Aweight lifter lifts a 345 n set of weights from ground level to a position over his head, a vertical distance of 1.89 m. how much work does the weight lifter do, assuming he moves the weights at constant speed?

Alfred pushes on a heavy box, but cannot move it. the box has a lot of inertia motion friction gravity

Debbie places two shopping carts in a cart corral she pushes the first cart which then pushes a second cart what force is being exerted

Which statement is true if the refractive index of medium a is greater than that of medium b? a. total internal reflection is possible when light travels from air to medium b to medium a. b. total internal reflection is possible when light travels from medium a to medium b. c. total internal reflection is possible when light travels from medium b to medium a. d. total internal reflection is possible when light travels from air to medium a. e. total internal reflection is possible when light travels from air to medium b.