A sample of highly-radioactive material is somewhat
A) warmer than the environment.
B) cooler than the environment.
C) neither of these
Answer: A
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Vision Problems: As a treatment for cataracts (a cloudiness of the lens of the eye), the natural lens is removed and a plastic lens is implanted. After this is done a person can see distant objects clearly, but he cannot accommodate to focus on nearby objects. If such a person wanted to read a book at a distance of 25 cm, he would have to wear contact lenses having a diopter power of
A. +2.78 diopters B. +3.33 diopters C. -1.78 diopters D. +4.00 diopters E. -4.00 diopters
A polar orbiting satellite in ascending mode travels in which direction?
a. ?South to north b. ?West to east c. ?East to west d. ?North to south
Which produces more force: driving into a very massive concrete wall with no "give," or having a head-on collision with an identical car moving toward you at the same speed?
A) car B) wall C) both the same D) need more information
In an AC series circuit, the current in a pure resistor differs in phase with the applied voltage by what angle?
a. 180° c. 90° b. zero d. 45°