11/9/12
Three Types of Waves
(1)Mechanical waves - Waves which require a
material (medium) in which to move (propagate).
- Waves on a string (String instuments)
- Sound waves (Vi/ind instruments)
- Water waves
- Earthquake waves
(2) Electromagnetic Wave
Ch. 14 A certain transverse wave is described by
y(x,t) = 6.Ocmsin[0.027tx + 4.0111],
where x is in cm and t is in sec. Determine the waves (a) amplitude (b) wavelength (c)
equency (1) speed of propagatiOn and (e) direction of propagation. (i) What is the
3
CH. 13 A block whose mass is 680 1s fastened to a spring whose spring constant is 65
N/m. The block is pulled a distancedof 11 cm om its equilibrium position on a
frictionless surface and released from rest at t = 0. (a) What are the angular frequency,
10/21/14
Torgue II
Three ways 10 calculzlrc torque: CTOSS PrOdUCt I
T : : )F sin (b 2 Fun"
X ix perpendicular r0 ihc
plunc containing the \ecicxrx
Place ihc vecror: mil [0 mil.
The} dcl'inc :1 plane.
lever arm
Cross Product 2
Place the vectors mil to
Conservation of Energy
(an/r of #50! EA/EIEW
Are all
Conservation of Momentum
{fl/S Ofigrum
MIR"
Are
(9)5
Z Fextemal <
Collision Forces?
[01/101155 Mum Mi MMWM. 4)
Ch. 9 A lumberj ack (mass = 98 kg) is standing at rest on one end
. Kc
A - L I ' .f/j/(ln/ '7 [MI/$47, .
' ' V 4449M (41%,? rim/M
#9? 7W hm 47;er {Ma/g,
V: , V mh . ,
Problem 1 A car, initially going eastward,- rounds a 90° eurve' and ends up - '
' Eeaamgsouiwara. If the s 'ee ' ' ' ' t, what is the
difection of the car
Conservative vs.» Non- Conservat
(Dissipative) Forces I
(A)Conservative Forces
ive '
1) A force is conservative if a potential energy [Uf
can be associated with the force .
via the equation I
F(x) =_ dU/dx .(One Dim)
2) Total mechanical Energy is conserv
K
. .g. .i» V ;., ., .v. ~ 1 . a, a \3, w §§ \ x V wk?
3%, m \ a :34 . L 5 g a m §_ \ , ._ SK,» . w § Mw . \ «w w H m mm . \
«Marx Myra? \ w 9J1. iv MK Wk V xx msxh ¢ . (V A v w? A v Mm \ w W .§\ K + W \xm \imk w w? §\ W g \. W
«» .,. , n \ 4 z \N g g u§
wo blocks are connected, by Ver ligh 'String passing Over a
nasSless and frictionless pulley (Figure 6.30). Traveling at con:
gtantspeed, the 2O.OIN block moves 755.0.cvrn to the right and the;
12.0-N block moves 75.0 cm downWard'. During this process, ho
Equations and Constants (PhysZZl 1)
Kinematics, Newtons Laws
m
A'B=ABcosB |AXB|=ABsinB r=xi+yj+zk P=V
_ g a - a y
aZAt a:dt Vf=Vi+at
1 1 1
Xf= Xi + Vit + E at2 V2 2 Vi 2 +23(Xf - Xi) Xf = Xi + '2 (Vf + Vi) t xf: xi + Vft _ -2 at2
2 .
gxl 26 a
_ VO sm(
Newtons Lawsof Motion
Three laws that describe motionif 7, _ I ._ _ - . .
'(i) Speed? of theobject(s). are-not close tothe speed of light;
(ii) Dimensions of object('s) are not CIOSe to atomic dimensions. -
h These'laws "WOrk'in: inertial. ames (Frames w