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标题: GWD-2-math [打印本页]

作者: uniqueness 时间: 2005-5-18 07:01 标题: GWD-2-math

Q6:

20 ft

The figure above shows the dimensions of a semicircular cross section of a one-way tunnel. The single traffic lane is 12 feet wide and is equidistant from the sides of the tunnel. If vehicles must clear the top of the tunnel by at least ½ foot when they are inside the traffic lane, what should be the limit on the height of vehicles that are allowed to use the tunnel?

A. 5½ ft

B. 7½ ft

C. 8 ½ ft

D. 9½ ft

E. 10 ft

答案：B

上面那张图无法显示，就是一个半圆的样子，圆弧对应的直线为20feet，也不知道是直径还是什么意思

作者: himba 时间: 2005-5-18 07:03

因为是sigle traffic lane, 所以可以求出在lane 以内到tunnel 顶部的高度为: 根号下10^2-6^2=8(此处的6是1/2的sigle traffic lane的宽度, 即12/2)

又因为必须有1/2ft的clearence, 得到答案8-1/2=71/2ft

大家可以再画图看看.

作者: uniqueness 时间: 2005-5-19 06:52

thanks a lot !!!

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