A car travels in a circle with constant speed. the net force on the car is

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.

The voltage applied across a given parallel-plate capacitor is doubled. how is the energy stored in the capacitor affected?

Is there a point between a 10 nc charge and a 20 nc charge at which the electric field is zero?