4.3. Density and pressure
A subsection of Physics, 9702, through 4. Forces, density and pressure
Listing 10 of 120 questions
A sphere floats in equilibrium on the surface of sea water of density 1050 kg m−3, as shown in . sphere sea water, density 1050 kg m–3 21% of the volume of the sphere is below the surface of the water. Calculate the density of the sphere. density = kg m−3 The sphere is now held so that its entire volume is below the surface of the water. The sphere is then released. Calculate the initial acceleration of the sphere. acceleration = m s−2 The sphere accelerates upwards but remains entirely below the surface of the water. State and explain what happens to the acceleration of the sphere as its velocity begins to increase.
9702_s23_qp_23
THEORY
2023
Paper 2, Variant 3
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Define pressure. Explain, in terms of the air molecules, why the pressure at the top of a mountain is less than at sea level. shows a liquid in a cylindrical container. 0.250 m container liquid The cross-sectional area of the container is 0.450 m2. The height of the column of liquid is 0.250 m and the density of the liquid is 13 600 kg m–3. Calculate the weight of the column of liquid. weight = N Calculate the pressure on the base of the container caused by the weight of the liquid. pressure = Pa Explain why the pressure exerted on the base of the container is different from the value calculated in .
9702_w12_qp_21
THEORY
2012
Paper 2, Variant 1
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Questions Discovered
120