When we drive our car at 100 feet per second [ft/s], we measure an aerodynamic force (called drag) of 65 pounds-force [lb Subscript f ] that opposes the motion of the car. How much horsepower [hp] is required to overcome this drag?

At 20∘c, the hole in an aluminum ring is 2.800 cm in diameter. you need to slip this ring over a steel shaft that has a room-temperature diameter of 2.804 cm . 1. to what common temperature should the ring and the shaft be heated so that the ring will just fit onto the shaft? coefficients of linear thermal expansion of steel and aluminum are 12×10−6 k−1 and23×10−6 k−1 respectively.