
Tekućine i plinovi - zadaci

Quiz
•
Physics
•
9th Grade
•
Easy
Lucija Matkovic
Used 5+ times
FREE Resource
5 questions
Show all answers
1.
OPEN ENDED QUESTION
5 mins • 1 pt
(2 boda) Ronilac roni u jezeru na dubini od 12 m. Kolikom silom voda djeluje na njegovu masku, ako je površina maske 0,006 m2, a gustoća vode je 1000 kg/m3?
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2.
OPEN ENDED QUESTION
5 mins • 1 pt
(2 boda) Tijelo mase 6 kg uronjeno je u propilni alkohol gustoće 803 kg/m3. Ako volumen tijela iznosi 0,003 m3, koliko to tijelo "teži" u alkoholu?
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3.
OPEN ENDED QUESTION
5 mins • 1 pt
(2 boda) Kolikom silom trebamo djelovati na jedan klip hidrauličke dizalice čija je površina 0,003 m2 da bi na drugom klipu podigli teret mase 1200 kg. Površina drugog klipa je 0,1 m2.
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4.
OPEN ENDED QUESTION
15 mins • 1 pt
(3 boda) Statički tlak u širem dijelu horizontalne cijevi kroz koju struji voda brzinom 0,5 m/s, iznosi 93 kPa. Odredite brzinu vode kroz uži dio cijevi ako je statički tlak u njoj 75 kPa. Gustoća vode iznosi 1000 kg/m3.
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5.
OPEN ENDED QUESTION
15 mins • 1 pt
(4 boda) U prizemlju neke zgrade tlak vode je 350 kPa, a njezina brzina je 0,8 m/s.
a) Kolika je brzina vode na sedmom katu te zgrade, ako je polumjer cijevi upola manji nego u prizemlju.
b) Koliki je tlak vode na sedmom katu, ako se sedmi kat nalazi na visini od 21 m u odnosu na prizemlje.
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