IB Physics HL B 1 2 Density Questions

Practise HL density calculations for fluids, icebergs, astrophysics and mass flow using supplied data 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: 1]

A cylindrical spacecraft of cross-sectional area S moves with velocity v. The spacecraft enters a region of dust of density $\rho$ . All the dust that comes into contact with the forward cross-sectional area of the spacecraft sticks to the spacecraft increasing its mass.

Figure for Question IB Physics HL B 1 2 Density Questions question 1 — IB Physics HL

Show that in time $\Delta t$ the mass of the spacecraft will increase by an amount $\rho \operatorname{Sv} \Delta t$ .

Identifies length of cylinder as $v \Delta t$ so volume as $S \times v \times \Delta t$ to show the result

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IB Physics HL B 1 2 Density Questions question 1