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Exercício de estatistica de corpos extensos
Exercício:
1)(PUC-PR) A barra homogênea e uniforme mostrada abaixo tem peso igual a 2000 N está em equilíbrio sobre dois apoios. A Força de reação no apoio B vale:
(a) 2000 N; (b) 1000 N; (c) 1500 N; (d) 1250 N; (e) 2250 N.
2)(Fuvest 1988) Dois homens estão carregando uma viga de madeira nas posições A e B indicadas na figura. Se a viga é homogênea e pesa 40Kgf, qual a carga suportada por cada um?
_________4m____________________/__1m__…
3) uma prancha uniforme de comprimento 8,0 m está apoiada sobre dois suportes distantes 6,0 m um do outro. Supondo que a massa da prancha seja 12 kg, determine, em newtons, a força exercida por cada suporte sobre a barra. Considere g= 10m/s2
Informações Adicionais:
preciso urgente, por favor me ajudem!!!!!!
1) Se Fa+Fb=2000N
8Fa=2000N.3
Fa=6000/8
Fa 750N
Agora substitua:
Fa+Fb=2000N
750N+Fb=2000N
Fb=2000N-750N
Fb=1250N
Resposta: D
2)Se Fa+Fb= 40N
4Fa=40.1,5
Fa=15N
Substituindo:
Fa+Fb=40N
15N+Fb=40N
Fb=40N-15N
Fb=25N
3) F1+F2=12kg.10ms²
6.F1=120N.2
F1=240/6
F1=40N
F1+F2=120N
40N+F2=120N
F2=120N
F2=80N
RA+RB = 2000
8.RB – 5.P = 0
8.RB = 5.(2000)
8RB = 10000
RB = 10000/8
RB = 1250 Newtons
queria saber porque na 2 o cara multiplicou 40 por 1,5, o 40 sei q é os 40 kgf, mas e esses 1,5 aew, se tiro de onde fera?
“queria saber porque na 2 o cara multiplicou 40 por 1,5, o 40 sei q é os 40 kgf, mas e esses 1,5 aew, se tiro de onde fera?” tambem queria saber.
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