Question: A propeller shaft of solid circular cross section and diameter d is spliced by a collar of the same material ( see figure ) .

A propeller shaft of solid circular cross section and diameter d is spliced by a collar of the same material (see figure). The collar is securely bonded to both parts of the shaft. What should be the minimum outer diameter d1 of the collar in order that the splice can transmit the same power as the solid shaft? (10 pts)
A propeller shaft of solid circular cross section

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