(a)[2]
The kilogram, metre and second are all SI base units. State two further SI base units.
(b(i))[1]
State the name given to force X.
(b(ii))[2]
Using moments about end B, calculate the beam’s weight $W$.
(b(iii))[1]
Determine the size of force X.
(b)
A uniform beam $AB$ with length $6.0\,\text{m}$ is placed on a horizontal surface, then inclined at $31^\circ$ to the horizontal, as shown in Fig. 2.1. The beam remains in equilibrium under four coplanar forces. A force of $90\,\text{N}$ acts perpendicular to the beam at end $A$. The beam’s weight $W$ acts at its centre of gravity. At end $B$ of the beam, a vertical force $Y$ and a horizontal force $X$ both act.