An office building is constructed with a 6 inch space between the floor and the ceiling of the next lower floor, as shown. If air passes through the space at 65ºF determine the convective heat transfer per unit area when the floor and ceiling are 75ºF.
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The universe's density, compared to the critical density, determines the ________ of space
Fill in the blank(s) with correct word
A pinhole camera is used to photograph a 23-cm tall object at a distance of 3.0 m, the image being projected on film at a distance of 46 cm from the pinhole. What are the height and orientation of the image?
a. 3.5 cm, upright c. 12 cm, upright b. 3.5 cm, inverted d. 12 cm, inverted
By how much did the flux increase or decrease from point 1 to point 2 in the above figure if the distance to 1 is r and the distance to 2 is 2r?
a. increase by double
b. decrease by double
c. increase by quadruple
d. decrease by quadruple
The pressure relief valve is opened on a thin-walled cylindrical tank, with the radius-to-wall thickness ratio of 128, thereby decreasing the longitudinal strain by 150 3 1026. Assume E 5 73 GPa and ? 5 0.33. The original internal pressure in the tank was approximately:
(A) 370 kPa
(B) 450 kPa
(C) 500 kPa
(D) 590 kPa
