Oil is flowing through a 4-inch diameter pipe having a velocity of 6 ft/sec. The flow rate gallon per minute and kinetic energy of water in (ft)(lbf)/(lbm) are respectively?

If a car is traveling on the highway at a constant velocity, the force that pushes the car forward must be a. equal to the weight of the car. b. less than the force of friction exerted upon the car. c. equal to the force of friction exerted upon the car. d. greater than the weight of the car.