A block with mass of 500kg is being pulled by a cable that is set an angle of 12 degrees above the h

题目

A block with mass of 500kg is being pulled by a cable that is set an angle of 12 degrees above the horizontal.If the coefficient of static friction is 1.42 and the coefficient of kinetic friction is 0.76,what is the tension in the cable just before the block starts moving and what is the tension in the cable if after the block begins to move it is kept mocing at a constant velocity?
鄙人的模糊翻译(英文为标准):
在一个区段,500 公斤的块被被设定在水平线上面的一个 12 度的角度的电缆拉着.如果静态摩擦的系数是 1.42 ,而且运动摩擦的系数是 0.76,在在区段移动之前,电缆的拉力是多少?在持续的速度移动的时候,电缆的又是多少?

答案