trabalho e energia
TRANSCRIPT
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Energia e Trabalho
Wendel Vasconcelos
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W Fs
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cos cos90 0dW Tds Tds Fds
0dW
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1 2 3 4
i
R
W F s F s F s F s
W F s
W F s
F1
F2
F3
F4
s
FR
s
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2 1W F x F x x
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21 1 1base altura
2 2 2W X kX kX
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21
2K mv
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Corpo Massa (kg) Velocidade (m/s) Energia cinética (J)
Elétron em sua
órbita 9,1×10-31 2,2×106 2,1×10-18
Bola de basquete
durante um passe 0,600 10 30
Bola de tênis
durante um saque
0,058 45 59
Bola de futebol
durante um chute
0,454 30 204
Bola de vôlei após
uma cortada
0,270 50 338
Terra em sua órbita
6,0×1024 3,0×104 2,7×1033
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2 2
2 1 2v v as
2 2
2 1
2
v va
s
2 2
2 1
2m
v va m
s
2 2
res 2 1
1 1
2 2F s mv mv
res 2 2W K K
21
2K mv
tot 2 1W K K K
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res 0 0W K K K K K
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2
0
10
2W K K K K K mv
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WP
t
0limt
W dWP
t dt
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Carro Potência
(cv)
Velocidade
máxima (km/h)
Tempo gasto de
0 a 100 km/h
Uno Mille
Fire 1.0 55 151 17,8
Corsa 1.4
Premium 105 177 11,8
Audi A4 3.2
FSI 270 250 8,0
BMW 645 CI
333 250 7,1
Formula 1*
980 360 1,7
Top Fuel
Dragster* 9000 530 0,6
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22
0
0
1 10 1.050 kg 143 m/s
2 2
0 4,5 s
mvK KW K
Pt t t t t
2,39 MW 3.200 hpP
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