What do cell phones require to work?

A. The GPS system

B. Ultraviolet rays

C. A cellular system

D. X-rays

Every 10 seconds a pendulum completes 2 cycles. what are the period and frequency of this pendulum?

What makes up everything in the universe name 2 properties of all?

Two balls undergo a perfectly elastic head-on collision, with one ball initially at rest. if the incoming ball has a speed of 200 m/s.

Which planet was studied by the mariner 10 probe and has a crater-covered surface?

What did J. J. Thomson observe when he applied electric voltage to a cathode ray tube in his famous experiment? A. The stream of cathode ray particles was moving very slowly. B. The glass opposite of the negative electrode started to glow. C.

Which theory was first proposed by Albert Einstein? A. the theory of special relativity B. the theory of universal gravitation C. the theory of inertia D. the theory of radioactivity ... the answer is A i just found out

For each of the following, describe the relationship as directly or inversely proportional: a) wavelength vs. frequency b) wavelength vs. energy c) frequency vs. energy ... ?

Can hand sanitizer be used as rubbing alcohol

Two objects experience a 12 N electrical force between them. What force will the objects experience if the distance between them is doubled?

a submarine moving directly upward in the water at constant speed. The weight of the summer and it is 500,000 N. The submarines motors are off. The magnitude of the buoyant force acting on the submarine is