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.

An object resting on a table weighs 100 n. with what force is the object pushing on the table? with what force is the table pushing on the object? explain how you got your answer.

1kg of water needs to recieve 4200j of energy to go from 90 degrees to 91 degrees. what is the specific heat capacity of water? what are the units?

Apotter's wheel moves uniformly from rest to an angular speed of 0.20 rev/s in 32.0 s. (a) find its angular acceleration in radians per second per second. rad/s2 (b) would doubling the angular acceleration during the given period have doubled final angular speed?