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Mathematics: Post your doubts here!

syed1995

syed1995

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Rutzaba .. I am pretty sure what those peeps did is incorrect.

Since there are 14 seats in total.. and they disregarded that totally:\

imo the ways will be way more than what they have given in the answer.

Thanks for pointing it out.. I will be asking this from my sir on Monday.. guess i have a reason now to go to school on Monday:p
 
Obsidian Fl1ght

Obsidian Fl1ght

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Q.5 (ii)
How can we prove the highlighted section? I don't get it.
 

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Obsidian Fl1ght

Obsidian Fl1ght

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ahmed abdulla said:
any
explaination please ?its easy looking at mark scheme!!
Click to expand...
Equations formed are basically resolving of the forces. First ie 12*cos(80)= Q - P*cos(60) is resolving in the x axis.
Consider all forces and their individual components first.
In x axis:
For Q: It's Q.
For 12N (aka the Resultant) = 12cos(80) N
For P: Pcos(60) N
(60 = 180 - (80 + 40) )
In y axis:
For Q: ZERO - Nada - Zilch.
For 12N (aka the Resultant) = 12sin(80) N
For P: Psin(60) N
Now equate all of these.
Resultant = vector sum of force components
In x axis:
12cos(80) = Q - Pcos(60) (i)
Similarly, y axis:
12sin(80) = Pcos(60) (ii)
First find P from (ii).
Substitute it into (i)
Voila u get Q.
 
ahmed abdulla

ahmed abdulla

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Obsidian Fl1ght said:
Equations formed are basically resolving of the forces. First ie 12*cos(80)= Q - P*cos(60) is resolving in the x axis.
Consider all forces and their individual components first.
In x axis:
For Q: It's Q.
For 12N (aka the Resultant) = 12cos(80) N
For P: Pcos(60) N
(60 = 180 - (80 + 40) )
In y axis:
For Q: ZERO - Nada - Zilch.
For 12N (aka the Resultant) = 12sin(80) N
For P: Psin(60) N
Now equate all of these.
Resultant = vector sum of force components
In x axis:
12cos(80) = Q - Pcos(60) (i)
Similarly, y axis:
12sin(80) = Pcos(60) (ii)
First find P from (ii).
Substitute it into (i)
Voila u get Q.
Click to expand...
tanks bro
 
Pie-man

Pie-man

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