The two blocks in an Atwood machine have masses 2.0kg and 3.0kg . Find the work done by gravity during the fourth second after the system is released from rest :-

Question

The two blocks in an Atwood machine have masses 2.0kg and 3.0kg . Find the work done by gravity during the fourth second after the system is released from rest :- <img class="img-fluid question-image" alt="Question" src="https://cdn.tardigrade.in/q/nta/p-i12pmaslrajooy61.jpg" /> (A) 70J (B) 210J (C) 140J (D) -140J

Tardigrade Admin · Accepted Answer

a=(3 - 2/3 + 2)g=(g/5) Distance covered in fourth second =((2 n - 1)/2)=((2 × 4 - 1) × g/2 × 5)=(7 g/10) Hence, work done by gravity =(m2 - m1)gh =(3 - 2)g× (7 g/10)=(7/10)g2

Q. The two blocks in an Atwood machine have masses $2.0 k g$ and $3.0 k g$ . Find the work done by gravity during the fourth second after the system is released from rest :-

$70 J$

$210 J$

$140 J$

$- 140 J$

$a = \frac{3 - 2}{3 + 2} g = \frac{g}{5}$
Distance covered in fourth second
$= \frac{( 2 n - 1 )}{2} = \frac{( 2 \times 4 - 1 ) \times g}{2 \times 5} = \frac{7 g}{10}$
Hence, work done by gravity $= (m_{2} - m_{1}) g h$
$= (3 - 2) g \times \frac{7 g}{10} = \frac{7}{10} g^{2}$

Q. The two blocks in an Atwood machine have masses 2.0kg and 3.0kg . Find the work done by gravity during the fourth second after the system is released from rest :-

70J

210J

140J

−140J