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m द्रव्यमान तथा `d_1` घनत्व की छोटी गेंद को ग्लिसरीन (घनत्व `d_2`) से भरे बर्तन में डाल देने पर, कुछ समय बाद वेग नियत हो जाता है। गेंद पर कार्यरत श्यान बल कितना होगा ?

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वेग नियत होने पर त्वरण a= 0|
श्यान बल = द्रव में गेंद का भार =3 `mg(1-(d_2)/(d_1))`

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