Several scientific orbiters are currently in orbit around Mars. The table below lists data for three of these orbiters.
| Orbiter | Mission Type | Height above Mars' surface (km) | Speed (km/s) | Period (minutes) | Revolutions per day |
|---|---|---|---|---|---|
| Ares-I | atmospheric probe | 320 | 3.42 | 113.6 | 12.7 |
| Ares-II | surface imaging | 510 | 3.33 | 122.6 | 11.7 |
| Phobos-Watch | moon tracker | 850 | 3.19 |
Calculate the period of the Phobos-Watch orbiter in minutes.
[radius of Mars=3390 km][\text{radius of Mars} = 3390\text{ km}][radius of Mars=3390 km]
Calculate the number of revolutions per 24-hour day for the Phobos-Watch orbiter.
23 exam-style questions on Edexcel IGCSE Physics Motion in the universe. Each one has a worked solution and a mark scheme showing where the marks go.