આપેલ અક્ષને અનુલક્ષીને શરૂઆતમાં સ્થિર પડેલા પદાર્થની જડત્વની ચાકમાત્રા \(1.5\, kg\, m^2\) છે.પદાર્થ પર ભ્રમણીય ગતિઊર્જા \(1200\, J\) કરવા માટે તેના પર \(20\, rad/s^2\) નો કોણીય પ્રવેગ તેની અક્ષ પર ....... \((\sec)\) સમય સુધી આપવો પડે.

A \(2\)
B \(5\)
C \(2.5\)
D \(3\)

Verified Solution

Answer & Solution

Correct Answer

(A) \(2\)

Step-by-step Solution

Detailed explanation

\(KE = \frac{1}{2}I{\omega ^2} = 1200\left( {given} \right)\) \( \Rightarrow \omega = 40\,rad/s\) \(\,\,\,\,\,\,\,\omega = {\omega _0} + \alpha t\) \(\,\,\,\,\,\,\,40 = 0 + \left( {20} \right)\,t\) \( \Rightarrow t = 2\,\sec .\)

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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