To determine boundary-layer characteristics on a body, we must first know the potential-flow solution. The information used from the potential-flow solution is:
(A) The lift and drag acting on the body
(B) The pressure and velocity at the boundary of the body
(C) The shearing stress acting on the boundary of the body
(D) The normal and shearing stress acting on the boundary of the body
(B) The pressure and velocity at the boundary of the body
The velocity at the outer edge of the boundary layer is assumed to be the velocity at the wall obtained from the potential flow solution. The pressure is needed since the Navier-Stokes equation, which must be solved to obtain the solution to the boundary-layer problem, includes the pressure gradient.
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Fill in the blank(s) with the appropriate word(s).
A string with a mass per length of 2.00 g/m is stretched between two points that are 0.400 m apart. The second mode frequency of the stretched string is 50.0 Hz lower than the third mode frequency. What is the tension in the string?
A. 400 N B. 375 N C. 321 N D. 281 N E. 250 N
Modern scientific theories are NOT:
A) testable. B) continuously tested. C) simple. D) perfect. E) elegant.
The observed slowing of a clock in the vicinity of a black hole is a prediction of
A) the Roche Limit. B) Special relativity. C) General relativity. D) Stellar nucleosynthesis. E) the Cosmological Principle.