O-LevelMathematicsNumber4024/11 · Oct/Nov 2015 · Q163 Marks
The mass of a dust particle is approximately 0.0000753 g. Write this mass in standard form.
- (a)The mass of a dust particle is approximately 0.0000753 g. Write this mass in standard form.[1]
- (b)The mass of the Earth is 5.972 × 10^24 kg. The mass of the Moon is 7.3 × 10^22 kg. Find the total mass, in kg, of the Earth and the Moon. Give your answer in standard form.[2]
Mark scheme
Marking points from the official mark scheme (Oct/Nov 2015). The mark or mark type is shown in brackets.
- [1] (a) 7.53 × 10^-5
- [2] (b) 6.045 x 10^24
- [2] C1 for figs. 6.0(4)5 or for A × 10^24 where 1 ≤ A < 10
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