Two similar objects are moved by two bulldozers. If the work accomplished by bulldozer #2 was three times greater than bulldozer #1 then: Both bulldozers did equal work because the objects are similar. Bulldozer #2 had to move 3 times greater distance. Bulldozer # 1 had to move 3 times greater distance. Bulldozer #2 had to require 3 times greater power.

The heater element of a 120 v toaster is a 5.4 m length of nichrome wire, whose diameter is 0.48 mm. the resistivity of nichrome at the operating temperature of the toaster is 1.3 × 10-6 ω·m. the toaster is operated at a voltage of 120 v. (a) what is the power drawn by the toaster? (b) if the cost of electricity is 12 ¢ per kilowatt-hour, and it takes 2 minutes to toast bread, how much does it cost for toasted bread? (c) when the heater element is at room temperature, is the resistivity in the nichrome wire greater than, less than, or equal to it’s resistivity when at operating temperature? explain.