A light truck weighs 3100 lb and is rated at 30 miles per gallon for 60-mph highway driving on level ground. Under those conditions, the engine must overcome air resistance, rolling resistance, and other sources of friction. Give your answers in the units shown.
(a) The coefficient of drag is 0.6 at 60 mph, and the truck’s frontal area is 32 ft2. What is the drag force on the truck?
(b) How much power must the engine produce at 60 mph just to overcome air resistance?
(c) In part (b) how much gasoline would be consumed each hour (neglecting other frictional effects)?
