Question
An opening in a floor is covered by a $1 \times 1.2-\mathrm{m}$ sheet of plywood with a mass of $18 \mathrm{kg}$. The sheet is hinged at $A$ and $B$ and is maintained in a position slightly above the floor by a small block $C$. Determine the vertical component of the reaction ( $a$ ) at $A,(b)$ at $B$, (c) at $C$.
Step 1
The weight $W$ is given by the mass $m$ times the acceleration due to gravity $g$. Here, $m = 18 \, \text{kg}$ and $g = 9.81 \, \text{m/s}^2$. So, $W = m \cdot g = 18 \, \text{kg} \cdot 9.81 \, \text{m/s}^2 = 176.58 \, \text{N}$. Show more…
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