Two forces F 1 and F 2 act on a particle. F 1 = 3i + 7j

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Two forces F1 and F2 act on a particle.

F1 = −3i + 7j newtons

F2 = i − j newtons

The resultant force R acting on the particle is given by R = F1 + F2.

a. Calculate the magnitude of R in newtons.

b. Calculate, to the nearest degree, the angle between the line of action of R and the vector j.

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