Mathematics: Post your doubts here!

[Fallin' staR]

Did anyone give Mechanics 2 exam? how was it? I had trouble solving the last two questions, is there anyone to talk about it?

 

[abdul moeed rana]

Se

second part ...buddy......second question second part......can u tell me how u solve it

7p4 * 6!

 

[RoOkaYya G]

7p4 * 6!

he asked 2nd part of question 7

 

[Lostsoul]

Help!
In how many ways can 13 cards in a pack of 52 cards be arranged?

 

[asadalam]

Guys this a question in the psifi evaluation form.i need the answer today.any maths masters understand what this is?please help out asap

 

[Haya Ahmed]

guys can you help me solve this question .. it is Mechanics 1 .. the answer is -1/30 m/s^2

 

[Haya Ahmed]

Guys I'm completely scared from this .. I'm A2 student .. I got in maths in AS p1 - 68/75 and in S1 got 44/50 ... no for A2 should I continue with S2 or take M1 ?? as I'm going for engineering they said I'll need M1 ... BUT it seems to be difficult for me as we started kinamatics .. I got in physics AS a (C) grade sadly ... so does it have to do anything with physics AS ?? ... or it will be easy ? because kinamatics questions I'm stuck in them from now !. ... so S2 OR M1 ? ... and If M1 ! can someone send me notes and videos for M1 Please .. because our maths teacher doesn't teach anything in the class and he depends totally on our physics AS experience .. he is very cruel in teaching ... so I need help .. thanks all !!

 

[chishtyguy]

Guys I'm completely scared from this .. I'm A2 student .. I got in maths in AS p1 - 68/75 and in S1 got 44/50 ... no for A2 should I continue with S2 or take M1 ?? as I'm going for engineering they said I'll need M1 ... BUT it seems to be difficult for me as we started kinamatics .. I got in physics AS a (C) grade sadly ... so does it have to do anything with physics AS ?? ... or it will be easy ? because kinamatics questions I'm stuck in them from now !. ... so S2 OR M1 ? ... and If M1 ! can someone send me notes and videos for M1 Please .. because our maths teacher doesn't teach anything in the class and he depends totally on our physics AS experience .. he is very cruel in teaching ... so I need help .. thanks all !!

for engineering, you definitely need M1. tutorials can be found on https://www.khanacademy.org . if u have any confusion in any question, people here are available throughout the year, you can ask the questions S2 is not of much use, and M1 is very simple even if you have the basic concepts of physics

 

[chishtyguy]

guys can you help me solve this question .. it is Mechanics 1 .. the answer is -1/30 m/s^2

use s=ut+0.5at^2 twice
first time use 1=u*3+0.5*a*3^2 to get 3u+4.5a=1
second time use 2=u*8+0.5*a*8^2 to get 8u+32a=2 or 4u+16a=1
solve simultaneously

 

[chishtyguy]

Help!
In how many ways can 13 cards in a pack of 52 cards be arranged?

52P13

 

[RoOkaYya G]

52P13

shldnt combination be used here? as well as permutation ofc

 

[chishtyguy]

shldnt combination be used here? as well as permutation ofc

no. all cards are different and they are to be arranged and not chosen.

 

[RoOkaYya G]

no. all cards are different and they are to be arranged and not chosen.

owwkay .-.
ty

 

[Lostsoul]

Help:
If the letters of the word 'MINIMUM' are arranged in a line at random. What is the probability that the arrangement begins with MMM?

 

[Lostsoul]

Again:
In how many ways can 10 students be arranged in a way that 2 youngest are separated?

 

[Lostsoul]

I. How many 4 digit numbers can be formed from the digits 1,2,3 and 5 If repetitions are not allowed?

II. How many 4 digit numbers divisible by 5 can be formed from the digits above?

 

[Keirad]

I. How many 4 digit numbers can be formed from the digits 1,2,3 and 5 If repetitions are not allowed?

II. How many 4 digit numbers divisible by 5 can be formed from the digits above?

I- 4!
II- 3!

 

[Lostsoul]

I- 4!

Thanks
For part II you take it as non repeating again?

Why not 3! +/× 2! ?

Thanks in advance

 

[Keirad]

For II
Sorry...my mistake
If it can be repeated then it will be 4^3

 

[Snowysangel]

find normal (n hat) by doing cross product with the direction of line l and the directon vector A.

replace in the formula r. n hat = a . n hat

a can be the point in line equation (4,-2,2)

replace n u get the answer.

That's the normal to the plane right? How do you find it?