Aballoon used in surgical procedures is cylindrical in shape. as it expands outward, assume that the length remains a constant . find the rate of change of surface area with respect to radius when the radius is (answer can be left in terms of π).

Polly is pushing a box across the floor with a force of 30 n. the force of gravity is –8 n, and the normal force is 8 n. which value could describe the force of friction if polly could not move the box?

In a heat engine if 1000 j of heat enters the system the piston does 500 j of work, what is the final internal energy of the system if the initial energy was 2000 j? 1. write the equation 2.list out your known variables 3.plug the numbers into the equations 4.solve 5.write your solution statement that includes initial energy and final

Acar drives toward the right over the top of a hill, as shown below. which arrow represents the centripetal acceleration? w x y z