{"id":1974,"date":"2021-02-23T10:06:48","date_gmt":"2021-02-23T10:06:48","guid":{"rendered":"https:\/\/tmfwarszawa.pl\/?page_id=1974"},"modified":"2021-02-23T10:06:48","modified_gmt":"2021-02-23T10:06:48","slug":"zadania-1993-ang","status":"publish","type":"page","link":"https:\/\/tmfwarszawa.pl\/index.php\/zadania-1993-ang\/","title":{"rendered":"Zadania 1993 (ang)"},"content":{"rendered":"

1. Think up a problem yourself<\/b>
\nInvent a problem in which an object is moving in some way and then changes its state of motion abruptly as a result of some influence. In this process interesting phenomena may arise which you must explain by, for example, making experiments and performing the necessary calculations.<\/p>\n

2\u20145. Gravitation<\/b>
\nImagine that the gravitational constant\u00a0G<\/i>\u00a0decreases slowly from April 1, 1993 until May 1, 1994 by 10% and keeps this value afterwards. How would this process in the given time interval and up to the date of the VI International YPT opening affect the universe as a whole and, in particular,<\/p>\n

2.<\/b>\u00a0the Sun;<\/p>\n

3.<\/b>\u00a0the Earth;<\/p>\n

4.<\/b>\u00a0aviation and astronautics;<\/p>\n

5.<\/b>\u00a0things important for you personally.<\/p>\n

6. Gagarin\u2019s record<\/b>
\nIn April 1961 Yury Gagarin set a world record for the fastest round-the-world orbit space flight. Suggest the cheapest way of beating this record. Note that not every record may be officially recognized.<\/p>\n

7. Pressure and temperature<\/b>
\nExplain why the pressure inside a house and outdoors are practically the same or become equal briefly, while the temperature may be substantially different. What is the characteristic equalizing time for pressures and temperature in- and outdoors? What is the answer to this question in the case of spacecraft?<\/p>\n

8. Dominoes<\/b>
\nDominoes are placed vertically at a small distance from each other in a long row on a table surface. Make the first domino fall and the \u201cwave of the falls\u201d will proceed along the row. Calculate and measure experimentally the maximum speed of this wave.<\/p>\n

9\u201410. Gun<\/b>
\nThe picture shows an electromagnetic gun circuit. It can launch metal rings.
\n
\n(S, C, K) is a power supply consisting of
\nS, a source of constant voltage in the range 10\u2014300 V,
\nC, a capacitor with\u00a0C<\/i>=1000 \u03bcF,
\nK, a switch;
\nL is an induction coil;
\nF is a ferromagnetic core;
\nR is a metal ring projectile with mass from 1 to 100 g.
\nCn<\/sub>\u00a0is a converter (some device that converts the energy passing from the capacitor to inductance L in a way you need.) This element does not contain energy sources. It may be completely absent from your gun.
\nYou are to construct, make and demonstrate the electromagnetic gun. It is worth mentioning that the demonstration of your gun will take place with the power supply (elements S, C and K) presented by the Organizing Committee of the YPT. Develop two variants of the gun:<\/p>\n

9. A long-range gun<\/b>\u00a0is to be constructed to shoot a ring to a maximum altitude. The control parameter is the quantity\u00a0H=kh\/U2<\/sup><\/i>, where\u00a0k<\/i>=10000\u00a0V2<\/sup><\/i>,\u00a0h<\/i>\u00a0is the height of the projectile,\u00a0U<\/i>\u00a0is the voltage to which the capacitor is charged.<\/p>\n

10. A gun-lift<\/b>\u00a0is to be constructed to achieve the maximum work of lifting a weight (ring). The control parameter is\u00a0W=mgh<\/i>, where\u00a0m<\/i>\u00a0is the mass of the ring,\u00a0g<\/i>=10 m\/s2<\/sup>.<\/p>\n

11. Recharge<\/b>
\nYou are given a capacitor\u00a0C<\/i>=1000 \u03bcF charged to 10 V and an uncharged capacitor\u00a0Cx<\/sub><\/i>=1 \u03bcF. Using a self-constructed device containing no energy sources charge the capacitor\u00a0Cx<\/sub><\/i>\u00a0to the maximum possible voltage.<\/p>\n

12. Transmission of energy<\/b>
\nYou are given a capacitor\u00a0C<\/i>=1000 \u03bcF charged to 300 V. Transmit without wires to a distance of 5 meters the largest possible proportion of the energy stored in the capacitor and measure it. Your device should be without energy sources.<\/p>\n

13. Microwave oven<\/b>
\nWhy it is not recommended to cook eggs with unbroken shells in a microwave oven?<\/p>\n

14. Boiling<\/b>
\nA metal ball at room temperature is plunged into a thermos filled with liquid nitrogen. Describe the observed process of intense vaporization of nitrogen and find the time dependence of vaporization intensity\u00a0q(t)<\/i>\u00a0[gs\u22121<\/sup>]. We ask you to use balls from 2 to 4 cm in diameter.<\/p>\n

15. Fence<\/b>
\nA picture of a moving bicycle wheel is strongly distorted by being observed through a fence. How much is the wheel distorted and why?<\/p>\n

16. Grand Unification<\/b>
\nAccording to modern views Grand Unification is possible at energy of about 1024<\/sup>\u00a0eV. Estimate the parameters of an accelerator capable of producing particles of such energy.<\/p>\n

17. Karate<\/b>
\nKarate is power, speed, force and beauty! Develop objective quantitative criteria making it possible to confer a \u201cblack belt\u201d to a karate fighter. Maybe, you\u2019ll become the inventor of a BB (black belt) device badly needed by referees or you\u2019ll create a KM (karate meter) complex which is even more necessary for karate fighters for improving their skill.<\/p>\n","protected":false},"excerpt":{"rendered":"

1. Think up a problem yourself Invent a problem in which an object is moving in some way and then changes its state of motion abruptly as a result of some influence. In this process interesting phenomena may arise which you must explain by, for example, making experiments and performing the necessary calculations. 2\u20145. Gravitation […]<\/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-1974","page","type-page","status-publish","hentry"],"jetpack_sharing_enabled":true,"jetpack_shortlink":"https:\/\/wp.me\/P4R8YU-vQ","jetpack-related-posts":[],"jetpack_likes_enabled":true,"_links":{"self":[{"href":"https:\/\/tmfwarszawa.pl\/index.php\/wp-json\/wp\/v2\/pages\/1974","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=1974"}],"version-history":[{"count":1,"href":"https:\/\/tmfwarszawa.pl\/index.php\/wp-json\/wp\/v2\/pages\/1974\/revisions"}],"predecessor-version":[{"id":1976,"href":"https:\/\/tmfwarszawa.pl\/index.php\/wp-json\/wp\/v2\/pages\/1974\/revisions\/1976"}],"wp:attachment":[{"href":"https:\/\/tmfwarszawa.pl\/index.php\/wp-json\/wp\/v2\/media?parent=1974"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}