Physics: Post your doubts here!

[princeali97]

it does more the temperature more the pressure
what is pressure?continuous physical force exerted on or against an object by something in contact with it.
when you increase Kinetic energy more molecules start exerting force on the walls of a container hence higher pressure

Exactly!

 

[ZaqZainab]

Ahhh!.....im confused.As far as i know temperature does affect the pressure because as temperature increases the vibration and movement of molecules increases and so the frequency of collisions and the force they exert increases.

yes but why does the temperature change?
You aren't getting what i am saying
let me take an example i switched on the AC because it was hot
this doesn't mean It became hot when i switched on the AC
do you get it?
the reason there is low pressure is not because of low temperature
the reason there is low temperature is because of the low pressure
and so the reason there is low pressure is because of less air (weight) as i explained before

 

[princeali97]

yes but why does the temperature change?
You aren't getting what i am saying
let me take an example i switched on the AC because it was hot
this doesn't mean It became hot when i switched on the AC
do you get it?
the reason there is low pressure is not because of low temperature
the reason there is low temperature is because of the low pressure
and so the reason there is low pressure is because of less air (weight) as i explained before

Okay i get it.But how can low pressure cause a low temperature at the top of the mountain? that can also be a good question

 

[ZaqZainab]

Okay i get it.But how can low pressure cause a low temperature at the top of the mountain? that can also be a good question

yeah it can be

do yo want me answer this?

 

[kitkat <3 :P]

Exactly!is a mountan/quote]
Lets take example of two cities quetta and karachi quetta Is a valley and has mountains mountains have hieght and something which has height less air would be there above it so less pressure hence quetta is cold
if we take example of karachi its at sea level means not at hieght which means more air above the area that means pressure will automaticall increase because of more air henxe temp will increase

 

[princeali97]

yeah it can be

do yo want me answer this?

ofcourse!

 

[princeali97]

great! good example! I wish Karachi had some mountains

 

[ZaqZainab]

ofcourse!

lol i though you got it

it does more the temperature more the pressure
what is pressure?continuous physical force exerted on or against an object by something in contact with it.
when you increase Kinetic energy more molecules start exerting force on the walls of a container hence higher pressure

the same this but this case
when you decrease pressure the kinetic energy of a molecule becomes less and so less molecules exert that much force and so temperature decreases

 

[princeali97]

i got it i got it i got it!!!...phew! thanks zainab..thank u very much

 

[ZaqZainab]

i got it i got it i got it!!!...phew! thanks zainab..thank u very much

where did you get this question from or was it just a random one?

 

[princeali97]

where did you get this question from or was it just a random one?

it was a past paper question.I don't remember the year.It was in between year s05 and w13. keep searching

 

[ZaqZainab]

it was a past paper question.I don't remember the year.It was in between year s05 and w13. keep searching

lol maybe i will come across it some time

 

[princeali97]

lol maybe i will come across it some time

Pls do share questions that u find confusing.It will really help us.

 

[ZaqZainab]

Pls do share questions that u find confusing.It will really help us.

I will

 

[Snowysangel]

Will try replying one at a time.

1) Newtons's first law of inertia states that an object will continue moving in the same direction and speed unless acted upon by an unbalanced force.. So when an object is in motion initially gradually slows down due to some unbalanced force acting on it. However, it is important to know that momentum is always conserved when there's no external or unbalanced force acting on the object. In this case, the object slows down due to an opposing external force such as friction force.

How is friction an external force when the floor or the road or whatever is creating it?

 

[princeali97]

How is friction an external force when the floor or the road or whatever is creating it?

An external force is a force between a part of a system and something outside the system while external forces include the applied force, normal force, tension force, friction force, and air resistance force. When two parts of a system exert forces on each other, those forces are said to be internal forces for the system.

 

[Snowysangel]

An external force is a force between a part of a system and something outside the system while external forces include the applied force, normal force, tension force, friction force, and air resistance force. When two parts of a system exert forces on each other, those forces are said to be internal forces for the system.

Oh so if the object is moving through air, air resistance slows it down, and since air wasnt involved in the original collision, it's not part if the system and created an external force? Ok got it thanks

 

[chocolate_girl]

View attachment 40175

Didnt u mention opposite headings of series nd parallel?

 

[Thought blocker]

Doubt in Waves. Can someone explain it to me ?
(Chapter 14,15,16) <--- Coursebook.
mehria
Suchal Riaz
Rutzaba
midha.ch
usama321
ZaqZainab

 

[mehria]

Doubt in Waves. Can someone explain it to me ?
(Chapter 14,15,16) <--- Coursebook.
mehria
Suchal Riaz
Rutzaba
midha.ch
usama321
ZaqZainab

i dnt use coursebook