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108年 - 108 全國高級中等學校學生技藝競賽考試_工業類:電腦輔助機械製圖#139135
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一、1 至5 題請依左邊之正投影視圖徒手畫等角立體圖(隱藏線需繪出),並請依右上角圖示方向繪製。(每題4分,共20分)
(請用鉛筆、尺、橡皮擦作答,否則不記分)
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(a).Suppose that the cylinder is sliding without rolling down the smooth inclined face of the wedge, and the wedge is free to move on a horizontal plane with friction. How far has the wedge moved by the time the cylinder has descended from a rest a vertical distance h?Ans:___(1)____
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(b). Now suppose that the cylinder is free to roll down the wedge without slipping. The horizontal plane is still without friction. How far does the wedge move in this case?Ans:___(2)____
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2. A particle of mass m with a velocity of v collides elastically with the end of a uniform thin rod of mass M. (The other end of the rod is fixed.) The length of M is L. After the collision, m is stationary. In the case, determine the mass of M.Ans:___(3)____
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3. A girl holds a tuning fork vibrating at 400 Hz and walks at 10 m/s away from a wall. What beat frequency does he hear between the fork and the echo? The speed of sound is 330 m/s.Ans:___(4)____
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4. Calculate the minimum coefficient of friction necessary to keep a thin circular ring from sliding as it rolls down a plane inclined at an angle θ with respect to the horizontal plane.Ans:___(5)____
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