The drag force FD on an airplane is a function of its velocity V , its length L, and the air density rho. The drag force is 0.3 N, when tested with a model plane at sea level, with a wind velocity of 10 m/s. What will be the drag force on a prototype that is 15 times larger and is traveling at 200 m/s at an altitude of 3 km?

Steel is coated with a thin layer of ceramic to protect against corrosion. what do you expect to happen to the coating when the temperature of the steel is increased significantly? explain.

During a steady flow process, the change of energy with respect to time is zero. a)- true b)- false

Adouble-strand no. 60 roller chain is used to transmit power between a 13-tooth driving sprocket rotating at 300 rev/min and a 52-tooth driven sprocket. a) what is the allowable horsepower of this drive? b) estimate the center-to-center distance if the chain length is 82 pitches. c) estimate the torque and bending force on the driving shaft by the chain if the actual horsepower transmitted is 30 percent less than the corrected (allowable) power.