Two identical small insulating balls are suspended by separate 0.26-m threads that are attached to a common point on the ceiling. each ball has a mass of 7.75 10^-4 kg. initially the balls are uncharged and hang straight down. they are then given identical positive charges and, as a result, spread apart with an angle of 35° between the threads. (a) determine the charge on each ball. (answer in c)

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.