Q. Two air carts of mass = 0.86 and = 0.47 are placed on a frictionless track. Cart 1 is at rest initially, and has a spring bumper with a force constant of 690 . Cart 2 has a flat metal surface for a bumper, and moves toward the bumper of the stationary cart with an initial speed = 0.63 . Assume that positive -axis is directed toward the direction of motion of cart 2.
Q. An emf is induced in a conductin loop of wire 1.03m long as its shape is changed from square to circular. Find the average magnitude of the induced emf if the change in shape occurs in 4.15s and the local 0.131-T magnetic field is perpendicular to the plane of the loop.