Homework Help: chemistry

Posted by bun on Monday, January 18, 2010 at 4:23pm.

6.2(+_ 0.2) - 4.1 (+_ 0.1 ) + ?

[6.2( +_ 0.2) - 4.1(+_ 0.1)] : 9.43(+_0.05)

find absolut uncertainty and relative uncertainty.

PLEASE HELP:I solved them and got the exact absolute uncertainty like the answer key, but I didn't get right answer of relative unsertainty, my answer for both case 9.5 %, but the answer key is 11% for both , why?

this is my solution :

for problem 1:
relative uncertainty = [sqr(0.2^2 + 0.1^2)/2.1] *100 am I wrong?

Please help, thank you in advance.

chemistry - bobpursley, Monday, January 18, 2010 at 5:52pm
You calculated wrong.

relatuncert= sqrt(.04+.01)/2.1=sqrt(.05)/2.1= .106 rouned to two sig figures will be 11 percent.

Answer this Question

Related Questions

CALCULUS - Find and Classify, the absolut extreme values of each function on the...
Chemistry - An atmospheric scientist interested in how NO is converted into NO2 ...
economic - Suppose that your firm was accused of illegally conspiring with other...
math - what formulas do i use for this: Investments Suppose $10,000 is invested ...
math - How do you find the definite integral of an absolute function? &#8747...
Math - The markup on a video camera should be 37 % based on selling price. If ...
Calculus - find all discontinunities and remove if possible: F(x)= 2x if x&...
math engineering - ) ∫_(-1)^2 ∫_0^6▒〖x...
chemistry - Hi, I really need help with my lab report because Im completely ...
calc - a) Suppose f(x) is defined on 0 ≤x≤1 by the following...

For Further Reading

First Name:
School Subject:
Answer: