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1. Three people pull simultaneously on a stubborn donkey. Jack pulls directly ahead of the donkey with a force of 93.9 N, Jill pulls with 78.3 N in a direction 45° to the left, and Jane pulls in a direction 45° to the right with 185 N. (Since the donkey is involved with such uncoordinated people, who can blame it for being stubborn?) Find the magnitude of the net force the people exert on the donkey.
___N
What is the direction of the net force? Express this as the angle from straight ahead between 0° and 90°, with a positive sign for angles to the left and a negative sign for angles to the right.
Calculate the change in copper entropy associated with cooling one mole of copper over the following two ranges. Use the full form of Cp (if Cp is needed).
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The changes in the chromatograph resulting from changes in mobile phase composition (not all observed change are easily explainable-just explain what u can, in particular the general change to longer or shorter elusion times for all analyses
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An important industrial process for synthesizing the ammonia used in agricultural fertilizers involves the combination of N2 and H2:
The volume of a sample of nitrogen is 6.00 liters at 35oC and 740 torr. What volume will it occupy at STP?
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