The forces of magnitude [গণিত] and [গণিত] respectively have a resultant [গণিত] . If the first force is doubled then the resultant is doubled. Find the angle between forces?
ক. [গণিত]
খ. [গণিত]
গ. [গণিত]
ঘ. [গণিত]
উত্তর: [গণিত]
ব্যাখ্যা: P = 3, Q = 2 আমরা জানি, লব্ধি, R = P 2 + Q 2 + 2PQcosa = 32 + 22 + 2 ' 3 ' 2 cosa = 9 + 4 + 12cosa = 13 + 12 cosa P = 6 হলে, (2R)2 = 62 + 22 + 2.6.2 cosa Þ 4R 2 = 36 + 4 + 24 cosa Þ 4R 2 = 40 + 24 cosa Þ R 2 = 10 + 6 cosa 13 + 12 cosa = 10 + 6 cosa [গণিত]
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The forces of magnitude and respectively have a resultant . If the first force is doubled then the resultant is doubled. Find the angle between forces?
- ক.
- খ.
- গ.
- ঘ.
উত্তর