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help with engineering mechanics!

• IfUWantHateMe

  26 Jun 08, 19:11

  if u know how to do pls pls pls help!thanks!
  
  The Figure shows a light horizontal beam ABC that is loaded by the force P = 300 N.  The beam is held in a state of equilibrium by the pin-joint at A and the light cable that passes through a smooth pulley at D.   The cable is attached to the beam at locations B and C.

  (a)  The tension in the cable is <!-- formCheckList.addElement( new Check_Answer( {ref_label:"1", name:"fib_plus-variable-x-_62111717_1"} ) ); // --> N;

  (b)(b)  The magnitude of the reaction at A is <!-- formCheckList.addElement( new Check_Answer( {ref_label:"1", name:"fib_plus-variable-y-_62111717_1"} ) ); // --> N.

  Give your answers to the nearest one decimal place.

  
  http://img79.imageshack.us/my.php?image=65799954ji0.png  (open with new window it helps=))

• newcomer

  26 Jun 08, 19:18

  i bloody hated this

• IfUWantHateMe

  26 Jun 08, 22:56

  Originally posted by newcomer:

  i bloody hated this

  
  well ur not alone =)

• purpledragon84

  26 Jun 08, 23:02

  no figure..?

   

• 16/f/lonely

  26 Jun 08, 23:04

  Originally posted by newcomer:

  i bloody hated this

  
  oh noez.....I so loved such physics problems.

• Spartans

  26 Jun 08, 23:09

  Originally posted by 16/f/lonely:

  
  oh noez.....I so loved such physics problems.

  
  Static Mechanics, not really physics.

• eagle

  26 Jun 08, 23:09

  cannot see any image

• 16/f/lonely

  26 Jun 08, 23:10

  Originally posted by Spartans:

  
  Static Mechanics, not really physics.

  
  Whatever you call this.

• IfUWantHateMe

  27 Jun 08, 00:23

  dunno why cant show pic but i added link already.anybody know how do?

• eagle

  27 Jun 08, 00:29

  I give you hint

  part a use moments of force with pivot A

  part b resolve vertical and horizontal forces

• IfUWantHateMe

  27 Jun 08, 00:48

  Originally posted by eagle:

  I give you hint

  part a use moments of force with pivot A

  part b resolve vertical and horizontal forces

  
  i tried for an hour for part a but i still cant get it..help pls =/

• maurizio13

  27 Jun 08, 00:51

  hate resolving forces.

• -*:+:MUSE:+:*-

  29 Jun 08, 13:38

  this is ez. this is the concept of rigid body. choose a pivot point and like let forces = 0.

  this is basic physics.

• -*:+:MUSE:+:*-

  29 Jun 08, 13:40

  "Static Mechanics, not really physics."

  = equilibrium = rigid body; rigid bodys part of physics.