# 27.8 Polarization  (Page 12/19)

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• Card 12 / 19:
direction of polarization

the direction parallel to the electric field for EM waves

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what is motion
a motion is the change in position of an object copmaring to a fixed point
ahmed
comparing*
ahmed
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ok
Chelsea
ok
babar
can u explain the term displacement in another form
displacement is the change in position of an object
Owusu
this is the a average distance covered
Lekunga
change in position with respect to reference point
babar
resultant of position vectors or difference of position vectors of a moving object
babar
Distance with a directional component.
Emmanuel
displacement is the difference between your final and initial positions independent of the path taken. distance is how far you actually moved.
Julia
is the acceleration ever in the same direction as a component of velocity
what is gravity
Singut
A 12V battery has a 1ohm resistor in series with a parallel system of 3ohms and 6ohms. How much current is going through the 3ohm resistor?
Total circuit current, I=12/3=4 amperes this means that 8v will be across the parallel resistors. Current through the 3 ohms is 8/3 amperes
Barnabas
How do you know there is 8v across the parallel resistors?
Ingrid
good question
Lekunga
Lekunga
3//6 combined is 2 ohms. Total cct R is 3 ohms, I=V/R=4amps. V across 3//6 is therefore = I x R = 8 volts.
Peter
thanks
Lekunga
a particle f suspended by two strings passing over smooth pulley isattached to two other particles q and r .. calculate the masses of p and q if mass of r is 2 kg
what is hall effect and what are its applications?
It's under sound wave
for speed detection.i.e speed of current
Ben
speed of the current is nothing but voltage
sharan
a uniform rod of length 3m is suspended at one end about an axis perpendicular to its length and it has mass of 2kg and an inertial of 6kgm^2. if the uniform rod was initially at horizontal. calculate its angular velocity when it is at an angle of 30° to the horizontal? please show your workings?
The rotational kinetic energy will equal the gpe lost by the beam as its centre of mass falls 3sin(30)=1.5m. You should get 10^(1/2) for omega but check it on paper.
Richard
the answer you gave is actually incorrect! can you check for any mistake
Olalekan
The centre of mass is at the centre of the beam so will have fallen 0.75m so that will reduce the overall angular speed.
Richard
okay.... does it mean the centre of mass itself has its own particular height? please explain to me sir... am confused!
Olalekan
During a race on an oval track, a car travels at an average speed of 200km/hr. Determine its average velocity at the end of its third lap
it's average velocity is zero
babar
zero
babar
great
Olalekan
does it matter that the track is elliptical instead of circular?
Julia
"lap" just means that you end up where you started from
Sean
so it could be elliptical, triangular, square: in any shape you like!
Sean
absolutely right shape doesn't matter
babar
what is mean fluid
which is capable of changing its shape or something which is viscous in nature
Supremo
fluid is a substance which deforms and flows when we apply small shear force
Manohar
Father of science is who?
Galileo
PzUn
why doesn't the initial position of the teacher or professor always start from zero ?
I always come across question like that how can I defined Newton's law of cooling.....?
kirchoff laws says what
who is the father of Electricity
BROWN
William Gilbert
yusuf
Alessandro Volta
Vasile