James and juan were at the highest point in the football stadium, dropping water balloons on people below. many of the balloons did not break, so the boys added more water to the balloons. what impact did adding water have on the balloons' potential energy? a) it had no impact; it just made the balloons bigger. b) the gravitational potential energy increased because the mass increased. c) the gravitational potential energy decreased because the diameter increased. d) the gravitational potential energy remained constant because they did not increase the height.

You have been called to testify as an expert witness in a trial involving a head-on collision. car a weighs 1515 lb and was traveling eastward. car b weighs 1125 lb and was traveling westward at 44.0 mph. the cars locked bumpers and slid eastward with their wheels locked for 22.5 ft before stopping. you have measured the coefficient of kinetic friction between the tires and the pavement to be 0.750 . how fast (in miles per hour) was car a traveling just before the collision? (this problem uses english units because they would be used in a u.s. legal proceeding.)

The slotted link is pinned at o, and as a result of rotation it drives the peg p along the horizontal guide. compute the magnitude of the velocity and acceleration of p along the horizontal guide. compute the magnitudes of the velocity and acceleration of p as a function of θ if θ=(3t) rad, where t is measured in seconds.

If the new moon happens on january 15th, what shape will it be on february 6th?