The heating element in an automobile window
has a resistance of 1.2 ohms when operated at
12 volts. calculate the power dissipated in the
heating element. [show all work, including the
equation and substitution with units.]

There are 3 equations for power, P = VI = V^2/R = I^2/R

Given the values you have been given, we know we'll be using V^2/R.

Substituting the values in, we get:

P = 12^2/1.2 = 144/1.2 = 120W

If there was no gravity then their would be no downword force on the football to have it return the the grownd, and if there was no friction (mainly air friction) then there would be no opposing force the stop the ball from moving through the air allowing the ball to travle ∞.