Physics, Chemistry and Biology: Post your doubts here!

[sfhn_128]

here you go.....
PART(D)
the two masses we chose were 600g and 400g, both of them are acting downwards
first we convert these to newtons, but for that they must be in kg so 600g=0.6kg and 400g=0.4kg
we multiply both by 10 to get their weights (forces) 0.6kg=6N and 0.4kg=4N, so until now we have a total of 10N force acting downwards but we know that the disc also has a mass which is 200g=0.2kg=2N, therefore now the downward forces are equal to 12N,
Thus we know that 12N is the force acting on the pivot

there is no need to mention anything about upward forces = downward forces because the asked about force acting ON the pivot not force EXERTED by the pivot

Thanks alot!!!!........You r really good at physics!!

 

[sfhn_128]

there is no need to mention anything about upward forces = downward forces because the asked about force acting ON the pivot not force EXERTED by the pivot

If it says force exerted it means that the force is considered as upward force??

 

[Mustafa84922]

If it says force exerted it means that the force is considered as upward force??

if it said that then it was asking you about the force that the pivot is applying, sometimes it can also be downwards if the upwards forces on the object are more than those downwards the pivot will then apply a force downwards to keep the object in equilibrium thats why if you nail something in the wall and try to move it upwards (not rotating) it wont go becuase the pivot (nail) will just exert a force big enough to cancel out your force if you force is too much the pivot will break

 

[Mustafa84922]

Thanks alot!!!!........You r really good at physics!!

You're welcome and thanks for the compliment but i myself sometimes do get stuck on questions but then again those are the question even my teacher couldn't solve xD my sir says the mark scheme is wrong but i know its not

 

[sfhn_128]

if it said that then it was asking you about the force that the pivot is applying, sometimes it can also be downwards if the upwards forces on the object are more than those downwards the pivot will then apply a force downwards to keep the object in equilibrium thats why if you nail something in the wall and try to move it upwards (not rotating) it wont go becuase the pivot (nail) will just exert a force big enough to cancel out your force if you force is too much the pivot will break

Thanks again !

 

[sfhn_128]

You're welcome and thanks for the compliment but i myself sometimes do get stuck on questions but then again those are the question even my teacher couldn't solve xD my sir says the mark scheme is wrong but i know its not

Hahaha.....Hilarious.!!

 

[Mustafa84922]

Hahaha.....Hilarious.!!

ikr....XD

 

[XxChampXx]

Hope you don't mind me answering.
But for the force in F=ma, you take the resultant force.
There is an upward force acting on the brick, 14.7N and a downward force weight, (3.09 * 10N= 30.9)
Resultant force is 16.2N
16.2/3.09 = 5.24ms^2

Thank you so much!!

 

[Ahmed Elsiddig]

I would love who ever solves this and explains it to me

 

[shingiechingz@8]

View attachment 53931 I would love who ever solves this and explains it to me

which paper is it ?

 

[Ahmed Elsiddig]

2014 ON 31

 

[Abdurrahmanmuhammed]

Magic!!!!
I went on the advanced search of adobe, typed in the ques and well I got the year and so the ms!

it is the march session paper ms hasnt released show me the ms then ???

 

[XxChampXx]

it is the march session paper ms hasnt released show me the ms then ???

From where do you get the March paper?

 

[Abdurrahmanmuhammed]

From where do you get the March paper?

I stay in india ,btw that question is also there in o/n 7
if you want the march papers wait till 6:30 GMT today

 

[shingiechingz@8]

goodluck in physics guys

 

[XxChampXx]

Can someone please explain capacitors?

 

[Israa Adam]

Basically , they are devices that are used to store charge (energy) in electric circuits .
they are used in delay circuits , eg rectification ( changing ac to dc) .

 

[Bah...]

So in a sound wave...
A compression is a region of high pressure and rarefaction a region of low pressure?
Or is it the other way round?

Ya it's correct. Compression is a region of high pressure and density. Rarefaction is the opposite.

 

[Tozu Fofo]

What's the difference between moments and momentum?
And when to use momentum, I know when to use moments
I also am confused because I thought they were the same but turns out each one have different equation.

 

[iThink LARGE]

Exam was easy Alhamdulillah!