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

Apply density ρ = m/V with consistent units and distinguish mass, volume and density.
Calculate or infer mass, volume or density from complete measurement and mark-scheme evidence, including unit conversions.

[Maximum number: 2]

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.

The following data are available.

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