Which of the following elements is a liquid at room temperature? A. Calcium B. Mercury C. Boron D. Phosphorous

1. a net force of 100 newton’s is applied to a wagon for 5 seconds. this causes the wagon to undergo a change in momentum of

In a good thermo flask the main cause of heat loss is

An athlete is holding 24 lb of weights at a height of 6 inches above the stack as shown. to lower the weights, she applies a constant force of 5 lb to the handle. determine the velocity of the weights immediately before they hit the stack.