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2015年辽宁省大学生物理学术竞赛题目
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| 发布时间：
2015-04-04
浏览次数：
368
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2015年第二届辽宁省大学生物理学术竞赛题目 3. Artificial Muscle （人造肌肉）
Attach a polymer fishing line to an electric drill 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’.
（将一个多聚物钓鱼线固定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。当你再次加热时，线圈会收缩。研究这个"人造肌肉"。） 4. Liquid Film Motor （液体膜发动机）
Form 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 and explain the phenomenon.
（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通上贯穿膜的电流。膜会在所在平面中旋转。研究并解释这个现象。）  6. Magnus Glider （马格努斯滑翔机）
Glue the bottoms of two light cups together to make a glider. Wind an elastic band around the centre and hold 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.
（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。）
8. Sugar and Salt （糖和盐）
When 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 dependence on the relevant parameters.
（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。研究这个现象和与相关参量的依赖性。）
12. Thick Lens （厚透镜）
A bottle filled with a liquid can work as a lens. Arguably, such a bottle is dangerous if left on a table on a sunny day. Can one use such a ‘lens’ to scorch a surface?
（一个装满液体的瓶子可以用作透镜。可以认为如果将这样的瓶子在晴天落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？）
14. Circle of Light （环形光）
When a laser beam is aimed at a wire, a circle of light can be observed on a screen perpendicular to the wire. Explain this phenomenon and investigate how it depends on the relevant parameters.
（当一个激光束瞄准一根金属丝，在垂直于金属丝的屏幕上可以观察到一个环形光线。解释这个现象并研究其与相关参量的依赖性。）
16. Wet and Dark （潮湿且黑暗）
Clothes can look darker or change color when they get wet. Investigate the phenomenon.
（当衣服受潮时会看起来更暗或者改变颜色。研究这一现象。）
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