Qualification > Math

M1 help..........URGENT!

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astarmathsandphysics:
Not home for 4 hours

nid404:
ok I figured the page no out...
gimme some time

nid404:
check the attachment for the diagram
19)
a) TQBcos 30= 3g
      TQB= 30/cos30=34.6N

b) TPQ= TQBsin 30  (since it's in equilibrium)
    TPQ= 17.32 N

TAP is resultant of the Weight of P and TPQ (look at the figure n analyse)
TAP2= 202+ 17.322
TAP= 26.5 N

sin theta= 20/26.5
theta= 49o approx

nid404:
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

nid404:
20) Check the diagram

TAB sin 60= 20N
TAB=23.1N  same for TCD
TAB cos 60 = TBC
TBC=11.5 N

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