IB Physics HL A 3 14 Fuel Energy Density Questions

Practise HL fuel-energy-density calculations for rockets, power plants, vehicle range and fuel comparisons in exam questions.

Exam points

Define and apply fuel energy density as energy available per unit mass or volume with correct units.
Use energy density with mass, volume, efficiency or power to calculate available energy, consumption or operating time from complete evidence.

[Maximum number: 2]

At the end of the 30-day period, rockets are fired to bring the ISS back to its initial height. The energy density of liquid hydrogen rocket fuel is $8.5 \times 10^{3} \mathrm{MJ} \mathrm{m}^{-3}$ .

Estimate the volume of fuel needed.

$\begin{aligned} V=\frac{E}{E \text { density }} V=\mu \frac{4.5 \times 10^{9}}{8.5 \times 10^{9}}=>0.53 \mathrm{~m}^{3} \end{aligned}$

Award [2] if $0.53 \ll \mathrm{~m}^{3} \gg$ is seen as the
answer without working

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IB Physics HL A 3 14 Fuel Energy Density Questions question 1