Skiers in a chairlift are on a 900 meter slope that is inclined at 30 degrees. Assume that for a single rider, it is necessary to lift 70kg of mass to the top of the lift. 12 riders per minute arrive at the top of the lift under maximum load conditions. If half of the energy supplied by the motor goes to overcoming friction, what average power must the motor supply?

molecules are free to separate from each other and will take on the shape of the container. molecules move completely at random and high speeds. they vibrate in a fixed position and do not move around much. molecules expand to the edge of their container.

pythagoras' theorem

square root (-5^2+9^2)

square root (25+81)

square root (106)

angle is tan^-1(9/5)

neg x, pos y

one "light year" is the distance that light travels, through vacuum, in one julian year.   that's 365.25 days, of 24 hours each.