Estimate the convective heat transfer coefficient for air at 101 kPa, 30ºC passing around the square fin shown.
The convective heat transfer coefficient is predicted through the Nusselt number and the Nusselt number may be predicted from Equation 4-128 with the use of Table 4-5 for the parameters in this equation
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In weight-critical designs, the stiffness requirement for the relative merit uses the relative ___________elastic modulus.
Fill in the blank(s) with the appropriate word(s).
A porch roof sloping at 45° accumulated snow to a depth of 30. cm. The roof measured 3.0 m × 5.0 m. If the density of snow was 15. kg/ m2, what was the weight of the snow, in pounds, on the roof?
A) 210 lb B) 74 lb C) 56 lb D) 148 lb E) 105 lb
The wavelength of a certain portion of microwaves is 40 mm. What is its frequency?
A) 40 GHz B) 4.0 GHz C) 0.75 GHz D) 75 GHz E) 7.5 GHz
A bow wave is produced in water when the speed of an object
A) matches the speed of waves in water. B) exceeds the speed of waves in water. C) is less than the speed of waves in water. D) none of the above