Air at 80of is to flow through a 2-ft pipe at an average velocity of 6 ft/s. what size pipe should be used to move water at 60of and average velocity of 2.9 ft/s if reynolds number similarity is enforced?

Given the position vector of the particle r(t)=(t+1)i+(t^2−1)j+2t k, find the particle's velocity and acceleration vectors at t=1

Why don't you see your reflection in water with waves or repples

What is the stall speed at sea level of an airplane that weights 10000 lbs., has a wing area of 300ft^2, and a maximum lift coefficient of 1.4? what is the stall speed if flaps that double cl,max are applied?