- Bond angle of HNC?

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I have a new number cant log in? If the angle of refraction is 45 and the refractive index is 1.33, find the angle of incidence? Uncharged electroscope and charged body? Prove that the work done in raissing a mass m from earth s surface to a height h is (mg) / (1+(h/R)) R is raidus of earth? Integrate cos^5x?