A ladder 2.5 m long and 150 N weight has Us centre of gravity l m from the bottom. A weight 40 N is attached to the Top end. The work required to raise the ladder from the horizontal position to the vertical position is:

Question

A ladder 2.5 m long and 150 N weight has Us centre of gravity l m from the bottom. A weight 40 N is attached to the Top end. The work required to raise the ladder from the horizontal position to the vertical position is: (A) 190 J (B) 250 J (C) 285 J (D) 475 J

Tardigrade Admin · Accepted Answer

The work required to raise the ladder from horizontal to vertical position is given by Work done, W=mghcm+mgh =150× 1+40× 2.5 =150× 100=250 J

Q. A ladder 2.5 m long and 150 N weight has Us centre of gravity l m from the bottom. A weight 40 N is attached to the Top end. The work required to raise the ladder from the horizontal position to the vertical position is:

190 J

250 J

285 J

475 J

The work required to raise the ladder from horizontal to vertical position is given by Work done, $W = m g h_{c m} + m g h$ $= 150 \times 1 + 40 \times 2.5$ $= 150 \times 100 = 250 J$

Q. A ladder 2.5 m long and 150 N weight has Us centre of gravity l m from the bottom. A weight 40 N is attached to the Top end. The work required to raise the ladder from the horizontal position to the vertical position is:

190 J

250 J

285 J

475 J

The work required to raise the ladder from horizontal to vertical position is given by Work done, W=mghcm​+mgh =150×1+40×2.5 =150×100=250J

The work required to raise the ladder from horizontal to vertical position is given by Work done, $W = m g h_{c m} + m g h$ $= 150 \times 1 + 40 \times 2.5$ $= 150 \times 100 = 250 J$