A common pulley acts similar to a
A) hydraulic press.
B) gear.
C) common lever.
D) tension producer.
Answer: C
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A neutral atom always contains
a. the same number of protons as it does neutrons. b. the same number of electrons as it does neutrons. c. the same number of protons as it does electrons. d. twice as many protons as it does neutrons. e. twice as many neutrons as it does protons.
When waves from a pair of closely-spaced slits arrive out of phase
A) a bright fringe is produced. B) a dark fringe is produced. C) both bright and dark fringes are produced. D) none of the above
The type of EM radiation emitted when high speed electrons decelerate as they are smashed into a metal target is
a. ultraviolet. b. infrared. c. x-ray. d. microwave. e. gamma ray.
Lightning is dangerous to humans because lightning strokes
a. carry large currents c. have no resistance b. have high voltages d. fry whatever they hit