A rectangular iron block with a density of 7.9 * 10 ^ 3kg / m ^ 3 is 20cm long, 10cm wide and 5cm thick. How much pressure does the iron block exert on the desktop when it is placed horizontally or vertically?

The pressure is 7.9 * 103kg / m3 * 0.2 * 0.1 * 0.05 * 10N / kg = 79n
Horizontal = s = 0.2 * 0.1 = 0.02m2, P = 79 / 0.02 = 3950pa
Vertical = s = 0.1 * 0.05 = 0.005 P = 79 / 0.005 = 15800pa

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