A rigid rod XY, of negligible mass, is $75\,\text{cm}$ long. It is hung from a fixed point P using a string fixed to end X. A mass of $11\,\text{kg}$ is hung by a string attached to the rod $25\,\text{cm}$ from end X, as illustrated. What vertically upward force applied at end Y of the rod would keep the rod in horizontal equilibrium?
- A$3.7\,\text{N}$
- B$33\,\text{N}$
- C$36\,\text{N}$
- D$320\,\text{N}$