You are working as an intern for a meteorological laboratory. you are out in the field taking measurements with a device that measures electric fields. you measure the electric field in the air immediately above the earth's surface to be 119 n/c directed downward. (assume the radius of the earth is 6.37 ✕ 106 m.) (a) determine the surface charge density (in c/m2) on the ground. (b) imagine the surface charge density is uniform over the planet. determine the charge (in c) of the whole surface of the earth. (c) determine the earth's electric potential (in v) due to the charge found in (b). (d) determine the difference in potential (in v) between the head and the feet of a person 1.50 m tall. (ignore any charges in the atmosphere.) v

Ablock of mass m = 2.5 kg is attached to a spring with spring constant k = 710 n/m. it is initially at rest on an inclined plane that is at an angle of θ = 23° with respect to the horizontal, and the coefficient of kinetic friction between the block and the plane is μk = 0.19. in the initial position, where the spring is compressed by a distance of d = 0.16 m, the mass is at its lowest position and the spring is compressed the maximum amount. take the initial gravitational energy of the block as zero. a) what is the block's initial mechanical energy? b) if the spring pushes the block up the incline, what distance, l, in meters will the block travel before coming to rest? the spring remains attached to both the block and the fixed wall throughout its motion.

In the derivation of rrkm theory, a factor of 1/2 is introduced when equalizing the rates of formation and decomposition of activated complex as keal-hr) = ko this is clearly against the assumption of transition state theory that states all the activated complex in the transition state iss going to the product. find the reason why this factor is introduced here.

When the force acting on an object points at least partially in the direction of the motion the work done is considered to be negative