The diagram depicts a beam resting on the ground. Force $F$ lifts end $Q$ away from the ground. End $P$ of the beam stays in contact with the ground. The beam has a length of $3.0\,\text{m}$ and a weight of $600\,\text{N}$. Its centre of mass at $G$ is $1.0\,\text{m}$ from end $P$. What is the magnitude of the force $F$ when end $Q$ has just started to leave the ground?
- A$200\,\text{N}$
- B$300\,\text{N}$
- C$400\,\text{N}$
- D$600\,\text{N}$