# IYPT 2013

IYPT 2013&CUPT 以及翻译浅析--一乐一乐。。个人之观点

1. Invent yourself-力学

It is more difficult to bend a paper sheet, if it is folded “accordion style” or rolle

d i nto a tube. Using a single A4 sheet and a small amount of glue, if required, constr uct a bridge spanning a gap of 280 mm. Introduce parameters to describe the stre ngth of your bridge, and optimise some or all of them.

2. Elastic space-力学

The dynamics and apparent interactions of massive balls rolling on a stretched horiz ontal membrane are often used to illustrate gravitation. Investigate the system furth er. Is it possible to define and measure the apparent “gravitational constant” in suc h a “world”?

3. Bouncing ball-力学。。。

If you hold a Ping-Pong ball above the ground and release it, it bounces. The natur e of the collision changes if the ball contains liquid. Investigate how the nature of t he collision depends on the amount of liquid inside the ball and other relevant para meters.

A chain of similar pendula is mounted equidistantly along a horizontal axis, with adj acent pendula being connected with light strings. Each pendulum can rotate about t he axis but can not move sideways (see figure). Investigate the propagation of a d eflection along such a chain. What is the speed for a solitary wave, when each pen dulum undergoes an entire 360? revolution?

5. Levitation-流体力学！

A light ball (e.g. a Ping-Pong ball) can be supported on an upward airstream. The airstream can be tilted yet still support the ball. Investigate the effect and optimise the system to produce the maximum angle of tilt that results in a stable ball positio n.

In bright light, a transparent plastic object (e.g. a blank CD case) can sometimes s hine in various colours (see figure). Study and explain the phenomenon. Ascertain if one also sees the colours when various light sources are used.

Coat one half of the inside of a jar with a layer of soot and drill a hole in its cove r (see figure). When light from a light bulb connected to AC hits the jar’s black wal l, a distinct sound can be heard. Explain and investigate the phenomenon.

A thin liquid jet impacts on a soap film (see figure). Depending on relevant parame ters, the jet can either penetrate through the film or merge with it, producing inter esting shapes. Explain and investigate this interaction and the resulting shapes.

9. Carbon microphone-电学

For many years, a design of microphone has involved the use of carbon granules. V arying pressure on the granules produced by incident sound waves produces an ele ctrical output signal. Investigate the components of such a device and determine its characteristics.

10. Water rise-热学

Fill a saucer up with water and place a candle vertically in the middle of the sauce r. The candle is lit and then covered by a transparent beaker. Investigate and expla in the further phenomenon.

11. Ball bearing motor-电学

A device called a “Ball Bearing Motor” uses electrical energy to create rotational mo tion. On what parameters do the motor efficiency and the velocity of the rotation d epend? (Take care when working with high currents!)

12. Helmholtz carousel-力学

Attach Christmas tree balls on a low friction mounting (carousel) such that the hole in each ball points in a tangential direction. If you expose this arrangement to sou nd of a suitable frequency and intensity, the carousel starts to rotate. Explain this p henomenon and investigate the parameters that result in the maximum rotation spe ed of the carousel.

13. Honey coils-流体力学？？热血？？

A thin, downward flow of viscous liquid, such as honey, often turns itself into circul ar coils. Study and explain this phenomenon.

14. Flying chimney-热学，力学

Make a hollow cylindrical tube from light paper (e.g. from an empty tea bag). Whe n the top end of the cylinder is lit, it takes off. Explain the phenomenon and invest igate the parameters that influence the lift-off and dynamics of the cylinder.

15. Meniscus optics-光学

Cut a narrow slit in a thin sheet of opaque material. Immerse the sheet in a liquid such as water. After removing the sheet from the liquid, you will see a liquid film in the slit. Illuminate the slit and study the resulting pattern.

16. Hoops-力学

An elastic hoop is pressed against a hard surface and then suddenly released. The hoop can jump high in the air. Investigate how the height of the jump depends on the relevant parameters.

17. Fire hose-力学。。。流体力学

Consider a hose with a water jet coming from its nozzle. Release the hose and obs erve its subsequent motion. Determine the parameters that affect this motion.

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