81. Gauge pressure of air to which the ball must have been originally inflated so that
it would equal 1 bar gauge at the stadium is:
(A) 2.23 bar
(B) 1.94 bar
(C) 1.07 bar
(D) 1.00 bar
Statement for Linked Answer Questions 82 & 83:
A smooth flat plate with a sharp leading edge is placed along a gas stream flowing at U
= 10 m/s. The thickness of the boundary layer at section r − s is 10 mm, the breadth of
the plate is 1 m (into the paper) and the density of the gas ρ = 1.0 kg/m .
3 Assume that
the boundary layer is thin, two-dimensional, and follows a linear velocity distribution,
( ) ,
u = U y δ at the section r − s , where y is the height from plate.
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