its the study of all natural phenomenon ranging from the macroscopic scale (i.e. galaxies, stars, planets) to the microscopic scale(i.e. atoms, & elemantary particles)

(a)  

fundamental of all branches of science, & the foundation of all engineering & technology

(a)  

its an experimental science,

-well established/widely used theory= physical laws or principles

(a)  

any number that is used to describe a physical phenomenon quantitatively. it is defined by specifying how it is measured, or how it is calculated from other quantities.

(a)  

T= 273.15K

what is the "T" description?

(a)  

T= 273.15K

what is the "273.15" description?

(a)  

T= 273.15K

what is the "K" description?

(a)  

(a)   physical quantities are quantities that are defined in terms of the fundamental quantities.

SCIENTIFIC NOTATION steps:

#1: Identify the original (a)   of the decimal point.

SCIENTIFIC NOTATION steps:

#2: If the number is greater than one, move the decimal point to the left & place it before the leftmost (a)   digit.

SCIENTIFIC NOTATION steps:

#3: If the number is less than one, move the decimal point to the (a)   , & place it after the first nonzero digit.

SCIENTIFIC NOTATION steps:

#4: find the exponent by determining the (a)   of places from its original position. The sign of the exponent Is positive if the places are converted off to the left, & negative if the places are converted off to the right.

find the scientific notation:

65,000,000

(a)  

find the scientific notation:

0.0000055

(a)  

it is range in which the actual value of a measured quantity lies within. It depends on several factors such as:

(a)  

UNCERTAINTY is range in which the actual value of a measured quantity lies within. It depends on several factors such as:

(1.) (a)   of the measuring device

UNCERTAINTY is range in which the actual value of a measured quantity lies within. It depends on several factors such as:

(1.) limitation of the measuring device

(2.) (a)   of the experimenter

UNCERTAINTY is range in which the actual value of a measured quantity lies within. It depends on several factors such as:

(1.) limitation of the measuring device

(2.) skill of the experimenter

(3.) (a)   of the object being measured

UNCERTAINTY is range in which the actual value of a measured quantity lies within. It depends on several factors such as:

(1.) limitation of the measuring device

(2.) skill of the experimenter

(3.) Irregularities of the object being measured

(4.) (a)   factors

its the closeness of a measured value of a quantity to the true value of that quantity

(a)  

closeness of the several measured values from one another

(a)  

with different rulers, the ruler below gives a more precise value of length than the ruler above. thus, the ruler below has a (a)   uncertainty than the ruler above.

since;

(the measured value of length using the ruler above is)

4.4cm {the 4 in the left before the decimal is the exact value; while the 4 after the decimal is the estimated value.}

(the measured value of length using the ruler below is)

4.42cm [4.4 is the exact value, while the 0.02 is the estimated value]

its a meaningful digits in a measured value. These digits include the certain or exact ones & the estimated digit.

ex: 4.4cm(4.=exact; 0.4=estimate) {2 sigfigs}

4.42cm(4.4=exact; 0.02=estimate) {3 sigfigs}

(a)  

SIGNIFICANT FIGURES RULES:

Rule 1: All nonzero digits in a measured number are (a)   .

Ex:

~3.1416 = 5 sigfigs

~175 = 3 sigfigs

~24 = 2 sigfigs

SIGNIFICANT FIGURES RULES:

Rule 2: All zeros between (a)   digits are significant.

Ex:

~3.04 = 3 sigfigs

~1011 = 4 sigfigs

~20054 = 5 sigfigs

SIGNIFICANT FIGURES RULES:

Rule 3: Zeros to the left of the first nonzero digit serve only to (a)   the position of the decimal point and are not significant.

ex:

~0.04 = 1 sigfigs

~0.000054 = 2 sigfigs

SIGNIFICANT FIGURES RULES:

Rule 4: In a number with digits to the (a)   of a decimal point, zeros to the right of the last nonzero digit are significant.

ex:

~43.0 = 3 sigfigs

~43.0000 = 6 sigfigs

~0.00200 = 3 sigfigs

~0.40050 = 5 sigfigs

SIGNIFICANT FIGURES RULES:

Rule 5: If a number has no decimal point and ends in one or more zeros(e.g. 400), the (a)   that end the number may or may not be significant. The actual number of significant figures can be obtained by knowing how this number is measured.

ex: 400= 1,2,3 sigfigs(depending on the precision of the measuring instrument used to determine this number)

SIGNIFICANT FIGURES RULES:

Rule 5:

(a)   can be avoided by writing the number in scientific notation. If all zeros are significant, put a decimal place after the last significant zero digit.

ex:

~if the number 400 has 3 sigfigs, we can write it as either 400 or 4.00x10^2.

~if the number 400 has only 1 sigfigs, we can write it as 4x10^2.

SIGNIFICANT FIGURES RULES in OPERATIONS OF NUMBERS:

Addition&Subtraction: the sum or difference should (a)   have digits beyond the last digit position common to all numbers added or subtracted.

ex:

~34.6+17.8=52.4

~20.6+17.825=38.425~~38.4

SIGNIFICANT FIGURES RULES in OPERATIONS OF NUMBERS:

Multiplication&Division- the product or quotient should have number of significant figures equal to the number with the (a)   significant figures.

ex:

8.536*0.47=4.01192~~4.0

384/285.3=1.34595163~~1.35

ROUNDING-OFF NUMBERS RULES:

Rule 1: If the first digit to be dropped is less than five, that digit and all the digits that follow it should be (a)   .

ex: 54.234=54.2 (rounded off to 3 sigfigs)

987.354=987. (rounded off to 3 sigfigs)

ROUNDING-OFF NUMBERS RULES:

Rule 2: If the first digit to be dropped is a digit greater than 5, or if it is a 5 followed by digits other than zero, the excess digits are all dropped and the last retained digit is (a)   by one unit.

ex: 54.254=54.3 (rounded off to 3 sigfigs)

98.6=99. (rounded off to 2 sigfigs)

ROUNDING-OFF NUMBERS RULES:

Rule 3(Odd-Even rule): If the first digit to be dropped is 5 and it is (a)   followed by any number , or if it is a 5 followed by zeros, the odd-even rule of rounding off is applied.

~if the last retained digit is even, then its value must be retained.

~if the last digit retained is odd, then its value must be increased by one.

ex:

54.250000=54.2 (3 sigfigs)

57.75=57.8 (3 sigfigs)

DIMENSIONAL ANALYSIS

it denotes the nature of a physical quantity

(a)  

its a method used to determine if an equation is dimensionally correct or consistent.

(a)  

an equation is (a)   if both sides of the equation have the same dimension.

-terms to be added, subtracted, or equated must have the same dimension.

-for a product of two quantities, the dimension of another. The resulting dimension is the dimension of the product.