Air flows over a sphere at 77 C. The diameter of the sphere is 10 cm. Find the air velocity that results in the Reynolds number to reach the transition from the laminar to turbulent flow if such...

Air flows over a sphere at 77 C. The diameter of the sphere is 10 cm. Find the air velocity that results in the Reynolds number to reach the transition from the laminar to turbulent flow if such transition takes place at a Reynolds number of about 250,000.

Water flows steadily in a horizontal and well-insulated pipe. Consider locations
a
and
b
along the length of the pipe and chose the correct answers for velocity (V), pressure (P), and temperature (T):