An electromagnetic plane wave has an electric field that is parallel to the y axis, and has a Poynting vector given by (x, t) = (110 W/m^2) cos2(kx - ωt)î where x is in meters, k = 14.0 rad/m, ω = 4.20 x10^9 rad/s, and t is in seconds.

a. What is the direction of propagation of the wave?
b. Find the wavelength and the frequency of the wave.
c. Find the electric and magnetic fields of the wave as functions of x and t.

A58-kg boy swings a baseball bat, which causes a 0.140-kg baseball to move toward third base with a velocity of 38.0 m/s.

You want to lose weight and have been trying to decide which type of fad diet is best for you. you ask your doctor, who responds that a. fad diets are a temporary fix but generally don't have any side effects b. fad diets can be used several times a year to maintain a healthy weight c. fad diets can be risky for your health and, in the long run, do not work d. fad diets should never be used one right after the other; there should be a break between them select the best answer from the choices provided. a b c d

Which type of reaction is shown in this energy diagram ?