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K-12 Physics 21-23
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A train travelled 35 of a journey in 6 hours. Then it traveled the
remaining 300 miles in 4 hours. What was the total average speed for
the whole journey
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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.

The transfer of heat through the movement of a gas or liquid a. convection b. conduction c. radiation

Does anyone have the answers to online physics course plato course physics, semester a v3.0