Express in scientific notation. choose the answer with the proper number of significant figures. 69,000,000,000 =

The answer is 6.9 times 10 to the power of 10 (6.6E10). By moving a decimal point in 69,000,000,000 to where there is only one non-zero digit to the left of the decimal, the number becomes 6.9. Scientific notation is all about times 10 to the power of something, so in order to get the power of number, simply count back from where the decimal point was entered to the end of the original number, which would amount to 10 spaces, therefore giving an answer of 6.9 times 10 to the power of 10.

Work done = force ×distancebut force = mass ×gravityand gravity = 10m\s force = 2×10 = 20 work done = 20×3 = 60 joules