An object moving at a constant speed requires 4.0 s to go once around a circle with a diameter of 5.0 m. what is the magnitude of the instantaneous acceleration of the particle during this time? o2.20 m/s2 3.93 m/s2 6.17 m/s2 12.3m/2 15.4 m/g2

Apossible explanation for a set of facts that can be tested by further investigation is called

An incident ray through the focal point of a spherical mirror will: reflect through the center of curvature. reflect back through the focal point. reflect parallel to the principle axis. reflect the same direction as the incident ray.

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.