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1、Problems for the 28thIYPT 20151. PackingThe fraction of space occupied by granular particles depends on their shape. Pour non-spherical particles such as rice, matches, or M&Mscandies into a box. How do characteristics like coordination number, orientational order, or the random close packing fracti
2、on depend on the relevant parameters? 1.堆积(Packing)被颗粒状物体(particles)占据的小部分空间取决于它们的形状。将例如米、火柴或M&M糖果的非球状物体倾倒进一个盒子里，相关参量如何影响配位数(coordination number)、秩序性排列(orientational order)和随机紧密堆积分数(random close packing fraction)这样的特征？2. Plume of SmokeIf a burning candle is covered by a transparent glass, the flame
3、extinguishes and a steady upward stream of smoke is produced. Investigate the plume of smoke at various magnifications.2.羽状的烟/烟羽(Plume of smoke)如果一支燃烧着的蜡烛被一块透明玻璃板覆盖，火焰会熄灭，并且产生一缕稳定的向上流动的轻烟。研究在各种放大倍数下的羽状的烟。【此处plume有羽状之意，故不将题目翻译为轻烟一缕】3. Artificial MuscleAttach a polymer fishing line to an electric dril
4、l and apply tension to the line. As it twists, the fibre will form tight coils in a spring-like arrangement. Apply heat to the coils to permanently fix that spring-like shape. When you apply heat again, the coil will contract. Investigate this artificial muscle.3.人造肌肉/伪肌肉(Artificial muscle)将一个多聚物钓鱼线
5、固定(attach)在电钻上并使其绷紧。当它扭转时，钓鱼线纤维会形成像弹簧一样排列的牢固的线圈。对线圈加热使它定型，成为弹簧一样的形状。当你再次加热时，线圈会收缩。研究这个人造肌肉。4. Liquid Film MotorForm a soap film on a flat frame. Put the film in an electric field parallel to the film surface and pass an electric current through the film. The film rotates in its plane. Investigate an
6、d explain the phenomenon. 4.液体膜发动机(Liquid film motor)使一个肥皂膜在平整的边框上形成。将膜放在平行于膜面的电场中并(and)通上贯穿(through)膜的电流。膜会在所在平面中旋转。研究并解释这个现象。PS.此处的 and 可能不表示并列而表示因果。5. Two BalloonsTwo rubber balloons are partially inflated with air and connected together by a hose with a valve. It is found that depending on initi
7、al balloon volumes, the air can flow in different directions. Investigate this phenomenon. 5.双气球(Two balloons)两个橡胶气球被不完全充满气并被一个带阀的塑料管(hose)连接。会发现空气由于初始气球体积不同而流向不同方向这样的现象。研究这个现象。6. Magnus GliderGlue the bottoms of two light cups together to make a glider. Wind an elastic band around the centre and ho
8、ld the free end that remains. While holding the glider, stretch the free end of the elastic band and then release the glider. Investigate its motion.6.马格努斯滑翔机(Magnus glider)将两个轻质杯子的底部粘在一起来制作一个滑翔机。将一根弹性带子(band)缠绕在滑翔机的中心并抓住余下的自由端。当握着滑翔机时，拉伸带子的自由端然后释放滑翔机。研究它的运动。7. Shaded PolePlace a non-ferromagnetic m
9、etal disk over an electromagnet powered by an AC supply. The disk will be repelled, but not rotated. However, if a non-ferromagnetic metal sheet is partially inserted between the electromagnet and the disk, the disk will rotate. Investigate the phenomenon. 7.被覆盖的磁极(Shaded pole)将一个非铁磁性的金属碟放在通交流电的电磁铁上
10、，金属碟会排斥但不会旋转。但如果一块非铁磁性的金属薄片部分被部分插入两者之间，金属碟会旋转。研究这个现象。PS.鉴于此处为电磁铁故将 pole 译为磁极。8. Sugar and SaltWhen a container with a layer of sugar water placed above a layer of salt water is illuminated, a distinctive fingering pattern may be seen in the projected shadow. Investigate the phenomenon and its depend
11、ence on the relevant parameters. 8.糖和盐(Sugar and salt)当一个将一层糖铺在一层盐上的容器被照明，我们可能在投射的背光处看到一种独特的指纹形图案(fingering pattern)。研究这个现象和与相关参量的依赖性。9. HovercraftA simple model hovercraft can be built using a CD and a balloon filled with air attached via a tube. Exiting air can lift the device making it float over
12、 a surface with low friction. Investigate how the relevant parameters influence the time of the low-friction state.9.气垫船(Hovercraft)将一张CD光盘和一个充满气的气球通过一根管子连接。漏气可以升起装置使其以低摩擦漂浮在一个表面上。研究相关参量如何影响低摩擦状态持续的时间。10. Singing Blades of GrassIt is possible to produce a sound by blowing across a blade of grass, a
13、paper strip or similar. Investigate this effect.10.振鸣的草叶(Singing blades of grass)横过一片草叶或一张纸条或其他类似的东西吹气从而发声是可行的。研究这个现象。PS.题目中的singing解释为唱歌略不妥，鉴于实际故译为振鸣。11. Cats WhiskerThe first semiconductor diodes, widely used in crystal radios, consisted of a thin wire that lightly touched a crystal of a semicondu
14、cting material(e.g. galena). Build your own cats-whisker diode and investigate its electrical properties. 11.猫须接收器(Cats whisker)广泛运用于矿石收音机的第一(first)半导体二极管包含一个轻触在半导体材料(例如方铅矿/加利纳 galena )的晶体上的细导线。自制猫须接收器半导体元件并研究它的电学特性。12. Thick LensA bottle filled with a liquid can work as a lens. Arguably, such a bot
15、tle is dangerous if left on a table on a sunny day. Can one use such a lens to scorch a surface? 12.厚透镜(Thick lens)一个装满液体的瓶子可以用作透镜。有人认为(arguably)如果将这样的瓶子在晴天放在桌子上会造成危险。可以用这样的透镜来烤焦一个表面吗？13. Magnetic PendulumMake a light pendulum with a small magnet at the free end. An adjacent electromagnet connected
16、to an AC power source of a much higher frequency than the natural frequency of the pendulum can lead to undamped oscillations with various amplitudes. Study and explain the phenomenon. 13.磁力摆(Magnetic pendulum)制作一个自由端有一个小磁体的轻摆。一个临近的通有频率远高于摆的固有频率交流电的电磁铁可以导致不同振幅的无阻尼振动。研究并解释这个现象。14. Circle of LightWhen a laser beam is aimed at a wire, a ci
