Consider a hot air balloon floating 3000 m above the ground. If the basket has a mass of 80 kg, and the mass of the people flying it totals 375 kg, what is the potential energy of the hot air balloon basket? A.) 109,200,000 J
B.) 90,000,000 J
C.) 13,377,000 J
D.) 3.14 J

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.

Compare the patterns of the two waves shown in the image. which statement is true about these waves?

Resistivity of a material is the resistance of a cm long sample of the material of 1 cm2 cross-sectional area.