8. A spacecraft is in an elliptical orbit around the earth. At the time t=0 hours, it is at its apogee (highest point), 1000 km above the earth's surface. It is at its perigee (lowest point), 100 km above the surface 50 minutes later. Assuming that distance from the earth varies sinusoldally with time, write an equation and find the first 3 positive values of t for which the spacecraft is 200 km from the surface. Apogee Perigee

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Electromagnetic Waves

Electromagnetic waves are waves that consist of magnetic field and electric field components perpendicular to each other. These field components are also perpendicular to the direction of propagation of the wave.