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1.
dane:
m = 500 g = 0,5 kg
t₁ = 20°C
t₂ = 100°C
Δt = 80°C
C = 4190 J/kg·K = 4190 J/kg·°C
szukane:
Q = ?
Q = m·C·Δt
Q = 0,5kg·4190J/kg·°C·80°C = 167 600 J
1 kJ = 1000 J
Q = 167,6 kJ
=========
2.
hp = 4 cm
x = 0,16 m = 16 cm
y = 48 cm
ho = ?
Z wzoru na powiększenie:
p = y/x = ho/hp
ho/hp = y/x
ho = y·hp/x = 48cm·4cm/16cm = 12 cm
ho = 12 cm
========
3.
hp = 8 cm
ho = 0,12 m = 12 cm
p = ?
p = ho/hp
p = 12cm/8cm = 1,5
p = 1,5
=====
4.
Z prawa odbicia:
α = β
gdzie:
α - kąt padania
β - kąt odbicia
α + β = 60°
2β = 60° /:2
β = 30°
Odp. Kąt odbicia wynosi 30°
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1.
dane:
m = 500 g = 0,5 kg
t₁ = 20°C
t₂ = 100°C
Δt = 80°C
C = 4190 J/kg·K = 4190 J/kg·°C
szukane:
Q = ?
Q = m·C·Δt
Q = 0,5kg·4190J/kg·°C·80°C = 167 600 J
1 kJ = 1000 J
Q = 167,6 kJ
=========
2.
dane:
hp = 4 cm
x = 0,16 m = 16 cm
y = 48 cm
szukane:
ho = ?
Z wzoru na powiększenie:
p = y/x = ho/hp
ho/hp = y/x
ho = y·hp/x = 48cm·4cm/16cm = 12 cm
ho = 12 cm
========
3.
dane:
hp = 8 cm
ho = 0,12 m = 12 cm
szukane:
p = ?
p = ho/hp
p = 12cm/8cm = 1,5
p = 1,5
=====
4.
Z prawa odbicia:
α = β
gdzie:
α - kąt padania
β - kąt odbicia
α + β = 60°
2β = 60° /:2
β = 30°
=====
Odp. Kąt odbicia wynosi 30°