द्वितीयक उपापचयज किसे कहते हैं ? उदाहरण सहित समझाइये।
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Explanation:
The line of action of the force 6-1-21. passes through the point whose position vector is
-1+k. Find (a) Moment of force about the origin
(b) The moment of force about the point of position vector i+k
(c) The moment of force about the y-axis
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