Melting butter is a physical change. Which best describes what is happening? A. The butter changes into a different substance.
B. The butter contains a new arrangement of atoms.
C. The butter cannot turn into a solid again.
D. The butter no longer contains the same number of atoms.

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.

Anybody wanna ? (picture included? )

If the ama of the inclined plane below is 2, calculate the ima and efficiency. ima = efficiency =