\n\u00a0\u00a0\u00a0\u201cBefore me are the waves of the sea.
\nThere are so many. They are countless.\u201d<\/i>
\nB. Pasternak
\nDoes the \u201cNinth wave\u201d phenomenon exist? Clarify this question. As a starting point, you can use the ideas from the article \u201cTroika, semyorka, tuz…\u201d (Znanie \u2014 sila, 1987, No. 1, pp. 97\u2014104<\/a>.)<\/p>\n
10. Self-ignition<\/b>
\n\u00a0\u00a0\u00a0\u201cYet also when a many-branched tree,
\nBeaten by winds, writhes swaying to and fro,
\nPressing \u2019gainst branches of a neighbour tree,
\nThere by the power of mighty rub and rub
\nIs fire engendered; and at times out-flares
\nThe scorching heat of flame, when boughs do chafe
\nAgainst the trunks.\u201d<\/i>
\nLucretius Carus
\nThus the Roman philosopher has explained the origin of forest fires. Estimate the probability of such an ignition and its role among the factors that cause fires in nature, i.e. not caused by a human activity.<\/p>\n
11. Incandescent lamp<\/b>
\nIt is said that two 60 W light bulbs shine brighter than three 40 W bulbs. Is it true? Investigate how a small change in supplied voltage will affect light emission and a light bulb\u2019s lifetime.<\/p>\n
12. Spring in a city<\/b>
\nSpring begins in a city earlier than in the countryside. Describe the main causes of this phenomenon and make numerical estimations. In particular, what would happen if one day all snow from Moscow is removed to the countryside?<\/p>\n
13. Heat transfer<\/b> 14. Mesoscopics<\/b> 15. Copper coin<\/b> 16. Trapped electrons<\/b> 17. Cagliostro\u2019s resistor<\/b> 1. Invent yourself Suggest original projects of technical and scientific use of high-temperature superconductivity. 2. \u201cEternal radio\u201d Develop and construct a portable radio receiver that does not use power supplies. The usability parameter is\u00a0x=P\/Lm, where\u00a0P\u00a0is acoustic pressure at a distance of 1 m from the receiver,\u00a0L\u00a0is maximum linear dimension, and\u00a0m\u00a0is mass of the receiver. 3. […]<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"jetpack_post_was_ever_published":false,"footnotes":""},"class_list":["post-1984","page","type-page","status-publish","hentry"],"jetpack_sharing_enabled":true,"jetpack_shortlink":"https:\/\/wp.me\/P4R8YU-w0","jetpack-related-posts":[],"jetpack_likes_enabled":true,"_links":{"self":[{"href":"https:\/\/tmfwarszawa.pl\/index.php\/wp-json\/wp\/v2\/pages\/1984","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/tmfwarszawa.pl\/index.php\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/tmfwarszawa.pl\/index.php\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/tmfwarszawa.pl\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/tmfwarszawa.pl\/index.php\/wp-json\/wp\/v2\/comments?post=1984"}],"version-history":[{"count":1,"href":"https:\/\/tmfwarszawa.pl\/index.php\/wp-json\/wp\/v2\/pages\/1984\/revisions"}],"predecessor-version":[{"id":1986,"href":"https:\/\/tmfwarszawa.pl\/index.php\/wp-json\/wp\/v2\/pages\/1984\/revisions\/1986"}],"wp:attachment":[{"href":"https:\/\/tmfwarszawa.pl\/index.php\/wp-json\/wp\/v2\/media?parent=1984"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}
\nResearch the heat transfer through the vertical water column in the two cases:\u00a0T1<\/sub><T2<\/sub><\/i>\u00a0and\u00a0T1<\/sub>>T2<\/sub><\/i>.
\n![](\"https:\/\/i0.wp.com\/archive.iypt.org\/problems\/1IYPT_1.gif?w=648&ssl=1\")
\n\u201c1\u201d is water column, \u201c2\u201d is heat insulating tube.<\/p>\n
\nOne of the mesoscopic effects is a significant change of the resistance of a two-dimensional metal sample at low temperatures, if just a single atom within the crystal lattice is displaced. This effect can be visually illustrated if one considers the following model: small flat mirrors, with reflection coefficients equal to 1, are placed in the knots of a two-dimensional lattice\u00a0n<\/i>\u00d7n<\/i>,\u00a0n<\/i>>>1. Each mirror can exist in two positions only; it can be inclined at 45\u00b0 clockwise or counter-clockwise.
\n![](\"https:\/\/i0.wp.com\/archive.iypt.org\/problems\/1IYPT_2.gif?w=648&ssl=1\")
\nThe states of the mirrors change chaotically, so the laser beam incident on a lattice knot reflects perpendicularly from the knot in both directions with the same probability. Estimate how the output light power will change if one of the knots is replaced by an absolute light-absorbing element.<\/p>\n
\nA 1-kopeck coin \u201cfell out\u201d of a space rocket and became an artificial planet. Estimate its lifetime as of a planet of the Solar System.<\/p>\n
\nSeveral electrons (2\u2264n<\/i>\u226430) can freely move inside a circle of a radius\u00a0R<\/i>. What relative position of the electrons is stable?<\/p>\n
\nEven a human being is a resistor for a school tester. Investigate the laws of parallel and series circuits with a school tester. (Traditionally, problem No. 17 has a humorous tone.)<\/p>\n","protected":false},"excerpt":{"rendered":"