IGCSE/GCSE/O & A Level/IB/University Student Forum

Qualification => Subject Doubts => GCE AS & A2 Level => Math => Topic started by: blast_23 on April 17, 2010, 01:55:48 pm

Title: M1 help..........URGENT!
Post by: blast_23 on April 17, 2010, 01:55:48 pm

i need help with those questions, please answer them with some explanation. ???
Thanks in advance! :-*



Note: this is especially for our mASTER, Mr. Astar!

Title: Re: M1 help..........URGENT!
Post by: nid404 on April 17, 2010, 02:07:56 pm

all of them?

Title: Re: M1 help..........URGENT!
Post by: Amr Fouad on April 17, 2010, 02:32:13 pm

Quote from: nid404 on April 17, 2010, 02:07:56 pm

all of them?

77plus they are not clear

Title: Re: M1 help..........URGENT!
Post by: blast_23 on April 17, 2010, 02:54:29 pm

Yes all of them please, if you can...Thanks  ;D

Title: Re: M1 help..........URGENT!
Post by: Amr Fouad on April 17, 2010, 02:57:58 pm

you scanned it upside down

its not clear! lol

Title: Re: M1 help..........URGENT!
Post by: astarmathsandphysics on April 17, 2010, 03:03:46 pm

Not home for 4 hours

Title: Re: M1 help..........URGENT!
Post by: nid404 on April 17, 2010, 03:26:03 pm

ok I figured the page no out...
gimme some time

Title: Re: M1 help..........URGENT!
Post by: nid404 on April 17, 2010, 04:26:51 pm

check the attachment for the diagram
19)
a) T_QBcos 30= 3g
      T_QB= 30/cos30=34.6N

b) T_PQ= T_QBsin 30  (since it's in equilibrium)
    T_PQ= 17.32 N

T_AP is resultant of the Weight of P and T_PQ (look at the figure n analyse)
T_AP²= 20²+ 17.32²
T_AP= 26.5 N

sin theta= 20/26.5
theta= 49^o approx

Title: Re: M1 help..........URGENT!
Post by: nid404 on April 17, 2010, 05:47:38 pm

21)

a) The furthest point is when t=40s   Look at the graph...after 40s, it remains where it is for another 10s...then it starts moving back...negative velocity indicates opp direction...so it's going back where it started from 50s onwards

b) a=v-u/t = 2/30=1/15 m/s2

c) from 0<t<40, it travels 30X3 + 5X3= 105m (area under the graph)
  from 50<t<120, it travels 1/2 X (120-50) X2 = 70m ( area under the graph) --> this is in the opp direction....displacement is -70m
therefore the distance from A is 105m-70m=35m

Title: Re: M1 help..........URGENT!
Post by: nid404 on April 17, 2010, 06:17:04 pm

20) Check the diagram

T^AB sin 60= 20N
T_AB=23.1N  same for T_CD
T_AB cos 60 = T_BC
T_BC=11.5 N

Title: Re: M1 help..........URGENT!
Post by: nid404 on April 17, 2010, 06:43:55 pm

I'm getting 1.805m for the first part...ms says 1.905...error?
im not sure of the rest...ill post it if im confident enough

Title: Re: M1 help..........URGENT!
Post by: Amr Fouad on April 17, 2010, 11:06:57 pm

Quote from: nid404 on April 17, 2010, 06:43:55 pm

I'm getting 1.805m for the first part...ms says 1.905...error?
im not sure of the rest...ill post it if im confident enough

Thanks a million nid!

+rep.

Title: Re: M1 help..........URGENT!
Post by: nid404 on April 18, 2010, 07:59:16 am

Quote from: ~ A.F ~ on April 17, 2010, 11:06:57 pm

Thanks a million nid!

+rep.

pleasure is all mine...
thanks... :)