Chapter 2 Flashcards
What is a dimension?
a property that can be measured, such as length, time, mass, or temperature, or calculated by multiplying or dividing other dimensions, such as length/time (velocity).
What are the base units?
mass, length, time, temperature, electrical current, and light intensity
What is the definition of weight?
weight of an object is the force exerted on the object by gravitational attraction.
formula: W=mg
What is the rule for determining how many significant figures there are?
- the digits from the first nonzero digit on the left to
a. the last digit (zero or nonzer) on the right if there is a decimal point
b. the last digit of the number if there is no decimal point
What is the sig fig rule for multiplication/division?
number of sig figs should equal the lowest number of sig figs of any multiple/divides number
What is the sig fig rule for adding and subtracting?
sig figs are relative to the decimal point
- the one with the left most significant figures is the determining factor
What is back substitution?
substitute your solution back into the equation and see if it works
What is order of magnitude estimation?
reason of possible guess and ensure actual answer matches it
What is the resonableness test?
verifying the solution that makes sense
What is dimensional homegeneity?
all the additive terms on both sides of the equation must have the same dimensions
What is interpolation?
estimating a value of y for a value of x between tabulated points
What is extrapolation?
estimating data from outside the range of table data
