A beam that is pivoted carries a load $P$ at one end and a load $Q$ at the opposite end. The beam’s weight may be neglected. The beam is in equilibrium. Which row gives possible values for $P$ and for $Q$?
- A$P = 21\,\text{N},\ Q = 7\,\text{N}$
- B$P = 21\,\text{N},\ Q = 9\,\text{N}$
- C$P = 30\,\text{N},\ Q = 10\,\text{N}$
- D$P = 30\,\text{N},\ Q = 70\,\text{N}$