Find the mass of the window glass, which is 1.6m long, 75cm wide, 5mm thick. The mass of 1 cubic meter of glass is equal to 2600 kg.

Given:
a = 1.6 m,
b = 75 cm = 0.75 m,
c = 5 mm = 0.005 m,
m (1 m ^ 3) = 2600 kg.
Find – m.
Decision.
We need to find the volume of the window glass. And then, knowing the mass of 1 m ^ 3 of glass, determine the mass of the entire glass.
We will assume that the glass has the shape of a rectangular parallelepiped.
By definition of the volume of a rectangular parallelepiped:
V = a * b * c.
Let’s substitute numerical values into the formula:
V = 1.6 * 0.75 * 0.005 = 0.006 (m ^ 3);
m = m (1 m ^ 3) * V;
m = 2600 * 0.006 = 15.6 (kg).
Answer: m = 15.6 kg.