A4-m long plank with a weight of 80 N is placed on a dock with 1m of its length extended over the water. The plank is uniform in density so thatthe center of gravity of the plank is located at the center of theplank. A boy with a weight og 150 N is standing on the plank and moving out slowly form the edge of dock.
a.what is the torque exerted by the weight of the plank about the pivot point at the edge of the dock?(treat all the weight as acting throughout the center of gravity of the plank)
b.how far from the edge f the dock can theboy move until the plank is just on the verge of tipping?
c.how can the boy test this conclusion without falling in the water?Explain