A 1200-kg concrete slab that measures 2 m X 1 m X 20 cm is delivered to a building under construction. Does the slab contain steel reinforcing rods or is it plain concrete?

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To determine whether the concrete slab contains steel reinforcing rods or if it is plain concrete, we can calculate its density.

First, let's find the volume of the concrete slab. The dimensions are given as 2 m X 1 m X 20 cm. Since the thickness is given in centimeters, we need to convert it to meters:

Thickness (m) = 20 cm / 100 = 0.2 m

Now we can calculate the volume of the slab:

Volume = length × width × thickness
Volume = 2 m × 1 m × 0.2 m
Volume = 0.4 m³

Next, we can calculate the density of the concrete slab using the given mass and volume:

Density = mass / volume
Density = 1200 kg / 0.4 m³
Density = 3000 kg/m³

The density of plain concrete typically ranges from 2200 kg/m³ to 2500 kg/m³, while concrete with reinforcing steel rods can have a density of about 2500 kg/m³ to 2900 kg/m³.

In this case, the slab has a density of 3000 kg/m³, which suggests that it likely contains steel reinforcing rods.