Midpoint of the bottom side of the square
Four 1.8 kg masses are located at the corners of a square 0.20 m on each side. Find the magnitude and direction of the gravitational force on a fifth 1.8 kg mass placed at the midpoint of the bottom side of the square.
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Draw the structure of histidine in each ionization state. What is the net charge of the histidine molecule in each ionization state?
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