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IYPT 2015
El. ntt75aw.'Lu (Two Balloons)
Two rubber balloons are partially inflated with air and connected together
by a hose with a valve. It is found that depending on initial balloon vol-
umes, the air can flow in different directions. Investigate this phenomenon.
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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.
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Place a non-ferromagnetic metal 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 ciisk
will rotate. Investigate the phenomenon
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A 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 a surface with
Low friction. Investigate how the relevant parameters influence the time of the "lowfriction' state.
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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.
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