You put this rod under scanning electron microscope and you found a crack on the surface. You would like to determine the maximum allowable surface crack length by assuming that the applied tensile strength was a critical stress. Determine the maximum allowable surface crack length if the surface energy is 0.5 J/m2

Aball has an initial velocity of 3 m/s. if there is no friction, what is the highest it could roll?

What are the north and south poles of a solenoid change with?

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.