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Problems
7.1 A wooden block measuring 40 cm x 10 cm x 5 cm has a mass of 850 g. Find the density of the wood.
7.2 How much would be the volume of the ice formed by freezing 1 liter of water?
7.3 (i) Calculate the volume of an iron sphere of mass 5 kg with a density of iron as 8200 kg/m³.
7.3 (ii) Calculate the volume of 200 g of lead shot with a density of 11300 kg/m³.
7.3 (iii) Calculate the volume of a gold bar with a mass of 0.2 kg and a density of 19300 kg/m³.
7.4 Find the mass of air in a room measuring 8m x 5m x 4m with a density of air as 1.3 kg/m³.
7.5 A student applies a force of 75 N with a contact area of 1.5 cm². Find the pressure under her thumb.
7.6 The head of a pin is a square with a side of 10 mm. Find the pressure on it due to a force of 20 N.
7.7 (i) Find the pressure exerted by a rectangular block of wood on the surface with its longest edge vertical.
7.7 (ii) Calculate the density of a wooden block with given dimensions and mass.
7.8 A glass cube with a side of 5 cm and mass of 306 g has a cavity inside. Find the volume of the cavity.
7.9 An object weighs 18 N in air and 11.4 N in water. Calculate its density and identify the material.