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Grade: 10

                        

Two long barges are floating in the same direction in still water, one with a speed of 9.65 km/h and the other with a speed of 21.2 km/h. While they are passing each other, coal is shoveled from the slower to the faster one at a rate of 925 kg/min; see Fig. How much additional force must be provided by the driving engines of each barge if neither is to change speed? Assume that the shoveling is always perfectly side- ways and that the frictional forces between the barges and the water do not depend on the weight of the barges.

Two long barges are floating in the same direction in still water, one with a speed of 9.65 km/h and the other with a speed of 21.2 km/h. While they are passing each other, coal is shoveled from the slower to the faster one at a rate of 925 kg/min; see Fig. How much additional force must be provided by the driving engines of each barge if neither is to change speed? Assume that the shoveling is always perfectly side- ways and that the frictional forces between the barges and the water do not depend on the weight of the barges.

5 years ago

Answers : (1)

Jitender Pal
askIITians Faculty
365 Points
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Therefore, the external force that must be applied by the barge moving at higher speed is 49.3 N whereas the barge moving at lower speed need not apply any force to account for the fact the barge moves with constant speed.
5 years ago
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