IB Physics SL B 1 2 Density Questions

Practise calculating density from mass, volume, pressure, temperature and water’s life-supporting anomaly in exam questions.

Exam points

calculate density from mass and volume or pressure-volume changes, showing substitutions and units clearly
explain water’s density anomaly and its consequences for floating ice, tides and life in aquatic environments

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Study B.1.2—Density conceptsOpen the corresponding Concept lesson for explanations, examples and exam connections.

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This question is about a tidal power station.

A tidal power station is built for a coastal town. Sea water is stored in a tidal basin behind a dam at high tide and released in a controlled manner between high tides, so that it passes through turbines to generate electricity.

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Table for Question IB Physics SL B 1 2 Density Questions question 1 — IB Physics SL

Show that the mass of sea water released between successive high and low tides is about $2.8 \times 10^{8} \mathrm{~kg}$ .

$m=\rho \Delta V=\rho A \Delta h$ ;

\begin{aligned} & =1.1 \times 10^{3} \times 1.4 \times 10^{5} \times 1.8 ; \\ & \left(\approx 2.8 \times 10^{8} \mathrm{~kg}\right) \end{aligned}

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IB Physics SL B 1 2 Density Questions question 1