Tile uldgram below shows some positions in the path of a pendulum swinging from a
fixed point called a fulcrum.
Fulcrum
Start
The pendulum is raised to the start position and released. At which two numbered
positions is the potential energy of the pendulum most likely the same?
A
position 1 and position 3
®
position 1 and position 4
©
position 2 and position 3
position 2 and position 4
ОА
Ос
ор

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.