Gas molecules, each of mass 8.0 × 10–26 kg, collide with the sides of a cube. The average speed of the molecules perpendicular to the side is 550 m s–1 both before and after they collide.

If the force on one side of the box is 0.10 N, how many molecules collide every second?

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.