« previous next »
Pages: [1]   Go Down

Author Topic: c4 vectors quick question  (Read 676 times)

Offline zabady

  • Newbie
  • *
  • Posts: 29
  • Reputation: 55
c4 vectors quick question
« on: May 02, 2010, 06:46:44 pm »
i want part C
Logged

Offline astarmathsandphysics

  • SF Overlord
  • *********
  • Posts: 11271
  • Reputation: 65534
  • Gender: Male
  • Free the exam papers!
Re: c4 vectors quick question
« Reply #1 on: May 02, 2010, 07:34:00 pm »
When i get home. On a phone now.
Logged

Offline T.Q

  • SF Master
  • ******
  • Posts: 1557
  • Reputation: 5081
  • Gender: Male
Re: c4 vectors quick question
« Reply #2 on: May 02, 2010, 08:43:54 pm »
for part c


distance PQ=\sqrt{90}


R= (1+3s)i + (4+s)j+(2)k

so

distance  PR=\sqrt{10s^2 }

PQ=PR

\sqrt{90}=\sqrt{10s^2 }

Squer  both sides

90=10s^2

s=\pm3

now substitute S in L2

and find the coordinates 
Logged
No Matter What Happens In Life , Just Don't Lose Hope :)
Pages: [1]   Go Up
« previous next »