Auniform plane wave in air with e_i(z) = a_xe_0 exp (-jbeta_0z) impinges normally on the surface at z = 0 of a highly conducting medium having constitutive parameters , mu and a . find the reflection coefficient. derive the expression for the fraction of the incident power absorbed by the conducting medium. obtain the fraction of the power absorbed at 1 (mhz) if the medium is iron.

If it takes a planet 2.8 x 10^8 s to orbit a star with a mass of 6.2 x 10^30 kg what is the average distance between the planet and the star

Visualize the problem and identify special cases first examine the problem by drawing a picture and visualizing the motion. apply newton's 2nd law, ∑f⃗ =ma⃗ , to each body in your mind. don't worry about which quantities are given. think about the forces on each body: how are these consistent with the direction of the acceleration for that body? can you think of any special cases that you can solve quickly now and use to test your understanding later? one special case in this problem is if m2=0, in which case block 1 would simply fall freely under the acceleration of gravity: a⃗ 1=−gj^.

Which planets are visible without a telescope