Can we say that the disturbance in a wave is caused by energy gained at one point in the system? Then it's that energy which propagates through the wave causing a disturbance?

How will the system respond to a temperature increase?

Two point charges are separated by a certain distance. how does the strength of the electric field produced by the first charge, at the position of the second charge, change if the second charge is doubled? a. the field does not change b. the field strength decreases by half. c. the field strength doubles d. the field strength quadruples

Two balls, each with a mass of 0.5 kg, collide on a pool table. is the law of conservation of momentum satisfied in the collision? explain why or why not