1) consider a car of mass m=1215 kg that is moving up a=θ =12 hill All constant speed V =36 km/h as shown on the figure below. * The total resistive force (road friction and air resistance ) acting on the car for the speed is given by FR=1500 N and the height of the hill is h =12 m.

a) what power must be delivered by the car engine to travel the car of the constant speed ?

b) How much work is done by the force obtained from the car engine until the car reaches the top of the hill?

c) How much work is done by the resistive force until the car reaches

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.