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2023 · O/N · 5054/22 | Q2

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CIE-5054-2023-ON-p22 · Question 2

Theory: answer each printed part. For drawings, upload a clear photo of your sketch on the supplied figure; show working and units for calculations.
(a)

A 300 kg spacecraft moves in a straight line at 8000 m/s.

Calculate the momentum of the spacecraft.

Answer guidance

Calculate Show your working. The method can earn marks even when the final value is wrong, and a bare answer often cannot.

[2 marks]
(b)(i)

The fuel explodes, splitting the spacecraft into two parts moving in the original direction. After the explosion, the 150 kg front part moves at 9000 m/s. Calculate the speed of the rear part.

Answer guidance

Calculate Show your working. The method can earn marks even when the final value is wrong, and a bare answer often cannot.

[3 marks]
(b)(ii)

The fuel explodes, splitting the spacecraft into two parts moving in the original direction. The two parts have more total kinetic energy after the explosion. State the energy transfer in the explosion.

Answer guidance

State A short answer. No explanation is needed, and adding one cannot earn extra marks.

[1 mark]
(b)(iii)

The fuel explodes, splitting the spacecraft into two parts moving in the original direction. The 150 kg front part accelerates from 8000 m/s to 9000 m/s in 0.20 s. Calculate the average force on that part.

Answer guidance

Calculate Show your working. The method can earn marks even when the final value is wrong, and a bare answer often cannot.

[3 marks]

5054/22/O/N/23Cambridge O Level Physics 5054 · Oct/Nov 2023 · Paper 2 variant 2 · Question 2