Mathematics: Post your doubts here!

[wahaajsid]

please solve Q10 of nov 11 p33... HELP NEEDED!
P.S thanks for the answer ffaadyy

 

[salman haider]

This is how you'll do q7.

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this was very helpful......im very thankful for your effort

 

[salman haider]

can anybody give me the link to download 'list of formulae(mf9) ?? please !

last few pages of syllabus contains mf9

 

[ffaadyy]

when a question says a particle is projected and doesnt mention any force.....i have to ignore the force too right?? and what about the initial velocity?? HELP!!

If it is projected vertically upwards and no other force is mentioned, then the only force acting would be the Gravitational Force which means that the Acceleration will be equal to -10 m/s^2. As far as the initial velocity is concerned, it'll either be mentioned that the object is projected vertically from rest or some initial velocity will already be given. There are a few ways through which you can find the initial velocity for example if the greatest height to which the particle has traveled is given or the total time taken is given. It all depends on the question.

 

[smartangel]

i need help with vectors..Distance of a point from a line! this question is from the CIE endorsed book and not frm the pastpapers!
Q) Find the distance of (3,4) from the straight line 3x+ 4y=0
the answer is 5.

 

[Esme]

is this vectors or coordinate geometry ??

 

[Esme]

last few pages of syllabus contains mf9

thank you.
this being given to us in the exam hall will make the ppr much easier !

 

[smartangel]

is this vectors or coordinate geometry ??

its vectors..comes under distance of a point frm a straight line..

 

[smzimran]

thank you.
this being given to us in the exam hall will make the ppr much easier !

It is given!

 

[anonymous123]

AoA wr wb
A box of mass 2kg is projected with speed 6 m/s up a line of greatest slope of a rough plane inclined at 30° to the horizontal. The coefficient of friction is 1/3.Use work energy principle to calculate the distance the box travels up the plane before coming to rest.

Another question i got is abt the work energy theorem formula...i have seen 2 versions of it
Final energy - Initial energy = Work done by engine - Work done by friction
and
Final energy - Initial energy = Work done by engine + Work done by friction

Which ones correct?? Help me plzz

 

[ffaadyy]

AoA wr wb
A box of mass 2kg is projected with speed 6 m/s up a line of greatest slope of a rough plane inclined at 30° to the horizontal. The coefficient of friction is 1/3.Use work energy principle to calculate the distance the box travels up the plane before coming to rest.

Another question i got is abt the work energy theorem formula...i have seen 2 versions of it
Final energy - Initial energy = Work done by engine - Work done by friction
and
Final energy - Initial energy = Work done by engine + Work done by friction

Which ones correct?? Help me plzz

What's the answer to this question?

 

[anonymous123]

What's the answer to this question?

I get 2.33m and in book its 2.76

before u strt attempting the question can u plz tell me the correct formula so i can solve more questns in the meanwhile

 

[ffaadyy]

AoA wr wb
A box of mass 2kg is projected with speed 6 m/s up a line of greatest slope of a rough plane inclined at 30° to the horizontal. The coefficient of friction is 1/3.Use work energy principle to calculate the distance the box travels up the plane before coming to rest.

Another question i got is abt the work energy theorem formula...i have seen 2 versions of it
Final energy - Initial energy = Work done by engine - Work done by friction
and
Final energy - Initial energy = Work done by engine + Work done by friction

Which ones correct?? Help me plzz

Final energy - Initial energy = Work done by engine - Work done by friction

This one is correct^.

Basically the formula is 'Work done by Engine - Work done by Force = Change in Mechanical Energy'.

 

[anonymous123]

Final energy - Initial energy = Work done by engine - Work done by friction

This one is correct^.

Basically the formula is 'Work done by Engine - Work done by Force = Change in Mechanical Energy'.

thxxx and wht answer did u get?

 

[unique840]

i need help with vectors..Distance of a point from a line! this question is from the CIE endorsed book and not frm the pastpapers!
Q) Find the distance of (3,4) from the straight line 3x+ 4y=0
the answer is 5.

A2 or As vectors?

 

[anonymous123]

ffadyy m w8ing

 

[MHHaider707]

Anyone tell me how to do m/j 11 p33 Q7 (iii)!!

Anyone tell me please!!

 

[ffaadyy]

thxxx and wht answer did u get?

I am getting 2.28m from two different methods which book is this question from?

 

[anonymous123]

M2 edexcel AS and A level modular mathematics.....btw why dont we round our answers to 2 sf to make it the same?

 

[Jaf]

i need help with vectors..Distance of a point from a line! this question is from the CIE endorsed book and not frm the pastpapers!
Q) Find the distance of (3,4) from the straight line 3x+ 4y=0
the answer is 5.

This is, in essence, an incorrect question to begin with (I think).
The distance of a point from a line is never constant. What can be asked is the distance of a point from another point on a line. You're probably missing some essential detail of the question. I could be wrong, but I'm pretty sure I'm not.