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Calculus and Beyond Homework Help
Finding the sum vector given only the moduli and angle
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[QUOTE="K.QMUL, post: 4641050, member: 489509"] [h2]Homework Statement [/h2] Given two 2-dimensional vectors [itex]\overline{a}[/itex] and [itex]\overline{b}[/itex] of moduli l[itex]\overline{a}[/itex]l = 3u and l[itex]\overline{b}[/itex]l = 4u, and forming an angle of 120 degrees between them, determine the modulus of the sum vector [itex]\overline{s}[/itex] = [itex]\overline{a}[/itex] + [itex]\overline{b}[/itex] and the angle between [itex]\overline{s}[/itex] and [itex]\overline{a}[/itex]. [h2]Homework Equations[/h2] a.b = l[itex]\overline{a}[/itex]ll[itex]\overline{b}[/itex]lcosθ [h2]The Attempt at a Solution[/h2] All if have calculated is the dot product of vectors a and b, coming to (6u[SUP]2[/SUP]). I cannot seem to figure out what I can do to find the sum of these vectors only given the moduli and angle between them. Please Help :-) [/QUOTE]
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Calculus and Beyond Homework Help
Finding the sum vector given only the moduli and angle
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