Qualification > Math

M1 HELP NEEDED, RIGHT NOW!!

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mousa:
Hello everyone, i need help with those couple of questions.
Please explain your steps in detail and clearly.

Q 7) ii .....Nov 2008

Q6) Nov 2004

Thanks.

nid404:
Nov 08
Q7

integrate acc, ull get velocity, integrate velocity, ull get distance...

double integration of (10 ? 0.3t)

v=dat=10t-0.3t2/2 +5
s=dvt= 10t2/2 - 0.3 t3/2X3 +5t
       = 5t2 - 0.3t3/6 + 5t
substitute t=2.5 (since 0.5sec taken to travel uptil A)
s=42.97
total s= 42.97+1.25
        =44.2m

nid404:
nov 2004

one of my fav qs

i) F<= uR
    <=0.75 8000
F<= 6000

ii) F max on top box= uR=.4 x4000=1600=400a a<=4

P-6000=3200
pmax=9200

mousa:

--- Quote from: nid404 on April 07, 2010, 06:40:21 pm ---nov 2004

one of my fav qs

i) F<= uR
    <=0.75 8000
F<= 6000

ii) F max on top box= uR=.4 x4000=1600=400a a<=4

P-6000=3200
pmax=9200


--- End quote ---

i am confused about the 2nd part, can you explain more?

nid404:
Fmax on top box<=1600
F=ma
hence a<=4

P-6000=ma
Pmax-6000=800X4
P=3200+6000
=9200

If there has to be no slipping in the system, both should move together....and that will happen only when they both have the same accn

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