The amount of light from an incandescent lamp that is transmitted through an ideal Polaroid filter is half, and through a real Polaroid filter is
A) less than half.
B) more than half.
C) half.
Answer: A
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You are standing near a railroad track and a train is moving toward you at 60 mph and blowing its horn. What will you notice as the train moves past you?
a. As the train approaches, the horn will sound lower in pitch than when the train is moving away. b. As the train approaches, the horn will sound higher in pitch than when the train is moving away. c. There will be no change in the pitch of the horn as it moves by. d. The horn will get louder as the train moves away from you. e. The horn will get quieter as the train moves toward you.
Relate meteor showers to comets; explain why most are annual events
What will be an ideal response?
Three point charges are positioned on the x axis. If the charges and corresponding positions are +32 ?C at x = 0, +20 ?C at x = 40 cm, and ?60 ?C at x = 60 cm, what is the magnitude of the electrostatic force on the +32-?C charge?
a. 84 N b. 12 N c. 36 N d. 50 N e. 48 N
When gas in a container is squeezed to half its volume, its density is
1) halved, 2) unchanged, 3) doubled, 4) quadrupled, and neglecting any temperature changes we would find the gas pressure to be 5) halved. 6) unchanged. 7) doubled. 8) quadrupled.