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注意：题目不能只看翻译，必须充分参考原题。
Problem No. 1 “Invent
yourself”
It is known that
some electrical circuits exhibit chaotic
behaviour. Build a simple
circuit with
such a property, and investigate its behaviour.
1.
自己创造
据了解，一些电路表现出混沌行为。构建一个具有这种属性的简单电路，并研究其行为。
Problem
No. 2
“Hologram”
It is argued that
a hologram can be hand made by scratching a piece
of plastic.
Produce such a ‘hologram’
with the letters ‘IYPT’ and investigate how it
works.
2.
全息照片
有人认为，在一块透明塑料上划出图案可以手工制作出一张全息照片。制作一张字母
“
IYPT
”的全息图并研究它是如何工作的。
Problem No
. 3 “Twisted
rope”
Hold a rope and twist
one end of it. At some point the rope will form a
helix or a
loop. Investigate and
explain the phenomenon.
3.
扭曲的绳
握住绳子扭它的一端。在绳索上的某一点将形成螺旋线或圆环。调查解释这样的现象。
Problem No. 4 “Ball
sound”
When two hard steel
balls, or similar, are brought gently into contact
with each
other,an unusual ‘chirping’
sound may be produced. Investigate and explain the
nature of the sound.
4.
球的声音
当两个硬钢球或类似的东西被轻轻带到接触到对方，一个不寻常的“鸣叫声”
。调查解
释
的声音的性质。
Problem No. 5 “Loaded hoop”
Fasten a small weight to the inside of
a hoop and set the hoop in motion by giving it
an
initial push. Investigate
the hoop’s motion.
5.
载物的环
在一个环的里面固定一个小重物，给环一个初始推力使其运动。研究环的运动。
Problem No. 6 “Bubble
crystal”
A large number of
very small, similar air bubbles float on the
surface of a soapy
bubbles will
arrange themselves into a regular pattern similar
to a
crystalline lattice. Propose a
method to obtain bubbles of a consistent size, and
investigate the formation of such a
bubble crystal.
6.
泡泡晶体
大量非常小的相似的气泡浮在肥皂水的表面上。气泡会自动按照一个规律的类似晶格的
模式排列。提出一种获得大小一致的的气泡的方法，并探究这种泡泡晶体的形成。
Problem No. 7
“Pot
-in-
pot
refrigerator”
The
‘pot
-in-
pot refrigerator’ is
a device that keeps food cool using the principle
of
evaporative cooling. It
consists of a pot placed inside a bigger pot with
the space
between them filled with a
wet porous material, e.g. sand. How might one
achieve
the best cooling effect?
7.
“罐中罐”冰箱
这一个依据蒸发冷却的原理让食物保鲜的装置。它包括一个大容器、里面的小容器。它
< br>们之间的空间内用湿的多孔材料填充，例如沙子。问怎么能达到最佳的散热效果？
Problem No. 8 “Freezing
droplets”
Place a water
droplet on a plate cooled down to around -20
°
C. As it freezes, the
shape
of the droplet may become cone-like with a sharp
top. Investigate this effect.
8.
冻结水滴
将水滴放置在冷却到
-20
°
C
左右的板上。
结冰后液滴可能会成为有锋利的顶部的圆锥状。
调查这种现象。
Problem No. 9 “Water bombs”
Some students are ineffective in water
balloon fights as the balloons they throw
rebound without bursting. Investigate
the motion, deformation, and rebound of a
balloon filled with fluid. Under what
circumstances does the balloon burst?
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