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e'Y噑 \O:N鴙sQ耂蠎剉齉pe0 4Super Ball Throw a highly elastic ball into the space between two plates. The ball starts bouncing and under some circumstances can even be projected back to you. Investigate the motion of the ball and parameters influencing the motion, including the orientation of the plates. 4厤t T$N*Ns^g魰剉zz櫀TbN*N9_'`坃}Y剉t0t_薡9_ (W術汵臽礠 Nu髞颯錘9_轛0R`OKb N0xvzt剉h忶忓N蔛q_蚑袕≧S靊s^g筫T(W匭剉耂蠎0 5Ultrahydrophobic Water Set a dish filled with soapy water onto a loudspeaker or other vibrator. When it oscillates, it is possible to hold small droplets on its surface for a long time. Explain and investigate the phenomenon. 5 NfSbnN墑v4l 奲N*N艌醤倂4l剉豽P[>e(Wlb餢hVb棬R餝 N S_僛棬R剉鰁P 僛 g颯齹O奲N\鬾瞞鬾Yu(W Nb棃_曵e魰 銐蕬v^xvz購N皊a0 6Electric Honeycomb Set a vertically oriented steel needle over a horizontal metallic plate. Place some oil onto the plate. If you apply constant high voltage between the needle and the plate, a cell structure appears on the surface of the liquid. 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When varying the excitation frequency and/or amplitude, the water seems to drift away from or towards the cylinder. Investigate the phenomenon. 94l鈒 (uN*N謟魐/c≧剉4ls^W駁egu4l鈒 S_9e豐纎盧憳噑孴/cE^剉鰁P4l鈒O ww峞gAmTb虁粂W駁0鲖xvz購*N皊a0 10Light Rings Let a liquid jet fall onto a surface. If the contact point is illuminated by a laser beam, rings of light around the jet can be observed (see Figure). Investigate the light rings and determine how they depend on relevant parameters of the whole system. 10IQ痵 N*N瞞SO稶TN*Ns^b S_鎵筽珗纎IQgqf剉鰁P 颯聣Km0R痵諂4l駁剉IQ痵0xvz購*NIQ痵孴鴙sQ耂蠎鵞te*N鹼邁剉q_蚑0 11Rolling on a Disc If you put a light rolling object (e.g. a ring, a disc, or a sphere) on a horizontal rotating disc, it may start moving without being expelled from the disc. Explain how different types of motion depend on the relevant parameters. 11(WN*NIQ豽(Disc) N薳l GP俌`O奲N*N{弰v薳l廆w剉irSO>e(WN*N4ls^薳l弰v豽P[ N 僛颯錘 N粂_豽P[0W_薡袕≧0銐蕬鴙sQ耂蠎俌UOq_蚑T蛓 N Tb__剉袕≧0 12Van der Pauw Method It is known that conductivity of a material can be measured independently of the sample shape, as long as the sample has one border (no holes). To what extent can such a method be applied? Investigate and explain such measurements if the sample has holes. 12兎_!X筫誰 'Y禰龕鍂S怭g檈剉黐5u噑颯錘靣藌嶯7h罷b_秗0W珗Km蠎 闟亯7h罷 gT[0購蛓筫誰剉擽(uag鯪/f繬HN?xvzv^銐蕬購蛓筫誰擽(u嶯 gT[irSO剉L:N0 13Paper Vice Take two similar paperback books and interleave a few pages at a time. Push the books together. Hold the two books by their spines and try to pull them apart. 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