Which has the larger resistance, a 60-W or a 100-W incandescent lamp, both rated for 120-V operation?
A) 60-W lamp
B) 100-W lamp
C) both the same
Answer: A
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A tiny gun made of a strong but very light material fires a bullet more massive than the gun itself. For such a weapon
A) the target would be safer than the shooter. B) recoil problems would be lessened. C) conservation of energy would not hold. D) conservation of momentum would not hold. E) both conservation of energy and momentum would not hold.
Observer A sees a pendulum oscillating back and forth in a relativistic rocket and measures its period to be TA. Observer B moves along with the rocket and measures the period of the pendulum to be TB
What is true about these two time measurements? A) TA > TB B) TA = TB C) TA < TB D) TA could be greater or smaller than TB depending on the direction of the motion.
A rainbow shows separate colors of the spectrum because, at raindrop surfaces,
A. blue light is bent more than red light. B. all colors are bent the same, hence the separation. C. green light is bent more than blue light. D. red light is bent more than green light.
Alternating current has an advantage over direct current because ________
a. one can step up the voltage that one can use b. batteries can be displaced in most circuits c. electrical generators can be made to function d. incandescent lights will only work with AC