fter a 0.385-kg rubber ball is dropped from a window on the third floor of the UAlbany Physics Building from a height of 18.5 m, it bounces off the concrete of the Podium surface and rebounds to a height of 15.0 m. (a) Determine the magnitude and direction of the impulse delivered to the ball by the floor. magnitude kg · m/s direction up (b) Estimate the time the ball is in contact with the floor to be 0.04 seconds. Calculate the average force the floor exerts on the ball. magnitude N direction up

Apositive point charge q is fixed on a very large horizontal frictionless tabletop. a second positive point charge q is released from rest near the stationary charge and is free to move. which statement best describes the motion of q after it is released? assume q stays on the table

Awind turbine is initially spinning at a constant angular speed. as the wind's strength gradually increases, the turbine experiences a constant angular acceleration 0.173 rad/s2. after making 2870 revolutions, its angular speed is 132 rad/s. (a) what is the initial angular velocity of the turbine? (b) how much time elapses while the turbine is speeding up?

Aperson gives a shopping cart an initial push along a horizontal floor to get it moving, and then lets go. the cart travels forward along the floor, gradually slowing as it moves. consider the horizontal force(s) on the cart while it is moving forward and slowing. which of the following statements is correct? (a) both a forward and a backward force are acting on the cart, but the forward force is larger. (b) only a forward force is acting which diminishes with time. (c) both a forward and a backward force are acting on the cart, but the backward force is larger. (d) only a backward force is acting, no forward force.