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Mathematics corner
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Insurgent
#11 Posted : Tuesday, February 28, 2012 2:58:32 PM
Rank: User

Joined: 8/6/2010
Posts: 594
Instead of tribal politicals and enuendos, I chose maths.

6 X 5 - 10 + 66 =

I said that is impossible. Can someone help me on this one or my son will have it rough on the backside tomorrow.

I agreed 221 is the answer but no one has given me a tick on 1003? Njung'e, do you know mathematics?


"One man gives freely, yet gains even more; another withholds unduly, but comes to poverty. A generous man will prosper; he who refreshes others will himself be refreshed." Rev Canon Karanja.
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Njung'e
#12 Posted : Tuesday, February 28, 2012 3:05:12 PM
Rank: Elder

Joined: 2/7/2007
Posts: 11,935
Location: Nairobi
Insurgent wrote:
Instead of tribal politicals and enuendos, I chose maths.

6 X 5 - 10 + 66 =

I said that is impossible. Can someone help me on this one or my son will have it rough on the backside tomorrow.

I agreed 221 is the answer but no one has given me a tick on 1003? Njung'e, do you know mathematics?


Yep....Terrific in thermo-dynamicsApplause .Sasa hiyo ya kuuza mayai kwa soko is a waste of time.I want something that can make me chew my hat or remove the house paint with my nailssmile
Nothing great was ever achieved without enthusiasm.
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QW25091985
#13 Posted : Tuesday, February 28, 2012 3:24:58 PM
Rank: User

Joined: 1/24/2012
Posts: 1,675
Location: In Da Hood
Insurgent wrote:
Instead of tribal politicals and enuendos, I chose maths.

6 X 5 - 10 + 66 =

I said that is impossible. Can someone help me on this one or my son will have it rough on the backside tomorrow.

I agreed 221 is the answer but no one has given me a tick on 1003? Njung'e, do you know mathematics?


Wooooi ! . better ask a deaf person that question !
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dossy7
#14 Posted : Tuesday, February 28, 2012 3:31:34 PM
Rank: Elder

Joined: 12/9/2009
Posts: 1,493
Location: Nairobi
Find the probabilities for each, using the standard normal distribution.
i). Pr(z < 1.42)
ii). Pr(z > −1.39)
iii). Pr(−2.46 < z < 1.74)

Seems people want to do maths today,haya there you go
Kenya ni yetu sisi sote
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Tebes
#15 Posted : Tuesday, February 28, 2012 3:38:36 PM
Rank: Elder

Joined: 11/26/2008
Posts: 2,097
Proof that

SEND + MORE = MONEY
"Never regret, if its good, its wonderful. If its bad, its experience."
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YesuWangu
#16 Posted : Tuesday, February 28, 2012 3:44:46 PM
Rank: Elder

Joined: 8/11/2010
Posts: 1,588
dossy7 wrote:
Find the probabilities for each, using the standard normal distribution.
i). Pr(z < 1.42)
ii). Pr(z > −1.39)
iii). Pr(−2.46 < z < 1.74)

Seems people want to do maths today,haya there you go


Dang!

Insurgent, quickly change the thread to read 'arithmetic corner'.

Balaa like this one huwes mek.
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dunkang
#17 Posted : Tuesday, February 28, 2012 4:00:26 PM
Rank: Elder

Joined: 6/2/2011
Posts: 4,824
Location: -1.2107, 36.8831
A slab 175mm thick, d=145mm, is constructed with grade 30 concrete and is reinforced with 12mm bars at 150mm centers one-way and 10mm bars at 200mm centers in the other direction. Determine the maximum load that can be carried on an area 300x400mm without exceeding the ultimate shear stress. Take fy to be 460n/mm2.
Receive with simplicity everything that happens to you.” ― Rashi

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Mastermind
#18 Posted : Tuesday, February 28, 2012 4:10:02 PM
Rank: Veteran

Joined: 1/25/2012
Posts: 1,624
Location: Langley
Wait for one on Permutation. Na mtafute scientific calculator in advance
If you have built castles in the air, your work need not be lost; that is where they should be. Now put the foundations under them.
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Mastermind
#19 Posted : Tuesday, February 28, 2012 4:13:09 PM
Rank: Veteran

Joined: 1/25/2012
Posts: 1,624
Location: Langley
dunkang wrote:
A slab 175mm thick, d=145mm, is constructed with grade 30 concrete and is reinforced with 12mm bars at 150mm centers one-way and 10mm bars at 200mm centers in the other direction. Determine the maximum load that can be carried on an area 300x400mm without exceeding the ultimate shear stress. Take fy to be 460n/mm2.



Take fy to be 460n/mm2.[/quote] fy ndio nini?

If you have built castles in the air, your work need not be lost; that is where they should be. Now put the foundations under them.
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dunkang
#20 Posted : Tuesday, February 28, 2012 4:29:18 PM
Rank: Elder

Joined: 6/2/2011
Posts: 4,824
Location: -1.2107, 36.8831
Mastermind wrote:
dunkang wrote:
A slab 175mm thick, d=145mm, is constructed with grade 30 concrete and is reinforced with 12mm bars at 150mm centers one-way and 10mm bars at 200mm centers in the other direction. Determine the maximum load that can be carried on an area 300x400mm without exceeding the ultimate shear stress. Take fy to be 460n/mm2.



Take fy to be 460n/mm2.
fy ndio nini?

[/quote]

fy is the yield strength of the reinforcing bars. That of concerete is abbreviated as fcu.

HINT:

Maximum load = Vc x punching shear perimeter x d

and vc is 0.62n/mm2, so ignore fy and fcu since i have calculated it for you! (Just FYI, Vc is the shear force due to ultimate loads)!
Receive with simplicity everything that happens to you.” ― Rashi

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