Physics: Post your doubts here!

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How to sketch this velocity-time graph?

 

[Physicist]

How to sketch this velocity-time graph?

see question 1 at

9702 November 2011 Paper 22 Worked Solutions | A-Level Physics

Physics Reference - A-Level 9702, Past Exam Paper Solutions ..

physics-ref.blogspot.com

 

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Can anyone explain this?

 

[Mushraf altaf]

How to sketch this velocity-time graph?

some help with kinematics graphs
https://notesnsolutions.com/cie-a-level/cie-a-level-physics/cie-a-level-kinematics-as/

 

[KashishV]

Can anyone explain this?

I know it's quite late, but I hope the explanation helps nonetheless.
The spring is moving vertically up and down, with equilibrium point being in the centre. At "lowest point of its motion" the mass has MAXIMUM displacement downwards. And at maximum displacement, we know that potential energy is maximum and kinetic energy is minimum(=0) therefore velocity=0 at lowest point and answer is D

 

[muhammad afzal1970]

Any one can help in physics practical paper 32 may/ June 19
i dont get the value of x in question 1

 

[A*(a*)]

Is there any whatsapp group for this group and if yes can someone kindly add me over there

 

[A*(a*)]

Should I tell my number ?

 

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How to solve part b?

 

[KashishV]

How to solve part b?

Hi, firstly this is a physics forum and your question is chemistry-related. Please be mindful henceforth
As to your question, it's quite a memory based answer. You need to know that MgCl2 dissolves in water to give Mg(OH)2+HCl; Since one product is basic and the other is acidic, your best guess is pH 7.
in case of MgO, you need to know that it hardly dissolves/is slightly soluble. It is more of a surface reaction that occurs in which Mg(OH)2 is produced. As a result, you predict a high pH. Dont go till 14, Mg(OH)2 is not as strong of an alkali.

 

[asra_070]

pls help with this

 

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Hi, firstly this is a physics forum and your question is chemistry-related. Please be mindful henceforth
As to your question, it's quite a memory based answer. You need to know that MgCl2 dissolves in water to give Mg(OH)2+HCl; Since one product is basic and the other is acidic, your best guess is pH 7.
in case of MgO, you need to know that it hardly dissolves/is slightly soluble. It is more of a surface reaction that occurs in which Mg(OH)2 is produced. As a result, you predict a high pH. Dont go till 14, Mg(OH)2 is not as strong of an alkali.

Sorry. I didn't notice at that time and thanks.