Measurements on a smooth sphere 150 mm in diameter in an air stream 20°C gave a force for equilibrium equal to 1.1 N. At what velocity was the air moving? What is the formula for the celerity of the...

Measurements on a smooth sphere 150 mm in diameter in an air stream 20°C gave a force for equilibrium equal to 1.1 N. At what velocity was the air moving? What is the formula for the celerity of the pressure wave due to rapid closing of a valve in a pipeline, considering the pipe to be rigid?