the temperatures of sun is doubled then heat energy the temperatures of sun is doubled then heat energy incident of earth surface will increase by a factor of ​

Simple machines can a. increase force only b. decrease force only c. increase or decrease force

Which diagram correctly demonstrates the various forces acting on a ball moving horizontally with some speed?

Awater slide of length l has a vertical drop of h. abby's mass is m. an average friction force of magnitude f opposes her motion. she starts down the slide at initial speed vi. use work-energy ideas to develop an expression for her speed at the bottom of the slide. then evaluate your result using unit analysis and limiting case analysis. express your answer in terms of the variables h, m, l, vi, f and appropriate constants. vf v f