All parts of the electromagnetic spectrum travel at a speed of 3 × 108 m/s when traveling through no medium. a "vacuum” means that there is no medium, such as a tube without any air in it. therefore, 3 × 108 m/s is said to be the speed of light in a vacuum. if an electromagnetic wave’s frequency doubles in a vacuum, what are the other effects on the wave?

Ascrew incorporates which other simple machine? lever wheel and axle inclined plane pulley

Each line (unit) on the horizontal axis represents: 5 years 10 years 20 years all of the above

Determine the time it takes for a satellite to orbit the earth in a circular "near-earth" orbit. the definition of "near-earth" orbit is one which is at a height above the surface of the earth which is small compared to the radius of the earth, so that you may take the acceleration due to gravity as essentially the same as that on the surface. does your result depend on the mass of the satellite?