Pearson Edexcel International GCSE (9–1) · PHYSICS · Chapter
Density and Pressure
72 practice questions
Topics covered
Practice questions
71–72 of 72
Question 71
4 marks · Normal
Answer and see the solution →A diver descends to a depth of 25 m in the sea. The density of seawater is 1050 kg/m³.
(a)[2 marks]Calculate the increase in pressure on the diver at this depth due to the water alone. Use g = 10 N/kg. Give your answer in kPa.
(b)[2 marks]State and explain why the pressure inside the diver's air tank must be greater than the pressure at this depth.
Question 72
5 marks · Normal
Answer and see the solution →A student is investigating the density of a small irregular-shaped stone. She records the following measurements:
Measurements taken by the student. Measurement Value Mass of stone 65 g Initial volume of water in measuring cylinder 85 cm³ Final volume of water + stone 107 cm³ (a)[1 mark]Calculate the volume of the stone.
(b)[2 marks]Calculate the density of the stone in g/cm³.
(c)[2 marks]If the stone is placed on a sandy surface and exerts a downward force equal to its weight, with a contact area of 1.3 cm², calculate the pressure (in Pa) the stone exerts on the sand. (Take g = 10 N/kg; 1 cm² = 0.0001 m²)