Question

Which quantity is equal to 50 kilojoules?
(I ) 0.05J (3) 5 x 103J(2) 500J (4) 5 x 104J

Answer 1

The word "kilo" is a prefix, which is equal to 10^(3). Therefore, 50 kilojoules is 50*10^(3)J, which is 5*10^(4)J.
(4) 5*10^4J is the correct answer.
Hope this would help~

Answer 2

Answer:

D. 5 x 104J

Explanation:

From Reference Table C, “kilo-” means 1,000. 5 × 104 J = 50,000 joules = 50 kilojoules.