Cinemática (escalar - Fismat.net.br
Cinemática (escalar - Fismat.net.br
Cinemática (escalar - Fismat.net.br
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6<<strong>br</strong> />
Exercício resolvido<<strong>br</strong> />
Determine a partir do gráfico abaixo, a velocidade <strong>escalar</strong> média do corpo<<strong>br</strong> />
V<<strong>br</strong> />
20<<strong>br</strong> />
12<<strong>br</strong> />
∆S1<<strong>br</strong> />
Calculam-se primeiro as áreas dos retângulos<<strong>br</strong> />
a) entre 0s e 2s<<strong>br</strong> />
∆S1 = 3 x 5<<strong>br</strong> />
∆S1= 18 m<<strong>br</strong> />
b) entre 2s e 15 s<<strong>br</strong> />
∆S2 = 12 x 12<<strong>br</strong> />
∆S2 = 144 m<<strong>br</strong> />
c) entre 15s e 30s<<strong>br</strong> />
∆S3 = 25 x 20<<strong>br</strong> />
∆S3 = 500 m<<strong>br</strong> />
Como Vm = ∆S/∆t<<strong>br</strong> />
Vm = 662 /40<<strong>br</strong> />
Vm = 16,55 m/s<<strong>br</strong> />
∆S2<<strong>br</strong> />
∆S3<<strong>br</strong> />
3 15 40<<strong>br</strong> />
T