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Read 1 note: Applied natural sciences (3NBB0) University Physics with Modern Physics, Global Edition, ISBN: 9781292314730 £2.56   Add to cart

Lecture notes

Read 1 note: Applied natural sciences (3NBB0) University Physics with Modern Physics, Global Edition, ISBN: 9781292314730

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This document consists of the content of the first lecture of applied natural sciences for the mechanical engineering program.

Last document update: 3 year ago

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  • November 23, 2021
  • November 23, 2021
  • 4
  • 2021/2022
  • Lecture notes
  • Andre duif
  • College 1
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UUINVHTTSS, 1*111*1EEMYAATT118$ AANXIDD DDYIINVAAMY118$
units physical quantities . and vectors
Fundamental physical quantities
Mass (Kg ) :

past definition : 1 kg =
mass of one dm ' water at 4 degrees

current definition : 1kg =
mass of a piece of Pt lr
-


alloy in Paris ( since 1901 )

time ( s )

past definition : a certain part of the mean solar day
current definition : 1s =
duration of 9192632770 periods of the radiation corresponding to the transition

between two hyperfine levees of the ground state Ce 133

length (m ) :




past definition : length of a certain bar in Paris

current definition : 1m =
distance light travels in vacuum in 11299792458 s




uncertainty & significant figures
ma
"


absolute uncertainty : when there are multiple trials /measurements
reading uncertainty :
based on the measuring instrument

absolute uncertainties (A) have a unit
Abs . Unc .




relative uncertainty measurement :




relative uncertainty comes in the form of fractional relative uncertainties and percentage
relative uncertainties .




significant figures the amount of digits ( I 9) as well as leading zeros after a decimal point and
-

:




ending zeros

mathematical operations :




multiplication and division :




significant figures : not more significant figures than the fewest significant figures
uncertainty : add relative uncertainties
addition and subtraction :




significant figures fewest digits to : the right of the decimal point .




uncertainty : add absolute uncertainty



scalar and vector quantities

scalar :
single number with a unit ( no direction) vector : magnitude and direction

examples :
examples :




1. Temperature i. displacement
2. Time 2 . Velocity
3. mass 3 .
acceleration

4. Volume 4 .
force
5. speed 5 . electric field

6. density a. magnetic field

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