46. 下列何者並非粉末冶金之優點：
(A)節省加工時間及材料
(B)適合任何金屬材質
(C)適合大量生產
(D)可使用複合材料

47. 日常生活所使用的普通玻璃乃屬於： (A)硼玻璃 (B)鉀玻璃 (C)鉛玻璃 (D)鈉玻璃

48. 玻璃之主要成份為： (A)二氧化碳 (B)二氧化錳 (C)二氧化矽 (D)二氧化磷

49. 一般所謂的「琉璃」乃屬於： (A)鈉玻璃 (B)鉛玻璃 (C)鉀玻璃 (D)硼玻璃

50. 下列何者由於熱膨脹係數較低，較適合餐具的使用？ (A)鈉玻璃 (B)鉛玻璃 (C)鉀玻璃 (D)硼玻璃

1. A particle moves along the y axis. Its position is given by the equation \( y(t) = 2 + 3t - 4t^2 \), with y in meters and t in seconds. What's its position when it changes direction?(A)2.56 m(B)1.28 m(C)4.23 m(D)2.12 m(E)3.84 m

2. A particle moves along a straight line starting at t = 0. Its position is given by the equation \( x(t) = 75t - 1.0t^3 \), where t is in seconds. When it stops (v=0), its acceleration is:(A)0(B)-73 m/s²(C)-30 m/s²(D)-9.8 m/s²(E)49 m/s²

3. A single closed loop of chain of mass m and length l rests on the surface of a smooth, frictionless cone. The chain lies in a horizontal plane. The half-angle of the cone is α. What's the tension in the chain?(A)\( T = \frac{mg}{\tan\alpha} \)(B)\( T = \frac{mg}{2\pi} \)(C)\( T = mg \)(D)\( T = \frac{mg}{2\pi\cot\alpha} \)(E)\( T = \frac{mg}{2\pi\tan\alpha} \)

4. If the net work done by external forces on a particle is zero, which of the following statements about the particle must be true?(A)Its velocity is zero.(B)Its velocity is decreased.(C)Its velocity is unchanged.(D)Its speed is unchanged.(E)More information is needed.

5. A car of mass m moving at a speed \( v_1 \) collides and couples with the back of a truck of mass 2m moving initially in the same direction as the car at a lower speed \( v_2 \). What is the speed \( v_f \) of the two vehicles immediately after the collision?(A)\( v_f = \frac{2}{3}(v_1 - 2v_2) \)(B)\( v_f = \frac{2}{3}(v_1 + v_2) \)(C)\( v_f = \frac{1}{3}(v_1 - 2v_2) \)(D)\( v_f = \frac{1}{3}(v_1 + 2v_2) \)(E)\( v_f = \frac{1}{2}(v_1 + v_2) \)

6. Objects A and B interact with each other via both conservative and nonconservative forces. Let \( K_A \) and \( K_B \) be the kinetic energies, U be the potential energy, and \( E_{int} \) be the internal energy. If no external agent does work on the objects then:(A)\( K_A + U \) is conserved(B)\( K_A + U + E_{int} \) is conserved(C)\( K_A + K_B + E_{int} \) is conserved(D)\( K_A + K_B + U \) is conserved(E)\( K_A + K_B + U + E_{int} \) is conserved

114年 - 114 全國高級中等學校學生技藝競賽考試_工業類：鑄造工#137949

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