A 200 kg rollercoaster car is located at the top of a hill where the height is 30m. What is the velocity when it reaches the bottom of the hill?

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.

Diamond will scratch quartz. true or false

Examples of states of consciousness include a. daydreaming b. dreaming during sleep c. hypnosis d. all of the above