"My distance to the center of the earth is about 4000 miles when I am on the surface. If I go to a height of 8000 miles above the surface of the earth, the force of gravity then becomes what fraction of my present weight?"

What happens in a global convection cell

If a substance is in the gas phase, which of qualities of the gas will stay constant? a: volume b: mass c: shape d: position of particles

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