maths p21!!

[a.rambo]

what was the value for K?? where we had to calculate hemisphere tsa and volume? i got 486!

 

[yana.mmc]

I got 486(pi) too! i don't know if its right cause when I searched online most of the sites said the surface area is 2(pi)r^2 but i did it as 3(pi)r^2

 

[joanna omar]

what was the value for K?? where we had to calculate hemisphere tsa and volume? i got 486!

Me too cuz they said like the Total surface area was 286(pi) so I took the curves surface area of sphere divide 2 +are of the cirlcle
therefore radius is 9 which made the volume 486 ?

 

[a.rambo]

Yes. Radius was 9. And k was so there fore k is 486.

 

[.Luke.]

Me too cuz they said like the Total surface area was 286(pi) so I took the curves surface area of sphere divide 2 +are of the cirlcle
therefore radius is 9 which made the volume 486 ?

Wasnt the total surface area 243(pi)?

 

[Hamzeh S]

Do u think the grade boundary will be really high like 188 for A* like november 2011 variant 2 ?

 

[snipex]

Wrong the radius was 11.1

 

[joanna omar]

Yes. Radius was 9. And k was so there fore k is 486.

I did the same hope thats the right one !

 

[joanna omar]

guyss I am talking abt var 1 and idk abt other variants

 

[joanna omar]

Wrong the radius was 11.1

HOW ? :/

 

[snipex]

4pyr^2/2=2pyr^2
Then 286py=22r^2
Squuare root 286/22 then you get 11.1

 

[a.rambo]

4pyr^2/2=2pyr^2
Then 286py=22r^2
Squuare root 286/22 then you get 11.1

TOTAL SURFACE AREA for hemisphere is 3pir^2. 2pir^2 is only the surface area. Not toal surface area

 

[jsjhdjejf]

all of you are stupid (including me) correct answer: 54

view image to know why

 

[Hamzeh S]

all of you are stupid (including me) correct answer: 54

view image to know why

its 4/3*PI*R^3 lol

 

[Hamzeh S]

Guys if in the hemisphere question i got the total volume right but forgot to divide by 2 thus got a wrong answer how many marks will i lose ?
and in the ratio of airplane model to real airplane i converted m3 to cm3 by multiplying by a 1000 instead of 1 million so i got a wrong answer how many marks will i lose on this on ?

 

[jsjhdjejf]

its 4/3*PI*R^3 lol

yes you are right

 

[joanna omar]

all of you are stupid (including me) correct answer: 54

view image to know why

No dude answeer K is 486 and we are talking abt v1 which we had the surface area they gave was 286(pi)

 

[joanna omar]

Is the train Question we had to do 120*20 ? so the times is 60 sec ?

 

[jsjhdjejf]

Is the train Question we had to do 120*20 ? so the times is 60 sec ?

no it is 120+20/40= 140/40= 3.5

 

[joanna omar]

no it is 120+20/40= 140/40= 3.5

how and this 20 is the width of the bridge and not the lenght !!!
therefore its 120*20/40 = 60 sec !!!