An object at the surface of the Earth (thus, a distance R from the center of the Earth)
weighs 160 N. Its weight at a distance 4R
from the center of the Earth is:
1. 10 N
2. 2560 N
3. 640 N
4. 160 N
5. 40 N

Astone is thrown into a pond. what happens to the amplitude of the resulting waves as they get farther from the point where the stone hit the water? explain.

Which statement is true if the refractive index of medium a is greater than that of medium b? a. total internal reflection is possible when light travels from air to medium b to medium a. b. total internal reflection is possible when light travels from medium a to medium b. c. total internal reflection is possible when light travels from medium b to medium a. d. total internal reflection is possible when light travels from air to medium a. e. total internal reflection is possible when light travels from air to medium b.

How does the strength of the electrostatic force between an electron and a proton compare to the strength of the gravitational force between them?