Problem A 7-in connecting rod in an engine connects the wrist pin of a piston at point A to the end of a second rod at point B on the crankshaft. As the piston moves forward and back, the crankshaft is turned counterclockwise around point C. The stroke length of the engine is the distance that the piston travels (one way) within its cylinder. If the stroke length is 4 in., and the engine turns at 1800 rpm, write a model representing the distance d (in inches) from A to the center of the crank shaft C as a function of the time t (in minutes). Assume that at t=0, the piston is at its farthest point from the crankshaft. 7 in ! B 4 in. stroke length