The distance between Earth and the Moon was determined by measuring the time it took for light waves from Earth to travel to the Moon and back. Why was it not possible to use sound waves for this experiment?

Give two examples of common force fields and name the sources of these fields.

Oil can be used to reduce friction. true or fales take 100 mark for solving gg

If you are reading a book and you move twice as far away from the light source, how does the brightness at the new distance compare with that at the old distance? It is

Which of the following describes the efficiency of real machines? A. Efficiency is 100% B. IMA is always larger than the AMA C. IMA is always smaller than the AMA D. IMA is equal to the AMA

A raindrop, mysteriously, falling on the Moon, hits thesurface at 57.4 m/s. The Moon's gravity is 1.6 m/s/s. Determine thetime that the drop is falling.

Which of the two resistors dissipates the larger amount of power?

Three students derive the following equations in which x refers to distance traveled, v the speed, a the acceleration (m/s^2), and t the time, and the subscript (0) means a quantity at time t=0: a) x=vt^2 + 2at, b) x=v0t+1/2at^2, and c) x=v0t+2at^2.

Which is a use of fiber optics?

When a positively charged conductor touches a neutral conductor, the neutral conductor will:

Definition of the rule E=mc^2