Lecture 2

Question 1

produces a number and describes a property in terms of how much

Answer 1

quantitative

Question 2

made using only the senses and is expressed using words rather than numbers

Answer 2

qualitative

Question 3

tells the amount of the quantity measured

Answer 3

number

Question 4

tells the type of quantity measured

Answer 4

unit

Question 5

the measure of how closely individual measurements agree with each other

Answer 5

precision

Question 6

how close the individual measurement are to the true value

Answer 6

accuracy

Question 7

______ ________ don’t have uncertanties

Answer 7

exact numbers

Question 8

4 steps to dimensional analysis

Answer 8

1. identify the known and desired quantities
2. write down known quantity - leave some working space by drawing a horizontal line - and set known quantity equal to units of the desired quantity
3. determine the conversion factor for the equation
4. carry out the necessary arithmetic to solve the problem

(known amt.) x conversion factor (desired units/known units) = desired units

Question 9

ratio that shows how one unit of measure is related to another unit of measure

Answer 9

conversion factor (ex. 1 hr = 60 min)

1hr/1hr = 60min/1hr……..or 60min/1hr

Question 10

3 rules for zeroes being significant figures

Answer 10

1. sandwiched between numbers (109)
2. trailing zeroes in decimal place (0.03400)
3. trailing zeroes with decimal point following (180 or 1.80)