Energy can be described in many ways. from the list below, what is the best definition of energy? a) anything that brings about change. b) the ability to create a new substance. c) melting, freezing, or evaporating. d) the ability to do work.

An ideal transformer has 60 turns in its primary coil and 360 turns in its secondary coil. if the input rms voltage for the 60-turn coil is 120 v, what is the output rms voltage of the secondary coil?

Name three different units of energy used to measure heat and describe what type of situations each is usually used.

Unpolarized light of intensity i_0=750w/m^2 is incident upon two polarizers. after passing through both polarizers the intensity is i_2=280w/m^2. (a) what is the intensity of the light after it passes through the first polarizer in w/m^2? (b) write an equation for the angle between the polarizers in terms of the initial (i_0) and final (i_2) intensities. (c) find the angle between the polarizers in degrees.