Ask & Answer Question

System of Particles and Rotational Motion physics ncert solutions class 11th Physics Class 11th

The angular speed of a fly wheel moving with uniform angular acceleration changes from 1200rpm to 3120 in 16 seconds. The angular acceleration in $r a d / s^{2}$ is:

Option 1 -

$2 π$

Option 2 -

$4 π$

Option 3 -

$12 π$

Option 4 -

$104 π$

2 Views | Posted a month ago

Asked by Shiksha User

1 Answer

Answered by

Raj Pandey | Contributor-Level 9

a month ago

Correct Option - 2

Detailed Solution:

$\begin{array}{r} ω = ω_{0} + α t \\ α = \frac{ω - ω_{0}}{t} \\ = \frac{(3120 - 1200)}{16 s} r p m \\ = \frac{1920}{16} \times \frac{2 π}{60} r a d / s^{2} \\ = 4 π r a d / s^{2} \end{array}$

0 Upvotes 0 Downvotes

Similar Questions for you

The position vector of 1kg object is $\vec{r} = (3 \hat{i} - \hat{j}) m$ and its velocity $\vec{v} = (3 \hat{j} + \hat{k}) m s^{- 1} .$ The magnitude of is angular momentum is $\sqrt[]{x} N m$ where x is________.

Raj Pandey

$\overset{?}{L} = \overset{?}{r} * m \overset{?}{v}$

= $(3 \hat{i} ? \hat{j}) * (3 \hat{j} + \hat{k})$

$= 9 \hat{k} + 3 (? \hat{j}) ? \hat{i}$

$= ? \hat{i} ? 3 \hat{j} + 9 \hat{k}$

$| \overset{?}{L} | = \sqrt[]{1 + 9 + 81} = \sqrt[]{91}$

Match List – I with List – II

Choose the correct answer from the options given below:

Raj Pandey

Use formula for M.I.

A shell of mass $m$ is at rest initially. It explodes into three fragments having mass in the ratio $2 : 2 : 1$ . If the fragments having equal mass fly off along mutually perpendicular directions with speed $v$ , the speed of the third (lighter) fragment is :

Raj Pandey

The ratio of the radius of gyration of a thin uniform disc about an axis passing through its centre and normal to its plane to the radius of gyration of the disc about its diameter is :

Raj Pandey

Two objects of mass $10 k g$ and $20 k g$ respectively are connected to the two ends of a rigid rod of length 10 $m$ with negligible mass. The distance of the centre of mass of the system from the $10 k g$ mass is :

Raj Pandey

$X_{C M} = \frac{20 * 10}{20 + 10} = \frac{20}{3} m$

Get authentic answers from experts, students and alumni that you won't find anywhere else

On Shiksha, get access to

65k Colleges
1.2k Exams
686k Reviews
1800k Answers

Community GuidelinesUser Points System

QuestionsDiscussionsTags

The angular speed of a fly wheel moving with uniform angular acceleration changes from 1200rpm to 3120 in 16 seconds. The angular acceleration in $r a d / s^{2}$ is:

1 Answer

Similar Questions for you

Learn more about...

Most viewed information

Share Your College Life Experience

Didn't find the answer you were looking for?

Need guidance on career and education? Ask our experts

Your Question

The angular speed of a fly wheel moving with uniform angular acceleration changes from 1200rpm to 3120 in 16 seconds. The angular acceleration in r a d / s 2 is:

1 Answer

Similar Questions for you

Learn more about...

Most viewed information

Share Your College Life Experience

Didn't find the answer you were looking for?

Need guidance on career and education? Ask our experts

Your Question

The angular speed of a fly wheel moving with uniform angular acceleration changes from 1200rpm to 3120 in 16 seconds. The angular acceleration in $r a d / s^{2}$ is: