If a certain resistor obeys Ohm's law, its resistance will change:
a. as the voltage across the resistor changes.
b. as the current through the resistor changes.
c. as the energy given off by the electrons in their collisions changes.
d. none of the above, since resistance is a constant for the given resistor.
d
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Uniform Circular Motion: When a car goes around a circular curve on a horizontal road at constant speed, what force causes it to follow the circular path?
A. the normal force from the road B. the friction force from the road C. gravity D. No force causes the car to do this because the car is traveling at constant speed and therefore has no acceleration.
A convex lens is placed on a flat glass plate and illuminated from above with monochromatic red light. When viewed from above, concentric bands of red and dark are observed
What does one observe at the exact center of the lens where the lens and the glass plate are in direct contact? A) a bright red spot B) a dark spot C) a rainbow of color D) a bright spot that is some color other than red
Which of these lamps employs semi-conductor technology?
A) incandescent lamp B) fluorescent lamp C) CFL D) LED
The closest planet to Earth is
a. Mars. b. Venus. c. Mercury. d. Saturn.