请教一道数学题1.In Figure 7,a circle of radius 1 is placed on an in
请教一道数学题
1.In Figure 7,a circle of radius 1 is placed on an incline where point P,a point on the circle , has the corrdinates (-5,-5).The circle is rolled up the incline,and once the circle hits the origin,the circle is then rolled horizontally along the x-axis to the right.What is the x-coordinate of the point where P touches the incline or the x-axis for the fifth time (not including the starting point)?
(A) 8.64 (B) 17.27 (C) 24.34 (D)27.49 (E) 30.63
用OP长度除以圆的周长算出来超过11次了,而题目求的是第五次······
1.In Figure 7,a circle of radius 1 is placed on an incline where point P,a point on the circle , has the corrdinates (-5,-5).The circle is rolled up the incline,and once the circle hits the origin,the circle is then rolled horizontally along the x-axis to the right.What is the x-coordinate of the point where P touches the incline or the x-axis for the fifth time (not including the starting point)?
(A) 8.64 (B) 17.27 (C) 24.34 (D)27.49 (E) 30.63
用OP长度除以圆的周长算出来超过11次了,而题目求的是第五次······
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OP长：L=√50≈7.07,圆周长：C=2π≈6.28,第五圈时P点一定在X轴上,P点的x坐标为：
x=5C-L=10π-√50≈24.34.
所以,选项C是对的.
x=5C-L=10π-√50≈24.34.
所以,选项C是对的.
1年前
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