# Q-17

$Thetwovectorsaregivenas{F}_{1}=2i+5k\phantom{\rule{0ex}{0ex}}{F}_{2}=3j+4k\phantom{\rule{0ex}{0ex}}Scalarproductoftwovectorsaregivenas=\overrightarrow{{F}_{1}}.\overrightarrow{{F}_{2}}\phantom{\rule{0ex}{0ex}}=\overrightarrow{{F}_{1}}\overrightarrow{{F}_{2}}\mathrm{cos}\theta =(2i+5k).(3j+4k)=20units(becausethedotproductofvectors\phantom{\rule{0ex}{0ex}}perpendiculartoeachotherisZeroas\mathrm{cos}{90}^{0}=0\phantom{\rule{0ex}{0ex}}andforvectorsmakingangle{0}^{0}than\mathrm{cos}{0}^{0}=1)$

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