SATHEE: Work Power and Energy 5 Question 11

Work Power and Energy 5 Question 11

14. Consider an elliptically shaped rail $P Q$ in the vertical plane with $O P = 3$ $m$ and $O Q = 4 m$ . A block of mass $1 k g$ is pulled along the rail from $P$ to $Q$ with a force of $18 N$ , which is always parallel to line $P Q$ (see figure). Assuming no frictional losses, the kinetic energy of the

block when it reaches $Q$ is $(n \times 10) J$ . The value of $n$ is (take acceleration due to gravity $= 10 m s^{- 2}$ )

(2014 Adv.)

Analytical & Descriptive Questions

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Answer:

Correct Answer: 14. $50 J$

Solution:

From work-energy theorem

Work done by all forces = change in kinetic energy

$or W_{F} + W_{m g} = K_{f} - K_{i}$

$\begin{aligned} 18 \times 5 + (1 \times 10) (- 4) = K_{f} \\ 90 - 40 = K_{f} or K_{f} = 50 J = 5 \times 10 J \end{aligned}$

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Work Power and Energy 5 Question 11

14. Consider an elliptically shaped rail PQ in the vertical plane with OP=3 m and OQ=4m. A block of mass 1kg is pulled along the rail from P to Q with a force of 18N, which is always parallel to line PQ (see figure). Assuming no frictional losses, the kinetic energy of the

Analytical & Descriptive Questions

Answer:

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