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1. If the density of kerosene is 808 kg/m3,how much is the mass and weight of thekerosene with the volume of 2×10-3m3?2.If pistol was pressurized,the volume of the liquid in the cylinder block is 10-3m3when the pressur... [详细]

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Exercises     

1. On a square with side length of 0.02 m in a horizontal plane xOy,uniform forceacting on the square is F=4i+3j+9k and the unit is N. Calculate: (1) the verticalcomponent and tangential component; (2) pressure and shea... [详细]

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