Name 7 S.I base units and their symbols?
length- m mass - kg time- s electric current- A temperature- K amount of substance - mol luminous intensity- cd
Rule of rounding off in calculations?
never round off until end
Name all scientific notation figures?
giga 10 9 G mega 106 M kilo 103 k deci 10-1 d centi 10-2 c milli 10-3 m micro 10-6 mu nano 10-9 n pico 10-12 p
How to find d and e?
d- how many places decimal must go to make number between 0 and 10
e- how many places after decimal comma
if e is bigger or smaller than 0?
bigger- move to right
smaller - move to left
What are significant figures?
non zero numbers
- besides zeros in between non zero
- only 0 if non zero number at end of decimal part
from km.h -1 to m.s -1?
/3.6
celcius to Kelvin?
+273
what is rate
change per time unit
directly proportional? (4)
- Increase in one variable leads to increase in other variable with same factor
- straight line graph through origin
- y=kx
- straight line not thru origin- linear relationship- variable increase/ decrease together
inversely proportional? (2)
- Value change leads to opposite change in other value
- Curve never cuts thru axis
Accuracy VS precision
aCcurate is how Close to real value
pRecision is Repeatable (consistent)
Variables?
Independent- manipulated by investigator
dependent- Measurable results of independent variable changing
Fixed- Variables kept constant
