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Physics, 24.12.2020 16:30 nakeytrag

Una dintre etapele turului ciclist al României s-a desfăşurat între localităŃile Piatra NeamŃ şi Miercurea Ciuc, pe distanŃa totală D = 150 km . Startul s-a dat la ora 09 : 00 : 00 (ora 9, 0 minute şi 0 secunde). La ora
12 : 20 : 00 , când cel mai rapid ciclist a trecut linia de sosire, distanŃa dintre primul şi ultimul ciclist era
d = 6 km . Din acest moment ultimul ciclist îşi menŃine constantă viteza 11m/s v 0 = pe distanŃa
d1 = 5500 m . Pe ultimii d2 = 500 m , încurajat de spectatori, acesta se deplasează cu acceleraŃie constantă
şi trece linia de sosire cu viteza v = 13 m/s . Etapa a cuprins la Cheile Bicazului şi o „căŃărare”, în care
cicliştii au urcat de la altitudinea h1 = 580 m la altitudinea h2 = 980m . CalculaŃi:
a. valoarea vitezei medii a celui mai rapid ciclist;
b. variaŃia energiei potenŃiale gravitaŃionale a unui ciclist având masa M = 70 kg în timpul „căŃărării” de la
Cheile Bicazului;
c. valoarea acceleraŃiei ultimului ciclist în timpul parcurgerii distanŃei d2 = 500 m înaintea liniei de sosire;
d. ora la care ultimul ciclist a trecut linia de sosire

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