What are the values of N1 and N2, respectively, in the figure below? The figure shows a 30 kg, 5 m long bar supported at two points and subject to...
What are the values of N1 and N2, respectively, in the figure below?
The figure shows a 30 kg, 5 m long bar supported at two points and subject to three forces: F1=5N, located at the first support point, F2=10N, located 1m from N1, and F3=15N, located 1.5m from A.
The gravitational acceleration is 10.
To determine the normal forces N1 and N2, we must first consider one of these forces as the support point.
a) -17,5 N and -62,5 N
b) 17,3 N and 62,2 N
c) -17,1 N and 62,9 N
d) 17,5 N and -62,0 N
The figure shows a 30 kg, 5 m long bar supported at two points and subject to three forces: F1=5N, located at the first support point, F2=10N, located 1m from N1, and F3=15N, located 1.5m from A.
The gravitational acceleration is 10.
To determine the normal forces N1 and N2, we must first consider one of these forces as the support point.
a) -17,5 N and -62,5 N
b) 17,3 N and 62,2 N
c) -17,1 N and 62,9 N
d) 17,5 N and -62,0 N
💡 1 Resposta
Ed 
Para determinar as forças normais N1 e N2, devemos primeiro considerar uma dessas forças como ponto de apoio. Vamos considerar N1 como ponto de apoio. Somando as forças na direção vertical, temos: N1 + N2 - 30g = 0 N1 + N2 = 300 (1) Somando as forças na direção horizontal, temos: F1 + F2 + F3 = 0 5 - 10 - 15 = -10N2 N2 = 3,3 N (2) Substituindo (2) em (1), temos: N1 + 3,3 = 300 N1 = 296,7 N Portanto, as forças normais N1 e N2, respectivamente, são 296,7 N e 3,3 N. A alternativa correta é a letra B.
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