Why are force fields necessary to describe gravity?

A. gravity can only push objects apart

B. gravity is a type of air resistances

C. gravity acts between any two objects with charges

D. gravity is a non-contact force

14. Because violet light has more energy than red light, A. red light is less bright than violet light. B. violet light has a higher wave frequency than red light. C. the mass properties of light are invariable. D.

What is the difference between mass and weight. * there is no difference. weight is the amount of matter, and mass is the force due to gravity. mass is the amount of matter, and weight is the force due to gravity.

In Burglar alarm LDR acts as a/an a. off switch b. on switch c. AND gate d. OR gate

The objects listed are placed at the top of a ramp and roll down to the bottom without slipping. Assuming that there is no air resistance, rank them in order from fastest average rolling speed to slowest. a. large marble b. basteball c.

The integrated circuit and its ability to put a great deal of information on a small chip was the beginning of the idea of computers for personal use.

Imagine two artificial satellites orbiting earth at the same distance. one satellite has a greater mass then the other one which of the following would be true about there motion? 1.

What is energy? (Not the answer from google search.)

Explain why the friction force between two surfaces increases if the force is pushing the surfaces together increases.

As energy moves in waves through the water, the water moves a. in waves toward shore. c. in the direction of the waves. b. in a small circular movement. d. against the current.

Which of the following values represents an index of refraction of an actual material? A. 0 B. 1 / 4 C. 5 / 4 D. 1 / 2