Jaką prędkość posiada ciało o energii 5kJ i masie 100g???
m = 100 g = 0,1 kg
E = 5 kJ = 5000 J
V = ?
Ek = m * V² / 2
2Ek = m * V²
V² = 2 Ek /m
V = √ 2 Ek /m
V = √ 2 * 5000 J / 0,1 kg
V ≈ 316,23 m/s
[ J / kg ] = [ N * m / kg ] = [ kg * m/s² * m/ kg ] = [ m² /s² ]
[ √m² /s² ] = [ m/s ]
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m = 100 g = 0,1 kg
E = 5 kJ = 5000 J
V = ?
Ek = m * V² / 2
2Ek = m * V²
V² = 2 Ek /m
V = √ 2 Ek /m
V = √ 2 * 5000 J / 0,1 kg
V ≈ 316,23 m/s
[ J / kg ] = [ N * m / kg ] = [ kg * m/s² * m/ kg ] = [ m² /s² ]
[ √m² /s² ] = [ m/s ]