ρ=0.8×1000=800 kg/m3rho equals 0.8 cross 1000 equals 800 kg/m cubed Gustoća drveta iznosi Zadatak 2: Pronalaženje mase preko gustoće i volumena Zadatak: Kolika je masa aluminijske kuglice volumena ako je gustoća aluminija Rješenje: Zapišimo podatke: Izvedimo formulu za masu: m=ρ×Vm equals rho cross cap V Izračunajmo:
p=FSp equals the fraction with numerator cap F and denominator cap S end-fraction Jedinica za tlak je Pascal ( Zadatak 5: Tlak na podlogu Kutija mase
a) 5000 g = 5000 × 0.001 kg = 5 kg b) 250 dag = 250 × 0.01 kg = 2.5 kg (1 dag = 10 g = 0.01 kg) c) 1.2 t = 1.2 × 1000 kg = 1200 kg fizika 7 razred zadaci i rjesenja top
Sila uzgona: ( F_u = \rho_tek \cdot g \cdot V_uronjenog )
I'll interpret this as: , centered around the topic of force, motion, and a cannon ("top"). ((g = 10\ \textm/s^2), ignore air resistance) [
A 0.5 kg ball is dropped from height 5 m. What is its speed just before hitting ground? ((g = 10\ \textm/s^2), ignore air resistance)
[ v = \fracst \quad \Rightarrow \quad s = v \cdot t, \quad t = \fracsv ] Where: (v) = speed (m/s or km/h), (s) = distance (m or km), (t) = time (s or h) Force = weight = (50 \cdot 10 =
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Force = weight = (50 \cdot 10 = 500\ \textN) Area in m²: (2\ \textcm^2 = 0.0002\ \textm^2) [ p = \frac5000.0002 = 2,500,000\ \textPa = 2.5\ \textMPa ] (Very high – that’s why heels damage floors.)