A man uses a crowbar of length 1.5m to raise a load of 75 kgf by putting a sharp edge below the bar at a distance of 1m from his hand. (a) Draw a diagram of the arrangement showing the fulcrum (F), load (L) and effort (E) with their directions. (b) State the kind of lever. (c) Calculate (i) load arm, (ii) effort arm, (iii) mechanical advantage, and (iv) the effort needed.

A man uses a crowbar of length 1.5 m to raise a load of 75 kgf by putting a sharp edge below the bar at a distance 1 m from his hand. State the kind of lever and calculate the effort needed.

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A man uses a crowbar of length 1.5m to raise a load of 75kgf by putting a sharp edge below the bar at a distance 1m from his hand. Calculate the effort needed.

The correct option is D 37.5kgfLoad =75kgfLength of crowbar =1.5mEffort arm =1mSo, Load Arm =Length of crowbar - Effort arm⇒1.5−1=0.5mMechanical Advantage =Effort ArmLoad Arm=10.5=2Effort needed =LoadMechanical Advantage=752=37.5kgf

A man uses a crowbar of length $1.5 m$ to raise a load of $75 k g f$ by putting a sharp edge below the bar at a distance $1 m$ from his hand. Calculate the effort needed.