A current of 2.0 A in the 100-turn primary of an ideal transformer causes 14 A to flow in the secondary. How many turns are in the secondary?
A) 700 B) 4 C) 114 D) 14
D
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Avogadro's number is related to the universal gas constant R and the number of moles n by:
a. NA = Rn b. NA = R/n c. NA = n/R d. Avogadro's number cannot be related to these two quantities alone.
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
An object of mass 5.0 kg revolves at 600 rpm in a horizontal circle of radius 1.5 m. Determine the
a) period of the object's motion in seconds, b) object's speed, c) magnitude of the centripetal acceleration, d) magnitude of the centripetal force acting on the object.
If you double the absolute temperature of an object, it will radiate energy
A) 16 times faster. B) 4 times faster. C) 32. times faster. D) 8 times faster. E) 2 times faster.