we should take mg+ma or mg-ma???

One end of the steel wir eof area of cross section $3 mm^2$ is attached to the ceiling of an elevator moving v/s with an acceleration of 2.2 $m/s^2$ . If a load of 8 kg is attached at its free end , then the stress (in N/m2) developed in the wire will be

8000000

16000000

20000000

32000000

Answers (1)

L Lovekush Kumar Saini

$\begin{aligned} & \mathrm{As}, T=m\left(g+a_{0}\right)=10(10+2)=120 N\\ &\text { Stress }=\frac{T}{A}=\frac{120}{2 \times 10^{4}}=60 \times 10^{4} \mathrm{Nm}^{-2} \ \text {and } Y=\frac{\text { Stress }}{\text { Strain }}, \text { Strain }=\frac{\text { Stress }}{Y}\\ &=\frac{60 \times 10^{4}}{2 \times 10^{11}}\\ &=30 \times 10^{-7} \\ &= 3 \times 10^{-6} \end{aligned}$

Knockout JEE Main April 2021

An exhaustive E-learning program for the complete preparation of JEE Main..

₹ 22999/- ₹ 14999/-

Buy Now

Knockout JEE Main April 2022

An exhaustive E-learning program for the complete preparation of JEE Main..

₹ 34999/- ₹ 24999/-

Buy Now

Test Series JEE Main Sept 2020

Take chapter-wise, subject-wise and Complete syllabus mock tests and get in depth analysis of your test..

₹ 4999/- ₹ 1999/-

Buy Now

Knockout JEE Main Sept 2020

An exhaustive E-learning program for the complete preparation of JEE Main..

₹ 12999/- ₹ 6999/-

Buy Now

Rank Booster JEE Main 2020

This course will help student to be better prepared and study in the right direction for JEE Main..

₹ 9999/- ₹ 4999/-

Buy Now

Exams

Colleges

Predictors

Resources

Quick links

Exams

Colleges

Resources

Colleges

Resources

Exams

Exams

Colleges

Predictor

Resources

Exams

Predictors

Resources

Upcoming Events

Exams

Ranking

Products & Resources

NCERT Solutions

Exams

Country

Resources

Exams

Colleges

Predictors

Resources

Exams

Colleges

Predictors

Resources

Engineering Preparation

Government Jobs

Medical Preparation

Exams

Colleges

Predictors

Resources

Resources

Exams

Colleges

Predictors

Exams

Predictors

Colleges

Resources

Exams

Colleges

Resources

Exams

Resources

One end of the steel wir eof area of cross section is attached to the ceiling of an elevator moving v/s with an acceleration of 2.2 . If a load of 8 kg is attached at its free end , then the stress (in N/m2) developed in the wire will be A. 8000000 B. 16000000 C. 20000000 D. 32000000

Similar Questions

Preparation Products

Knockout JEE Main April 2021

Knockout JEE Main April 2022

Test Series JEE Main Sept 2020

Knockout JEE Main Sept 2020

Rank Booster JEE Main 2020

Ask Question

Register to post Answer