Chloe is a champion softball batter. In a recent game, the pitcher threw the 181-g softball at Chloe and when it was 1.5 m above the ground it had a speed of 15.0 m s-1. Chloe hit the ball so hard that it cleared the outfield fence. At one point in its trajectory, the ball was 28.8 m above the ground and moving with a speed of 19.7 m/s. Calculate the work that Chloe did on the softball.

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.