Hail comes straight down at a mass rate of m/δt = 0.050 kg/s and an initial velocity of v0 = -15 m/s and strikes the roof perpendicularly. unlike rain, hail usually does not come to rest after striking a surface. instead, the hailstones bounce off the roof of the car. suppose that the hail bounces off the roof of the car with a velocity of +15 m/s. ignoring the weight of the hailstones, calculate the force exerted by the hail on the roof.

Six solutions are made, each with a y concentration of 1.0 μm and varying concentrations of ab as shown below. based on the concentrations, rank the solutions in decreasing order of reaction rate.

Suppose that an electromagnetic wave which is linearly polarized along the x−axis is propagating in vacuum along the z−axis. the wave is incident on a conductor which is placed at z > 0 region of the space. the conductor has conductivity σ, magnetic permeability µ and electric permittivity ε. (a) find the characteristic time for the free charge density which dissipates at the conductor. (b) write the maxwell equations and derive the wave equation for a plane wave propagating in a conductor. (c) find the attenuation distance at which the incident amplitude reduces to e ^−1 of its initial value. (d) find the electric and magnetic fields inside the conductor. 8 (e) find the power loss per area of the incident electromagnetic wave at the surface of conductor.

When you push downward on a book at rest on a table, you feel an upward force. does this force depend on friction? defend your answer.