Physics

Problem

Two horizontal forces act on a particle:

\vec F_1=12\,\text{N}

due east and

\vec F_2=5\,\text{N}

due north. The magnitude of the least third horizontal force that must be applied to keep the particle in equilibrium is a)

17\,\text{N}

7\,\text{N}

13\,\text{N}

12\,\text{N}