Between Hawaii and California, trash swirls in giant ocean currents, caught up in the infamous, Texas-sized Great Pacific Garbage Patch. This is just one of many found across the globe. Efforts to ...

Gravitational potential energy is the energy an object has by virtue of its position above the surface of the Earth. When an object is lifted, work is done. When work is done in raising the height ...

Massachusetts Institute of Technology, Cambridge, Massachusetts, U.S.A.