If the AA designation of an alloy begins with a “7”, the major alloy element is _________.
Fill in the blank(s) with the appropriate word(s).
zinc
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Resistance and Resistivity: The figure shows a graph of the resistance of a wire as a function of its length. What physical quantities does the slope of this graph represent?
A. the cross-sectional area of the wire B. the resistivity of the material of which the wire is made C. the product of the resistivity and the cross-sectional area of the wire D. the resistivity of the material divided by the cross-sectional area of the wire E. the reciprocal of the resistivity of the material
Diving in your swimming pool, you let out a stream of bubbles. As they rise towards the top do they increase in diameter, decrease in diameter, or stay the same size?
A. increase B. decrease C. stay the same
A proton moves across the Earth's equator in a northeasterly direction. At this point the Earth's magnetic field has a direction due north and is parallel to the surface. What is the direction of the force acting on the proton at this instant?
a. toward the northwest b. out of the Earth's surface c. into the Earth's surface d. toward the northeast
Where must an object be placed to form an erect image with a concave mirror?