Star A and star B have the same apparent magnitude. Star A is twice as distant as star B. Therefore, star A has twice the luminosity as star B
Indicate whether the statement is true or false
FALSE
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An aluminum light pole weighs 4300 N and supports an arm of weight 700 N, with the arm center of gravity at 1.2 m left of the centroidal axis of the pole. A wind force of 1500 N acts to the right at 7.5 m above the base. The pole cross section at the base has an outside diameter of 235 mm and thickness of 20 mm. The maximum compressive stress at the base is approximately:
(A) 16 MPa
(B) 18 MPa
(C) 21 MPa
(D) 24 MPa
_________is the increase in conductivity that results when photons excite electrons in a semiconductor or insulator into the conduction band.
Fill in the blank(s) with the appropriate word(s).
The second is a metric unit of measure
Indicate whether the statement is true or false
Resistance and Resistivity: When a thin copper wire that is 178 m long is connected between a 1.2-V potential difference, a current of 2.0 amps flows through the wire. What is the diameter of this wire? The resistivity of copper is 1.72 × 10-8 ? ? m.
Fill in the blank(s) with the appropriate word(s).