Glass door

What is the weight of glass door panel 5 mm thick height 2.1 meters and a width of 65 cm and 1 cubic dm of glass weighs 2.5 kg?

Correct answer:

m =  17.0625 kg

Step-by-step explanation:

$$\begin{gathered} h=5\mathrm{/}100={\displaystyle \frac{1}{20}}=0.05 \\ a=2.1\cdot 10=21 \\ b=65\mathrm{/}10={\displaystyle \frac{13}{2}}=6.5 \\ r=2.5 \\ V=a\cdot b\cdot h=21\cdot 6.5\cdot 0.05={\displaystyle \frac{273}{40}}=6.825 \\ m=V\cdot r=6.825\cdot 2.5={\displaystyle \frac{273}{16}}={\displaystyle \frac{273}{16}}\text{ kg}=17.0625\text{ kg} \end{gathered}$$

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