Practice question
एक तरल प्रवाह के लिए वेग विभव फलन (velocity potential function) φ = 9x2 + 4y2 + 3x + 4y - 7 द्वारा दिया गया है। मूल बिंदु (0,0) पर वेग के परिमाण की गणना करें:
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