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.
100 exam-style questions on CIE IGCSE Physics 6.1 The Earth and the Solar System, covering 6.1.1a Rotation of the Earth, the seasons and the Moon, 6.1.1b Average orbital speed, 6.1.2a Contents of the Solar System, 6.1.2b Formation of the Solar System, 6.1.2c Gravitational field strength of a planet, and 6.1.2d Orbits and gravitational attraction. Each one has a worked solution and a mark scheme showing where the marks go.