Betty is sitting on of her surfboard out in the ocean. She is waiting for the perfect wave to come along so she can ride in it to shore. As she waits, she notices that the waves roll by in pattems, or sets. As the top of each wave passes by Betty, it pushes her up. Which part of the wave does this? a. compression
b. Crest
c. rarefaction
d. trough

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.