A70 kg skydiver opens her parachute. the force due to air resistance is now 1200 n. what is the acceleration of the skydiver

Explain the doppler effect in terms of frequency, wavelength, and speed.

How much work would it take to move a coulomb charge across a 4 volt potential difference?

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.