The function y(x, t) = (25.0 cm) cos(πx - 27πt), with x in meters and t in seconds, describes a wave on a taut string. what is the transverse speed for a point on the string at an instant when that point has the displacement y = +22.0 cm?

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.