September 6th
Why science?
Question claims, demand evidence.
Lighting and crime
Starting chapter 2
Covering sections 2, 3, 4, 8, and perhaps 6, plus Appendix 1
Measurement
We have to be specific in science. Can't just propose hypotheses like:
Units
Must have standard units to really quantify things. Length and time vs. taste
Length, time, temperature
Volume
Mass
Density
Kilo, mega, giga
Centi, milli, micro, nano
(Questioning the author: p. 43, Self-Check 2.4)
Uncertainty in measurement
8.3 8.34 8.338
Why science?
Question claims, demand evidence.
Lighting and crime
Starting chapter 2
Covering sections 2, 3, 4, 8, and perhaps 6, plus Appendix 1
Measurement
We have to be specific in science. Can't just propose hypotheses like:
- When we do something, um, something else happens
- Lighting up the dark reduces crime
- Assigning homework to students improves their academic success
Units
Must have standard units to really quantify things. Length and time vs. taste
Length, time, temperature
Volume
Mass
Density
Kilo, mega, giga
Centi, milli, micro, nano
(Questioning the author: p. 43, Self-Check 2.4)
Uncertainty in measurement
8.3 8.34 8.338
Significant figures
See Appendix 1
Generally, all non-zero digits given are certain except for the last
- 79
- 42.8
- 51.939
Zeros can be a problem:
- 0.00250
- 540.0
- 980.
- 3140000
Calculations: For example, 592 / 63 = 9.3968255968 ?
Scientific notation
Eliminates the problem of trailing zeros on positive numbers
(continuing on Monday)