1. Describe the universal gravitational law.
2. Evaluate the techniques and models used by Ptolemy and Copern
the universe.
3. A child picks up a tennis ball tied to the end of a rope. He swings th
head, in a circle. Once the ball is spinning, he lets go of the string and
which of the following images correctly shows which way the ball will
Ball at moment of release
Ball

A1500 w electric heater is plugged into the outlet of a 120 v circuit that has a 20 a circuit breaker. you plug an electric hair dryer into the same outlet. the hair dryer has power settings of 600 w, 900 w , 1200 w, and 1500 w. you start with the hair dryer on the 600 w setting and increase the power setting until the circuit breaker trips. under what setting does the circuit breaker trip.