The Earth travels around the Sun at 30 km per second.
Convert 30 km per second into miles per second. [2]
(b)
(i)
The diagram shows a field. It has an area of 1 square mile.
Diagram not drawn to scale
What is the area of the field in square kilometres? [2]
(ii)
The surface area of the Earth is about two hundred million square miles.
Calculate the surface area of the Earth in square kilometres. [2]
Mark scheme (a)
Scheme
Marks
Comments
30 ÷ 1.6
M1
18.75 (miles per second)
A1
Do not ISW but award M1A0 if 30 ÷ 1.6 or 18.75 are seen with further incorrect work.
Mark scheme (b)
Scheme
Marks
Comments
(i) 1.6 × 1.6 or 1.6\(^2\)
M1
2.56 (km\(^2\))
A1
(ii) 512 million or 512 000 000
B2
FT their answer to (b)(i) and award: B2 for the correct evaluation of 200 000 000 × ‘their 2.56’ For example, with an answer of 4 in (i) award B2 for 800 000 000 or 800 million
B1 for the correct evaluation of 20 000 000 × ‘their 2.56’ OR 2 000 000 000 × ‘their 2.56’ (a place value error of a power of 10 only)
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