Magnetic fields are produced either by electric currents or time-varying electric fields.

a. True

b. False

An electron in a television tube is accelerated uniformly from rest to a speed of 8.4/times 10^7~/text{m/s}8.4*10 7 m/s over a distance of 2.5 cm. What is the instantaneous power delivered to the electron at the instant that its displacement is 1.

A 96lb boy is standing in an elevator. Find the force on the boy's feet when the elevator (a) stands still (b) moves downward at a constant velocity of 3 ft/d (c) accelerates downward with an acceleration of 4.

A car is at rest at a red light. When the light turns green, it accelerates to a final velocity of 30 m/s. If the car traveled 100 m, what is the magnitude of the acceleration

What is the main thing that holds soil in place?

A pair of electrically charged objects attract each other with a force of 4 N when they are a distance of 3 m apart. If their charges stay the same, then what will be the attractive force between them when they are 6 m apart

What could result if the liver was not working properly?

A machine gun fires 10 rounds per second. The speed of the bullets is 300 m/s. What is the distance between the flying bullets?

A runner with a mass of 75kg runs 6m/s calculate the kinetic energy stored in the runner

Watt which is a unit of power is equal to

A certain wave has a wavelength of 35 meters and a frequency of 4.0hz. What is the speed of the wave