Which of theses statements are true about the theory of plate tectonics and the theory of continental drift a) the theory of plate tectonics doesn't explain how continental movements could occur b) the theory of tectonics tells exactly where the continents were before pangaea divided c) the theory of plate tectonics proves the theory of continental drift completely wrong d) the theory of plate tectonics gives the method by which continents can move as part of plates

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.

Along the line connecting the two charges, at what distance from the charge q1 is the total electric field from the two charges zero? express your answer in terms of some or all of the variables s, q1, q2 and k =14ï€ïµ0. if your answer is difficult to enter, consider simplifying it, as it can be made relatively simple with some work.

4. if you were an astronaut on the moon, what would you experience? what would you see from your perspective?