Réponse :
Explications :
Ec=(1/2) x m x r² x f²
m = 40g = 0.04 kg
r = 40 cm = 0.4 m
f = 50 Hz
Ec=(1/2) x 0.04 x 0.4² x 50²
Ec= 800 Joules
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Réponse :
Explications :
Ec=(1/2) x m x r² x f²
m = 40g = 0.04 kg
r = 40 cm = 0.4 m
f = 50 Hz
Ec=(1/2) x 0.04 x 0.4² x 50²
Ec= 800 Joules
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