Respostas

2014-07-09T17:45:32-03:00
A) Angulo 0°

Fr = F2-F1
Fr = 8 - 6
Fr = 2N

b) Angulo 60°

Fr² = F1² + F2² + 2*F1*F2*cos60
Fr² = 6² + 8² + 2*6*8*0,5
Fr² = 36 + 64 + 48
Fr² = 148
Fr = V148
Fr =~12,17N