In an experiment a student arranges for air to blow across top of an iron plate that has a large area and a thickness, d, of 2.0 mm. The air underneath the plate is at rest.
What is the speed of air flow above which the student would observe the plate to rise? (Ignore the small buoyancy force of the air acting on the heavy plate. i.e. ignore pairgd.)
Patmosphere = 101300 Pa
Density of air = 1.29 kg/m3
g = 9.81 m/s2
P + 1/2 pv2 + pgh = constant
The Attempt at a Solution
The answer is apparently v = 15.4 m/s.
But I do not know how to even start this question as only little data is given.
Your help will be very appreciated. Or any suggestions/ideas/hint would help a lot as well.