The thickness of one window glass is 2 mm, the width is 50 cm, the height is 1 m, the corresponding dimensions

| August 24, 2021 | education

The thickness of one window glass is 2 mm, the width is 50 cm, the height is 1 m, the corresponding dimensions of the other glass are 3 mm, 40 cm, 80 cm. The mass of which glass is more and how much?

These tasks: dimensions of the first glass: h1 (thickness) = 2 mm = 2 * 10-3 kg; S1 (width) = 50cm = 0.5m; L1 (height) = 1 m; dimensions of the second glass: h2 (thickness) = 3 mm = 3 * 10-3 kg; S2 (width) = 40cm = 0.4m; L1 (height) = 80cm = 0.8m.

Constants: ρst (density of window glass) = 2500 kg / m3.

1) The mass of the first window glass: m1 = ρst * V1 = ρst * h1 * S1 * L1 = 2500 * 2 * 10-3 * 0.5 * 1 = 2.5 kg.

2) The mass of the second window glass: m2 = ρst * V2 = ρst * h2 * S2 * L2 = 2500 * 3 * 10-3 * 0.4 * 0.8 = 2.4 kg.

3) Comparison of glass masses: Δm = m1 – m2 = 2.5 – 2.4 = 0.1 kg (100 g).

Answer: The first glass pane has a mass of 100 g more.



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