To be more effective, how should one shape the tip of a lightning rod?
A) sharpened to a point
B) with a rounded tip (hemispherical)
C) flat (cut off perpendicular to the rod axis)
A
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A circumferential cast iron fin attached to a compressor housing is 1 inch thick, 3 in long, 3 in diameter, and the convective heat transfer coefficient is 16 Btu/hr?ft^2? ºF. If the base temperature is 160ºF and the surrounding air is 80ºF, determine the fin efficiency and the heat transfer through the fin.
What will be an ideal response?
Matter swirling into a compact object forms a(n) _______________ disk
Fill in the blank(s) with correct word
Some giants and/or supergiants are less dense than air
a. True b. False Indicate whether the statement is true or false
A girl whirls a ball on the end of a string above her head. Assume the motion of her hand to keep the ball in motion is negligible. For the ball to remain in a circular path while it rotates with a constant speed:
a. only the centripetal force shown in the figure is required. b. in addition to the centripetal force shown in the figure, there must also be a force tangent to the motion of the ball. c. in addition to the centripetal force shown in the figure, there must also be a centrifugal force that pulls the ball outward. d. in addition to the centripetal force shown in the figure, there must also be a force radially inward from the string to cause circular motion. e. the centripetal force inward and the centrifugal force outward must balance each other.