
Rad i energija - zadaci
Quiz
•
Physics
•
9th Grade
•
Practice Problem
•
Medium
Lucija Matkovic
Used 9+ times
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5 questions
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1.
OPEN ENDED QUESTION
3 mins • Ungraded
(4 boda) Biciklist započinje spuštanje s vrha brda visine h i na dnu brda postigne brzinu 15 m/s. Koristeći zakon očuvanja energije izračunajte s koje je visine započeo gibanje. (g=10 m/s2)
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2.
OPEN ENDED QUESTION
3 mins • Ungraded
(4 boda) Kamen je bačen s vrha zgrade visoke 50 m vertikalno uvis početnom brzinom 6 m/s. Pri padu kamen promaši rub zgrade i pada na tlo ispred zgrade. Koristeći zakon očuvanja energije nađite maksimalnu visinu koju kamen dosegne u odnosu na tlo i kojom brzinom udari o tlo. (g=10 m/s2)
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3.
OPEN ENDED QUESTION
3 mins • Ungraded
(2 boda) Snaga motora dizalice iznosi 5000 W. Ako dizalica podigne teret mase 950 kg u 2 minute, izračunaj na koju je visinu podignut taj teret. (g =10 m/s2)
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4.
OPEN ENDED QUESTION
3 mins • Ungraded
(2 boda) Korisnost nekog stroja je 88%. Ako taj stroj može obaviti rad od 8800 J u 10 s, kolika je njegova snaga (uložena iz električne mreže)?
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5.
OPEN ENDED QUESTION
3 mins • Ungraded
(3 boda) Dizalicu pokreće motor snage 7500 W i njena korisnost je 75%. Na koju visinu ta dizalica podiže teret mase 200 kg ako joj je za to potrebno 50 s?
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