° < ? < 90° D. 40.3° < ? < 90° E. 41.8° < ? < 90°
Vision Problems: A myopic (nearsighted) child wears contact lenses that allow her to have clear distant vision. The power of the lenses of her eyeglasses is -3.00 diopters. Without the corrective lenses, what is the far point of the girl?
A. 0.33 m B. 0.25 m C. 0.17 m D. 0.42 m E. 0.50 m
Cosmic rays penetrate your body when
A) safely in your home. B) outdoors. C) in mountainous regions. D) all of the above E) none of the above
Whenever a gas is compressed,
A. heat must leave the gas. B. the temperature of the gas must get smaller. C. its internal energy must get smaller. D. work must be done on the gas.