435) Two shafts A and B are made of the same material. The diameter of shaft A is twice as that of shaft B. The power transmitted by the shaft A will be __________ of shaft B.

436) A parallel sunk key, made of steel, is equally strong in shearing and crushing.

437) In designing a key, it is assumed that the distribution of forces along the length of key

438) In a belt drive, the velocity ratio is the inverse ratio of the diameters of driving and driven pulleys.

439) In order to have a connecting rod equally strong in buckling about X-axis and Y-axis, the moment of inertia about X-axis should be __________ the moment of inertia about Y-axis.