PHYSICS 5B Study Guide - Fall 2018, Comprehensive Midterm Notes - Family Kx, Sine, Ox
PHYSICS 5B
MIDTERM EXAM
STUDY GUIDE
Fall 2018
Review of Energy and Energy Transfer (Ch 10)
*form of energy .
-K =kinetic energy
I
m(k = Imv ')
-U= Potential Energy
↳Ug =gravitational
:
/(ug= mgh)
.
1/11/11
↳Us = elastic In
spring
energy
R1
mmmm Us ,I kx
:
:.
:
www.nmD
it xt
.
-Ein = Thermal energy
Ednem = chemical energy
-For a system:
Total energy
: E = Kt Ut Etn + Fchem
-Energy transfer from one kind to another within a system
Ksystem
ut
'
I
.
\ttn In this case :energy is Conserved
,
oE=o
.
EI : Drop a 1kg ball to the ground .
ugh
,,
,kETh ¥11.Fi=¥
£m/v2
=
mgh
✓ =
Tngh = 2.9k = 4.4 mls
*Energy transfer between a system and Its environment through work Orland heat
.
environment
system
*work = mechanical energy by pushing or pulling
→→ →F1
W.
-F. d→d1 o
,
E± : Pull a box by IN force at 450 for a distance of lm
,F
÷
' W = 1. 1cos G = I. 1 cos 45 = 0.7 J
IM
.
Work -Energy Theorem : OE = N
↳Ef -E;= W
II
-
oE= F.
d
h
t#so
.
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system
Ky,system
Iuisolated system : oE=o oE=w
environment
e± :i. How much work is done to push a 1kg block up a 2m high ramp that make a 30 angle with the horizontal
,with a constant
speed
of 2 Mls
2.How
.
much force is required to push the block up ?
..
it
f.
XZM
)30 1
known :h=2m ,0=300
,v. .2m/s ,
Mt 1kg
1) W = OE =E
.,
-Ei =#
+
mgh -
#-o)= mgh
W.
-mgh = 1×9.8×2 .
-19 . 6 J
F
2)
mgs.no/
'
mgdsjt.mg
F- mgcos a = constant v = 0
=
.
x 9.8 cos 0 = 4.9 N
Checks
;D
.
.
¥know that ¥= sino
W.
-Fd = tshno t 4.9 (0¥ )= 19.6 J
-Conservative force : does not matter what path is taken .
Thermodynamics :(
Ch 11 &12)
-State of matter :Can be categorized in 4category
(1) solid .(2) liquid ,(3) gas ,(4) plasmid
-Thermodynamics : thermal properties of matter
4Remember E=K tUt Eh +
Ecnemt
...
..
-
temperature
: a basic physical quantity
•Temperature scales
.
(1) Celsius = To = E
.
.
-
Calibration
: ice -water (melting or freezing point )=0°C
water .
yapor
(boiling point )=100°C
(2) Kelvin =
T
-
.
K
-absolute scale ,proportional to
The internal energy
T= Tc + 273.15
Ok =-273.15°C = Zero energy
(3) Fahrenheit =T
,=
=OF
-common scale
Tp =¥It 32°F
Freezing point of water 0°C =32°F
obj . A Obj . B
..
T,Tz
Isolated System
T,z
in equilibrium
-T is related To the thermal energy of a system
↳Consider an Ideal gas system : a system of non -interacting gas of atoms or molecules
iii.
in
-Thermal energy of The system : Eth -Total Kinetic Energy of the atoms
N =Karg
Kong = average Kinetic Energy per atom = 31212,51
k,
= 1. 38×10-23
51k =
Bolts
Mann 's constant
Etn '
'ZNKBT :0Temp = no Thermal . 0 Kelvin .
-0 energy .
They
are proportional .
.
.
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Document Summary
Energy transfer from one kind to another within a system. Orland heat environment system work mechanical energy by pushing. I y , u isolated system : oe=o system oe=w environment e i. How much work is done to push a. 30 angle with the horizontal with a constant of. How much force is required to push the block up f. Conservative force : does not matter what path is taken . 4 category (1) solid . (2) liquid , (3) gas , (4) plasmid. Calibration ( melting water ice freezing point ) T ( boiling proportional energy point ) scale. Ideal gas system : a system of non interacting gas of atoms or molecules iii. in. Conservation of energy in mechanics oe= okt on. C ? are removed from energy consists beth. Transfer from one kind to another e use electricity to light a light bulb. Efficiency : e whaty. cn# what you had to pay.
