Kepler was able to mathematically model that what shape was the most likely orbital shape for objects around the sun?

In a voltaic cell, electrons flow from the (positive/negative) to the (positive/negative) terminal.

The slope of a velocity time graph over any interval of time gives the during that interval

1. jay fills a wagon with sand (about 20 kg) and pulls it with a rope 30 m along the beach. he holds the rope 25° above the horizontal. the rope exerts a 20-n tension force on the wagon. how much work does the rope do on the wagon?