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

Physics & Space Science

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A. 1.5 N B. 1.3 N C. 1.1 N D. 1.7 N E. 3.1 N

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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?

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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

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