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

Physics & Space Science

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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.

Physics & Space Science

Matter swirling into a compact object forms a(n) _______________ disk

Fill in the blank(s) with correct word

Physics & Space Science

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?

Physics & Space Science

Some giants and/or supergiants are less dense than air

a. True b. False Indicate whether the statement is true or false

Physics & Space Science