Which of the following has the greater weight?
1) 1 kilogram of gold
2) 1 kilogram of feathers
3) both weigh the same in the same locality
This follows from the fact that
4) gold is more compact than feathers.
5) weight and mass are directly proportional to each other.
Answer: 3, 5
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Single-Slit Diffraction: If a sheet containing a single slit is heated (without damaging it) and therefore expands, what happens to the angular location of the first-order diffraction minimum?
A. It moves toward the centerline. B. It moves away from the centerline. C. It doesn't change.
Suppose a ball is dropped from shoulder height, falls, makes a perfectly elastic collision with the floor, and rebounds to shoulder height. Compare the magnitudes of the impulses delivered to the ball by gravity and by the floor during this entire motion.
A. The floor delivers an upward impulse, but gravity does not deliver a total impulse B. The two impulses have the same magnitude C. The impulse delivered by the floor is half as large as the impulse delivered by gravity D. The impulse delivered by the floor is twice as large as the impulse delivered by gravity
Which of the following can you never know about a black hole?
a. Mass b. Rotation c. Electrical charge d. The elements of the material that has fallen in.
Polarization involves
a. the orientation of field vectors. b. only longitudinal waves. c. diffraction. d. interference.