Arollercoaster starts at a height of 30m above the ground. at the bottom of a loop. the rollercoaster is at a height of 10m. approximately, how much gravitational potential energy is lost by a 75kg rider?
a. 19.6 joules. eliminate.
b. 1470 joules.
c. 14,700 joules
d. 22,050 joules

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.