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Why is the following situation impossible? A worker in a factory pulls a cabinet across the floor using a rope. The rope make an angle with the floor and is tied from the bottom of the cabinet. The uniform rectangular cabinet has height and width and it weighs 400 N. The cabinet slides with constant speed when a force F = 300 N is applied through the rope. The worker tires of walking backward. He fastens the rope to a point on the cabinet off the floor and lays the rope over his shoulder so that he can walk forward and pull. In this way, the rope again makes an angle of with the horizontal and again has a tension of 300 N. Using this technique, the worker is able to slide the cabinet over a long distance on the floor without tiring.
a. What is salinity? What is the average salinity of ocean water? b. Describe one factor that increases the salinity of seawater and one factor that decreases its salinity. c. Would you expect the seawater just below the floating ice in the Arctic Ocean to be higher or lower in salinity than the water in the deepest part of the ocean? Explain.