This is not the lesson - only supplemental websites.

1. Significant Digits - L2-A
 Refer to the worksheet on significant digits (from the
workbook) that was done in-class.
See Section A6.2 (page 650) for some of the Sig Dig
rules that were covered in-class.
 See Videos:See Videos:
 Do not use a bar over numbers or a decimal at the endDo not use a bar over numbers or a decimal at the end
(as in the first video)(as in the first video)
http://www.youtube.com/watch?v=ZuVPkBb-z2Ihttp://www.youtube.com/watch?v=ZuVPkBb-z2I
http://www.youtube.com/watch?v=qrpq4qU6Wgghttp://www.youtube.com/watch?v=qrpq4qU6Wgg
Physics rap done by a studentPhysics rap done by a student
http://www.youtube.com/watch?v=iGZXhUeLh90http://www.youtube.com/watch?v=iGZXhUeLh90

2. Unit Conversion – L2 - B
By example (refer to page 3A from WB)(refer to page 3A from WB)
Question: 1i) 40 mg/mm1i) 40 mg/mm33
? kg/m? kg/m33
Ans: 40 mg/mm3
x (10x (10-3-3
g/mg) x (1kg/10g/mg) x (1kg/1033
g) xg) x (10(1033
mm/m)mm/m)33
= 40 x 10= 40 x 10-3-3
/ 10/ 1033
x (10x (1033
))33
= 40 x 1010-6-6
x 10x 1099
= 40 x 101033
= 4 x 104
kg/m3
or 4.0 x 104
kg/m3
Although the answer did fall into the ambiguous case,
it still must be expressed in proper scientific
notation. On a quiz/test, marks would be deducted
if not expressed correctly.

3. Practice Questions
 WB Page 3 #1,2,3,5, (all parts)WB Page 3 #1,2,3,5, (all parts)
 WB Page 3A – Try all partsWB Page 3A – Try all parts
 Your teacher may give additionalYour teacher may give additional
questions.questions.