9. Magnetic Levitation

Under certain circumstances, the “flea” of a magnetic stirrer can rise up and levitate stably in a viscous fluid during stirring. Investigate the origins of the dynamic stabilization of the “flea” and how it depends on the relevant parameters.

8. Soap Membrane Filter

A heavy particle may fall through a horizontal soap film without rupturing it. However, a light particle may not penetrate the film and may remain on its surface. Investigate the properties of such a membrane filter.

8. صافی غشای صابونی

یک ذره ی سنگین ممکن است بدون ترکاندن یک لایه ی نازک صابونی افقی، از آن بگذرد. با این حال، یک ذره ی سبک ممکن است در لایه نفوذ نکند و ممکن است روی سطح آن بماند. ویژگی های این گونه صافی غشایی را بررسی کنید.

6. Saxon Bowl

A bowl with a hole in its base will sink when placed in water. The Saxons used this device for timing purposes. Investigate the parameters that determine the time of sinking.

6. کاسه ی ساکسون

یک کاسه با سوراخی در کف هنگامی که در آب قرار داده شود، غرق می شود. ساکسون ها برای مقاصد زمانی از این وسیله استفاده می کردند. متغیرهایی را بررسی کنید که زمان غرق شدن را تعیین می کنند.

5. Sweet Mirage

Fata Morgana is the name given to a particular form of mirage. A similar effect can be produced by shining a laser through a fluid with a refractive index gradient. Investigate the phenomenon.

4. Singing Ferrite

Insert a ferrite rod into a coil fed from a signal generator. At some frequencies the rod begins to produce a sound. Investigate the phenomenon.

3. Swinging Sound Tube

A Sound Tube is a toy, consisting of a corrugated plastic tube, that you can spin around to produce sounds. Study the characteristics of the sounds produced by such toys, and how they are affected by the relevant parameters.

2. Inconspicuous Bottle

Put a lit candle behind a bottle. If you blow on the bottle from the opposite side, the candle may go out, as if the bottle was not there at all. Explain the phenomenon.