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A conducting sphere of radius 10 cm has an unknown charge. If the electric field 20 cm from the centre of the sphere is 1.5 × 103 N/C and points radially inward, what is the net charge on the sphere?
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What was the initial energy level of an electron if it was excited by a photon of wavelength 38.9µm and jumped to an energy level of 10?
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Determine the kinetic energy of a 75.0 kg mass moving at 61.3 m/s. Your answer should be in Joules.
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