Jim weighs 60 kilograms and needs to lift a 300-kilogram rock. His crowbar is 1.5 meters long. How close must the fulcrum be to the rock so that Jim's weight can lift the rock?

• Answer is : 0.15
  To balance the 300kg on both the sides we need to place the fulcrum at 1.5/2=0.75
  So to get equilibrium b/w 300 and 60 we need to place the rock at
  x=(60*0.75)/300
  i.e x= 0.15
  Answer is :0.15
• 12 years agoHelpfull: Yes(0) No(3)
• Answer: 0.25 m
  let d be the distance between the fulcrum and the rock.
  => 1.5 -d is the distance between Jim and the fulcrum
  Using Work Done= Force*Distance
  
  60(1.5-d)=300d
  1.5-d=5d
  6d=1.5
  d=0.25m
• 6 years agoHelpfull: Yes(0) No(0)