Răspuns:
40 cm³
Explicație:
Ec = m·v²/2
2Ec = m·v
m = 2Ec/v = 2·5,4J/(10m/s) = 10,8J/(10m/s) = 0,108 kg = 108 grame
d(Al) = 2,7 g/cm³
d = m/V => V = m/d
V = 108g/(2,7g/cm²) = 40 cm³
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Răspuns:
40 cm³
Explicație:
Ec = m·v²/2
2Ec = m·v
m = 2Ec/v = 2·5,4J/(10m/s) = 10,8J/(10m/s) = 0,108 kg = 108 grame
d(Al) = 2,7 g/cm³
d = m/V => V = m/d
V = 108g/(2,7g/cm²) = 40 cm³