Aproton accelerates from rest in a uniform electric field of 610 n/c. at some later time, its speed is 1.4 106 m/s.(a) find the magnitude of the acceleration of the proton.(b) how long does it take the proton to reach this speed? (c) how far has it moved in that interval? (d) what is its kinetic energy at the later time?

A150 w lamp emits light of wavelength 590 nm uniformly in all directions. what is the photon flux (photons per unit area per unit time) on a small screen at a distance 2.3 m from the lamp? assume the photons are uniformly distributed over the surface of a sphere of radius 2.3 m.

Petroleum contains energy. a. light b. kinetic c. chemical d. mechanical

Sally turns on her cellular telephone to speak to her friend who is located thousands of miles away. which of the following best describes how such a telephone is able to transmit and receive information? a. the cellular telephone transmits, receives, and encodes information using only sound waves. b. the cellular telephone transmits, receives, and encodes information using only electromagnetic waves. c. the cellular telephone transmits information by electromagnetic waves to a receiver which then encodes them and produces sound. d. the cellular telephone transmits information by sound waves to a receiver which then encodes them and produces electromagnetic waves.