To calculate the frequency of an electromagnetic wave, you need to know the speed of the wave and its
a. wavelength.
b. intensity.
c. refraction.
d. amplitude.

Aman throws a football straight into the air. as it rises, it slows down. which type of energy is the football gaining?

An electric clothes dryer has a resistance of 8 ohms. it draws 30 a of current. what is the voltage, in volts, of the wall outlet that it is plugged into?

Suppose that a mass of 2 kg is attached a spring whose spring constant is 50. the system is damped such that b = 12 . the mass is set in motion with an initial velocity of -8 m/s at a position 0 meters from equilibrium. set up and solve a differential equation that models this motion. write your solution in the form a cos ( ω t − α ) where α is a positive number. use your solution to fill in the information below: what is the amplitude of the motion? what is the value of ω ? what is the phase shift?