| Date | May 2010 | Marks available | 1 | Reference code | 10M.1.SL.TZ1.19 |
| Level | Standard level | Paper | Paper 1 | Time zone | Time zone 1 |
| Command term | Question number | 19 | Adapted from | N/A |
Question
The weight of an object of mass 1 kg at the surface of Mars is about 4 N. The radius of Mars is about half the radius of Earth. Which of the following is the best estimate of the ratio below?
mass of Marsmass of Earth
A. 0.1
B. 0.2
C. 5
D. 10
Markscheme
A
Examiners report
The inverse square law means that halving the radius of a planet results in quadrupling the gravitational field strength at its surface.
