Which law is used to calculate the intensity of light at a given distance from a source?

A. square law
B. inverse square law
C. proportional law
D. spherical law


Answer: B

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This block specifies how to interpret a print according to the method of view projection.

a. angle of projection block b. dimensioning and tolerancing block c. revision history block d. title block

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PROBLEM 3.147 A cooling tube having the cross section shown is formed from a sheet of stainless steel of 3-mm thickness. The radii c1 ? 150 mm and c2 ? 100 mm are measured to the center line of the sheet metal. Knowing that a torque of magnitude T ? 3 kN ? m is applied to the tube, determine (a) the maximum shearing stress in the tube, (b) the magnitude of the torque carried by the outer circular shell. Neglect the dimension of the small opening where the outer and inner shells are connected.

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According to the text, 100 pieces of concrete tile are needed to cover one square (100 sq.ft) of roof area

Indicate whether the statement is true or false

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A wiring diagram depicts __________.

A. the common connection point in a piece of equipment that is not actually driven into the ground B. the number of active (on) positions on a switch C. the sequence of operations for a particular piece of equipment D. the switches that open and close their contacts during the normal operation of the equipment

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