Biology; Chemistry; Physics: Post your doubts here!

[taughtware]

urgent!!! which factors alter the time taken for a winged seed to fall down????

I would say height from which the seed is dropped and air resistance.

 

[Rizwan Javed]

I would say height from which the seed is dropped and air resistance.

And I would say mass/weight and surface area

 

[taughtware]

And I would say mass/weight and surface area

Thank you for pointing out that weight is also a factor. It is a factor because the seed is not falling on moon.

 

[Cutilixious Alizeh]

Salaam... i hv problem in chemistry can some1 suggest me a gud tutor in karachi. Some1 who iz best in chemistry.

 

[tdk]

Re: Biology,Chemistry & Physics Help Available Here !


Never Change the Formula! Only Valencies are cross multiplyed so the formula will be as Ghalya stated !!

Potassium sulfate is K2SO4
If you have any Chemistry question, plz ask me.

 

[tdk]

Salaam... i hv problem in chemistry can some1 suggest me a gud tutor in karachi. Some1 who iz best in chemistry.

If you want to study over Skype, I can suggest u a good teacher from Bangladesh. Thank you.

 

[Cutilixious Alizeh]

If you want to study over Skype, I can suggest u a good teacher from Bangladesh. Thank you.

No thx u
I don't want on skype the net is very bad here plus I want live teaching so its more convinent to ask and learn.

 

[NIM]

Guyzz need urgent help!!
The Figure shows two charged particles fixed in place on an axis. (a) Where on the axis (other than at an infinite distance) is there a point at which their net electric field is zero: between the charges, to their left or to their right? (b) Is there a point of zero net electric field anywhere off the axis (other than at an infinite distance)
______+q________-3q____

 

[Dashing Cancerian]

Guyzz need urgent help!!
The Figure shows two charged particles fixed in place on an axis. (a) Where on the axis (other than at an infinite distance) is there a point at which their net electric field is zero: between the charges, to their left or to their right? (b) Is there a point of zero net electric field anywhere off the axis (other than at an infinite distance)
______+q________-3q____

Do you still need answer for this?

 

[abbas haider]

CAn anyone explain Q 11 ...

 

[Dashing Cancerian]

CAn anyone explain Q 11 ...

The answer is D.
It is because the work done he puts to go forward is actually equal to the work he does against the resisting forces. As he is moving at a constant speed the work done is actually equal. So the heat lost is the work he is doing to move forward.

 

[Mendis P Kavinda]

Hi could anyone help me with this one???
5054/21/O/N/14

 

[Dashing Cancerian]

View attachment 57694
Hi could anyone help me with this one???
5054/21/O/N/14

Take the weights of measuring cylinder and the initial block of wood as zero because these two balance each other that will make the calculation simple and actually will have a solution.
Now,
0.39 x (40/100) = W x (30/100)
solve for W and you will have the weight asked.
For the next part W=mg
You got the W in the part before g is 10 N/Kg solve and you will get the mass.

I hope you get it

 

[Mendis P Kavinda]

Take the weights of measuring cylinder and the initial block of wood as zero because these two balance each other that will make the calculation simple and actually will have a solution.
Now,
0.39 x (40/100) = W x (30/100)
solve for W and you will have the weight asked.
For the next part W=mg
You got the W in the part before g is 10 N/Kg solve and you will get the mass.

I hope you get it

But if you initially take moments before placing the weight and liquid in the measuring cylinder,you see that the mass of the measuring cylinder is not equal to the mass of the wood...

 

[Dashing Cancerian]

But if you initially take moments before placing the weight and liquid in the measuring cylinder,you see that the mass of the measuring cylinder is not equal to the mass of the wood...

The mass doesn't matter when the scale is balanced. the torque is zero the anticlockwise moment is equal to the clockwise moment so mass isn't of concern anymore when the scale is balanced.

 

[Mendis P Kavinda]

The mass doesn't matter when the scale is balanced. the torque is zero the anticlockwise moment is equal to the clockwise moment so mass isn't of concern anymore when the scale is balanced.

Thank you very much....got it

 

[AbeehaH]

"details of kidney structure and nephron are not required); "Biology olevel syllabus
SO We don't study the details :the or cortex,renal pyramid, renal pelvis,ultrafiltration, glomrulus, osmoregulation,etc
Or should we do it to be in the safe side???

 

[AbeehaH]

"details of kidney structure and nephron are not required); "Biology olevel syllabus
SO We don't study the details :the or cortex,renal pyramid, renal pelvis,ultrafiltration, glomrulus, osmoregulation,etc
Or should we do it to be in the safe side???

 

[Dashing Cancerian]

"details of kidney structure and nephron are not required); "Biology olevel syllabus
SO We don't study the details :the or cortex,renal pyramid, renal pelvis,ultrafiltration, glomrulus, osmoregulation,etc
Or should we do it to be in the safe side???

Structure isnt required doesnt mean you dont have to study about the process of ultrafiltration and rest.
And yes on the safe side the structure should be studied.

 

[AbeehaH]

Thanks