如图所示，小物体A与水平圆盘保持相对静止，跟着圆盘一起做匀速圆周运动，则A的受力情况是（   ）

如图，P₁是反比例函数y=$\frac{k}{x}$（k＞0）在第一象限图象上一点，点A₁的坐标为（1，0）．

（1）当点P₁的横坐标逐渐增大时，△P₁OA₁的面积将如何变化？

（2）若△P₁OA₁与△P₂A₁A₂均为直角三角形，其中∠P₁OA₁=P₂A₁A₂=60°，求此反比例函数的解析式及点A₂的坐标．

根据短文选择正确答案。

    Li Ming is a middle school student. He is a good boy. Uncle Wu lives next to him. Uncle Wu has no child and can't see anything. He works in the factory near Li Ming's school. He goes to work at 7:30 in the morning and comes home at 4:30 in the afternoon. Li Ming walks to school at 8:00 in the morning and comes home at the same time as Uncle Wu in the afternoon. On weekdays, Li Ming gets up early to take Uncle Wu to the factory. After school he takes him home. On Sundays Li Ming helps Uncle Wu clean the house and do some cooking. Uncle Wu thanks Li Ming very much. He says, “Li Ming is a good boy. He is like my son. ”