2 10 c 36 10 45 10 d 82 10 4 10

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: 10 ) × (2.1 × 10 ) (b) (6 × 10 ) × (8.2 × 10 ) (c) (3.6 × 10 ) × (4.5 × 10 ) (d) (8.2 × 10 ) ÷ (4 × 10 ) (e) (1.92 × 10 ) × (3.2 × 10 ) (f) (6.2 × 10 ) 6 4 5 7 6 − 11 53 − 11 21 −8 11 14 3 MEP Y9 Practice Book A 3.4 10. The radius of the earth is 6.4 × 10 6 m. Giving your answers in standard form, correct to 3 significant figures, calculate the circumference of the earth in: (a) m (b) cm (c) mm (d) km 11. Sir Isaac Newton (1642-1727) was a mathematician, physicist and astronomer. In his work on the gravitational force between two bodies he found that he needed to multiply their masses together. (a) Work out the value of the mass of the Earth multiplied by the mass of the Moon. Give your answer in standard form. Mass of Earth = 5.98 × 10 24 kg Mass of Moon = 7.35 × 10 22 kg Newton also found that he needed to work out the square of the distance between the two bodies. (b) Work out the square of the distance between the Earth and the Moon. Give your answer in standard form. Distance between Earth and Moon = 3.89 × 10 5 km Newton's formula to calculate the gravitational force (F) between two Gm1 m 2 where bodies is F = R2 G is the gravitational constant, m 1 and m 2 are the masses of the two bodies, and R is the distance between them. (c) Work out the gravitational force (F) between the Sun and the Earth Gm1 m 2 using the formula F = with information in the box below. R2 Give your answer in standard form. m 1 m 2 = 1.19 × 10 55 kg 2 R 2 = 2.25 × 10 16 km 2 G = 6.67 × 10 − 20 (KS3/95/Ma/Levels 6-8/P1) 54 MEP Y9 Practice Book A 12. (a) Which of these statements is true? (i) 4 × 10 3 is a larger number than 4 3 . (ii) 4 × 10 3 is the same size as 4 3 . (iii) 4 × 10 3 is a smaller number than 4 3 . Explain your answer. (b) One of the numbers below has the same value as 3.6 × 10 4 . Write down the number. 36 3 (c) (3.6 × 10) 4 36 4 0.36 × 10 5 One of the numbers below has the same value as 2.5 × 10 − 3 . Write down the number. 25 ×...
View Full Document

This document was uploaded on 03/03/2014 for the course O-LEVEL Mathematic at Beaconhouse School System.

Ask a homework question - tutors are online