MHT CET 2019 2nd May Evening Shift | Elasticity Question 9 | Physics

A lift is tied with thick iron ropes having mass ' $M$ '. The maximum acceleration of the lift is ' $a$ ' $\mathrm{m} / \mathrm{s}^2$ and maximum safe stress is ' S ' $\mathrm{N} / \mathrm{m}^2$. The minimum diameter of the rope is

$\left[\frac{6 M(g+a)}{\pi S}\right]^{\frac{1}{2}}$

$\left[\frac{4 M(g+a)}{\pi S}\right]^{\frac{1}{2}}$

$\left[\frac{M(g+a)}{\pi S}\right]^{\frac{1}{2}}$

$\left[\frac{M(g-a)}{\pi S}\right]^{\frac{1}{2}}$

MHT CET 2019 2nd May Morning Shift

MCQ (Single Correct Answer)

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1. Two identical wires of substances ' $P$ ' and ' $Q$ ' are subjected to equal stretching force along the length. If the elongation of ' $Q$ ' is more than that of ' $P$ ', then

both $P$ and $Q$ are equally elastic

$P$ is more elastic than $Q$

$P$ is plastic and $Q$ is elastic

$Q$ is more elastic than $P$

MHT CET 2019 2nd May Morning Shift

MCQ (Single Correct Answer)

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Work done in stretching a wire through 1 mm is 2 J . What amount of work will be done for elongating another wire of same material, with half the length and double the radius of cross section, by 1 mm ?

2 J

4 J

8 J

16 J

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