Must know unit conversions

Question 1

5MJ (convert 5 Mega Joules to Joules)

Answer 1

Mega means x 10 6

5MJ = 5 X 10 6 J

Question 2

5kJ (convert 5kilo Joules to Joules)

Answer 2

kilo means x 10 3 (or times by 1000)

5kJ = 5 x 10 3 J

Question 3

5mJ (convert to 5 milli Joules to Joules)

Answer 3

milli means x 10-3 (or divide by 1000)

5mJ = 5 x 10 -3 J

Question 4

5 micro J (convert 5 micro Joules to Joules)

Answer 4

micro means x 10-6

5microJ = 5 x 10 -6 J

Question 5

5nJ (convert 5 nano Joules to Joules)

Answer 5

nano means x 10-9

example 5 nC = 10 x 10 -9 C

Question 6

5cm (convert centi metres to metres)

Answer 6

centi means 10-2 (or divide by 100)

5cm = 0.05m