# 20.7 Nerve conduction–electrocardiograms  (Page 5/8)

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nerve conduction

the transport of electrical signals by nerve cells

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what is a wave
A wave is a disturbance that carry energy from one place to another.
what is the importance of electric and magnetic field in mass spectrograph ?
you can determine the specific charge of a particle from the radius of gyration (Lamar radius) in the magnetic field.
Sean
furthermore the electric field accelerates the charges, so you can determine the kinetic energy etc
Sean
what is motion
a motion is the change in position of an object copmaring to a fixed point
ahmed
comparing*
ahmed
moving or move from one place to another place
Boomi
motion is the movement of an object from one place to another
David
Motion is the continues movement of an object from one fixed point to another with respect to time.
LAHBAN
what is acceleration: this is when the rate of an object changes in respect to it surrounding with time.
Turay
acceleration is change in velocity over time
mohammed
motion doesn't necessarily need to include a change in acceleration: motion is a change in position.
Julia
change in position
Azeem
Motion is the change of position from one point in a space to other point in the same space.. sorry for my english I'm francophone...
André-Franck
motion isn't really a scientific word so much. it just means literally how an object moves. İf you want to describe the motion of an object, to give a full picture you need to tell me what an object is at any moment of time I ask. From there, I can deduce anything I want: velocity, acceleration
Sean
Please keep in mind that it's not allowed to promote any social groups (whatsapp, facebook, etc...), exchange phone numbers, email addresses or ask for personal information on our platform.
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
it is an arrow on a map that can't be rotated or stretched, but it can be moved around. İf I place the tail of it on where you started a journey, the pointy end must lie EXACTLY on where you finished your journey.
Sean
what is gravity
no one really knows
Sean
how much do you need to know? what are you studying about it?
Sean
humans like to always point to a cause of something. İn fact, we have a phrase in English: "Everything happens for a reason". So, we have noticed ever since we have been alive that any object that had ever existed seems to be pulled by some "invisible hand" towards the earth.
Sean
And also the moon and earth "pull on eachother"...
Sean
Newton came up with this breakthrough that the type of pull between the moon and the earth is the same type of pull between the famous apple and the earth, and that this phenomenon is EVERYWHERE- universal!
Sean
and amazingly, we can actually predict exactly how this "hand" will pull on things.
Sean
Many many years later, Einstein came along and thought of gravity not like some invisible hand but more like something that is part of space and time itself... General relativity!
Sean
is the acceleration ever in the same direction as a component of velocity
what do you mean?
Sean
explain what "component" means to me
Sean
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
there isn't enough information to get a single number for p and q. also, you didn't give information about what p was doing. did you mean particle p instead of f?
Sean
this is like saying two people sit on a seesaw and the seesaw remains horizontal, what are their masses?
Sean
the idea is that assuming when you leave the system alone nothing falls, the weight of q plus weight of r must equal weight of p
Sean
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
the hall effect is used to measure a magnetic field strength
Sean
This is to do with the fact that current responds to a magnetic field. the charges start turning and end up on one side of the wire. this seperation of charge then ends up causing something you can actually measure, called a potential difference, (or equivalently) a voltage.
Sean
@sharan that is not correct. speed of charges is current. speed of current is... current, as when you say speed of current you are saying "speed of speed of charges". Voltage is how much energy is transferred to one unit of charge (the unit being Coloumb in Sİ units)
Sean
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
centre of mass is a point. it doesn't physically exist, but it is useful to make it up as it means that you don't have to worry about the individual atoms in, say, a rod.
Sean
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
if you want to be techincal, zero is incorrect... it is "the zero vector" but for most purposes you can say zero... it is like a shorthand
Sean
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
and to add to what has been said, air is a fluid! water is a fluid! But, we don't say that a wall is a fluid, or a bridge.
Sean
Father of science is who?
Galileo
PzUn
it is flawed to think there is a single father/mother of science
Sean
a particular branch of science maybe has that answer defined
Sean
but even then...
Sean
Are you just curious or did your teachers/ professor asked you this in an essay?
Sean
or are you curious about what people think?
Sean
also depends on the era. certain scientists had theories and hypothesis that were close but incorrect.
Luke
i.e astronomy. thinking the universe revolved around the Earth
Luke
why doesn't the initial position of the teacher or professor always start from zero ?
tell me if this doesn't answer your question, but the reason why the initial position of the professor doesn't always start from zero because no one cares what point you call "the zero mark". You can measure the length of your pencil starting from the 10 cm mark and then subtract 10 cm off
Sean