The table gives information about three planets in the Solar System.
| Planet | Mass / 1024 kg10^{24}\text{ kg}1024 kg | Average distance from Sun / 106 km10^6\text{ km}106 km | Orbital period / days | Gravitational field strength at surface / N/kg\text{N/kg}N/kg |
|---|---|---|---|---|
| Earth | 5.975.975.97 | 149.6149.6149.6 | 365.2365.2365.2 | 9.89.89.8 |
| Saturn | 568568568 | 1433.51433.51433.5 | 107591075910759 | 10.410.410.4 |
| Y | 0.6420.6420.642 | 227.9227.9227.9 | 687.0687.0687.0 | 3.73.73.7 |
State the name of planet Y.
Describe the relationship shown in the table between the mass of a planet and the gravitational field strength at its surface.
Explain why 'distance from Sun' in the table is an average value.
Show that the average orbital speed of planet Y is approximately 24 km/s24\text{ km/s}24 km/s.
60 exam-style questions on CIE IGCSE Physics 6.1.2a Contents of the Solar System. Each one has a worked solution and a mark scheme showing where the marks go.