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The separation distance between two 1.0 kg masses is
(a) Decreased by two-thirds and
(b) Increased by a factor of 3. How is the mutual gravitational force affected in each case?
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An electron is ejected from a metal with a velocity 7.78 x10^5 m/s. If the metal has a threshold frequency of 9.90 x1014 Hz, what was the wavelength of the incident photon?
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