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Why is aldehydes give positive result in tollens test while ketones don t? 80-kg man standing on a scale in an elvator notes that as the elevator rises the scale reads 840 N. What the acceleration of the elevator? A radio wave has a frequency of 5.40 × 108 Hz. What is the energy (in J) of one photon of this radiation? Bag w/ 2 red, 5 orange, 3 purple, 2 green, & 3 yellow. 2 selected w/out replacement. What prob. of selecting exactly 1 red and 1 purple? A lamina of constant density 6kg/m^2 is defined by the region x+y =<2, x>0, y>=0. Find My and Mx?