Ram used a crowbar of length 1.5 m as a II^(nd) order lever to displace a heavy sphere placed on the horizonat surface. If the crowbar applies a force of 240 N on the sphere at a distance of 100 cm from effort, then find the minimum effort applied by Ram to displace it.

Ram used a crowbar of length 1.5 m as a II^(nd) order lever to displac

1.	Ram used a crowbar of length 1.5 m as a II^(nd) order lever to displace a heavy sphere placed on the horizonat surface. If the crowbar applies a force of 240 N on the sphere at a distance of 100 cm from effort, then find the minimum effort applied by Ram to displace it.
Answer» Solution : CROWBAR ACT as IInd order lever as shown below: To APPLY minimum effort should be applied at the top of the crowbar as shown in the figure, then Effort arm = Length of the crowbar = 1.5 m = 150 cm Load arm = 150 cm-100 cm = 50 cm `MA=("Effort arm")/("Load arm")=(150)/(50)=3` `E=(L)/(MA)=(240)/(3)=80` Minimum effort = 80 N