Ahojte, prosím Vás pomôže mi niekto?
1. Akou silou dvíhal žeriav teleso po zvislej dráhe 5 m rovnomerným pohybom, ak vykonal prácu 15 kJ?
2. Do akej výšky bolo zdvihnuté teleso, keď naň pôsobili silou 50 N a pri tom sa vykonala práca 100 J?
3. Akú veľkú prácu vykonáme, ak zdvihneme tehlu so silou 200 N rovnomerným pohybom do výšky 0,1 km?
4. Akú prácu vykoná traktor, ktorý ťahá vlečku po dráhe 1 km stálou silou 5 000N?
Vopred ďakujem veľmi pekne .
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