Two truckers are traveling directly away from each other at the same speed. if one trucker sounds her horn at a frequency of 221 hz, and the other trucker hears a frequency of 210 hz, determine the speed of the trucks. use the speed of sound as 343 m/s.

Which explanation describes the forces involved for a person to walk down the sidewalk? a. the person's feet push backward on the sidewalk; the sidewalk pushes backward on the person. b. the person's feet push forward on the sidewalk; the sidewalk does not push on the person. c. the person's feet push backward on the sidewalk; the sidewalk pushes forward on the person. d. the person's feet push forward on the sidewalk; the sidewalk pushes forward on the person.

Because light travels in a straight line and casts a shadow, isaac newton hypothesized that light is

How can you increase the strength of an electromagnet?