A crane has an arm with a frictionless pulley fixed to it. A cable runs over the pulley and carries a load of $10\,\text{kN}$ as shown. The crane arm applies a force $F$ to the pulley. What is the value of $F$?
- A$5.0\,\text{kN}$
- B$8.7\,\text{kN}$
- C$10\,\text{kN}$
- D$17\,\text{kN}$