0.500 kg ball traveling at 1.00 m/s to the right hits a second ball of equal mass that is initially at rest. after the perfectly elastic collision, the second ball travels at 0.543 m/s at a 57.2o angle upward from the point of contact.
draw a before and after diagram of this collision.
write the momentum equations in both the x and y direction.
using the information from the previous problem, determine the speed and angle of the first ball.

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.

Which changes of state do the labels represent? a: b: c:

Lightning is an example of what phenomenon? a release of a large amount of energyan absorption of a large amount of energya natural electric circuita natural electric current