Ablock rests on a wedge on a horizontal surface. the coefficient of friction of the block on the wedge is μ. gravity is directed down. the wedge angle θ obeys tan θ < μ. the wedge is accelerated horizontally at rate a. find the maximum and minimum values of a for the block to stay fixed on the plane.

Your physics assignment is to figure out a way to use electricity to launch a small 6.0-cm-long plastic drink stirrer. you decide that you'll charge the little plastic rod by rubbing it with fur, then hold it near a long, charged wire, as shown in figure p23.56 . when you let go, the electric force of the wire on the plastic rod will shoot it away. suppose you can uniformly charge the plastic stirrer to 10 nc and that the linear charge density of the long wire is 1.0 x10-7 c/m. what is the net electric force on the plastic stirrer if the end closest to the wire is 2.0 cm away?