The per expression in this problem is 7 days/week, and you can also write it as 1 week/ 7 days, or as an equality where 7 days = 1 week. This problem was solved using dimensional analysis and involves a per expression as a conversion factor. How would you figure this out? You know that there are 7 days in a week, so there are 4 weeks x 7 days per week = 28 days. How many days are there in 4 weeks? 28 days. If the decimal point has to be moved to the left, n is a positive integer if the decimal point has to be moved to the right, n is a negative integer.Įxamples: 8162 requires the decimal to be moved 3 places to the leftĠ.054 requires the decimal to be moved 2 places to the right = 5.4 x 10 -2 Count the places that the decimal point was moved to obtain this number. First express the numerical quantity between 1 and 10.Ģ. To express a number in scientific notation, do the following:ġ.
This is also called exponential notation. In scientific notation, all numbers are expressed as the product of a number (between 1 and 10) and a whole number power of 10. When n is a negative integer, the expression 10 n means “multiply 1/10 by itself n times”. When n is a positive integer, the expression 10 n means “multiply 10 by itself n times”. These rules apply to the use of exponents: Consequently, these numbers are expressed in scientific notation, using exponential numbers. The numbers that we deal with in the laboratory are often very large or very small.
0 kommentar(er)
