Three masses are located in the x-y plane as follows: a mass of 6 kg is at (0 m, 0 m), a mass of 4 kg is at (3 m, 0 m), and a mass of 2 kg is at (0 m, 3 m). Where is the center of mass (or center of gravity) of the system?
A) (1 m, 2 m)
B) (2 m, 1 m)
C) (1 m, 1 m)
D) (1 m, 0.5 m)
E) (0.5 m, 1 m)
D
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In a solar cell the light initially passes through the n-type silicon to reach the pn-junction where it is desired that the light absorption occur. If we want at least 90 percent of the light entering a silicon solar cell to reach the pn-junction region, what is the maximum thickness of the n-type material for 0.6 ?m light assuming pure silicon?
What will be an ideal response?
The room-temperature electrical conductivity of pure silver is 6.8×107 (?·m)-1 , and for pure copper the electrical conductivity is 6.0×107 (?·m)-1 . An alloy is made of 40 vol % copper and 60 vol % silver. Copper and silver form a eutectic phase diagram, with no solubility of copper in silver or of silver in copper at room temperature. Predict the room-temperature electrical resistivity of an alloy made from these materials.
What will be an ideal response?
What is the magnetic force on a 2.0-m length of (straight) wire carrying a current of 30 A in a region where a uniform magnetic field has a magnitude of 55 mT and is directed at an angle of 20° away from the wire?
A. 1.5 N B. 1.3 N C. 1.1 N D. 1.7 N E. 3.1 N
Compared with Newton's theory of gravity, Einstein's theory is
A) an exception to the correspondence principle. B) in accord with the correspondence principle. C) neither of these