Aplane electromagnetic wave varies sinusoidally at 90.0 mhz as it travels along +x direction. the peak value of the electric field is 1.00 mv/m, and it is directed along the +-y direction. (a) find the wavelength, the period, and the maximum value of the magnetic field.
(b) find the average power per unit area that this wave carries through space.
(c)find the average energy density in the radiation(in joules per cubic meter.)
(d) what radiation pressure would this eave exert upon a perfectly reflecting surface at normal incidence?

1point) a skydiver weighing 130 lb (including equipment) falls vertically downward from an altitude of 14,000 ft and opens the parachute after 20 s of free fall. assume that the force of air resistance, which is directed opposite to the velocity, is of magnitude 0.85|v|0.85|v| when the parachute is closed and is of magnitude 17|v|17|v| when the parachute is open, where the velocity vv is measured in ft/s. assume that acceleration due to gravity has magnitude 32 ft/s/s; remember that weight is the product of mass and gravitational acceleration. find the speed of the skydiver when the parachute opens. speed is 150.6121788 ft/s find the skydiver's height when the parachute opens. height is 2338.98591 ft find the limiting velocity vlvl after the parachute opens. (think about whether this should be positive or negative.) vl=vl= 7.647 ft/s

Free runners jump long distances and land on the ground or a wall. how do they apply newton’s second law to lessen the force of impact?

An object weigh 40n in air ,weigh 20n when submerged in water, and 30n when submerged in a liquid of unknown liquid density. what is the density of unknown of liquid?