Laptop computers are made with batteries, but they must also be plugged into outlets to charge the batteries. which is true regarding laptops? 1.they run only on alternating current.2.they run only on direct current.3.they can run on either direct or alternating current.4.they do not run on direct or alternating current.

What is the angular momentum of the bar about the axle?

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.

Contains chemical energy. a. heat b. light c. natural gas