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Obligatoriske oppgaver for uke 3

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Velg egenskapene som stemmer for et produkt av vektorer $a$ og $b$, hvor $\\theta$ er en vinkel mellom dem

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Velg en eller flere riktige påstander for et skalarprodukt

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Velg en eller flere riktige påstander for et kryssprodukt

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Det er gitt tre punkter  $A=(\\var{a},\\var{b},\\var{c})$, $B=(\\var{d},\\var{f},\\var{g})$, $C=(\\var{a},\\var{b},\\var{m})$. 

\n

La vektor $a=\\overrightarrow{AB}$ og vektor $b=\\overrightarrow{AC}$

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Finn vektor $a$ 

\n

Den første koordinaten er [[0]]

\n

Den andre koordinaten er [[1]]

\n

Den tredje koordinaten er [[2]]

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Finn vektor $b$ 

\n

Den første koordinaten er [[0]]

\n

Den andre koordinaten er [[1]]

\n

Den tredje koordinaten er [[2]]

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Finn kryssproduktet $a\\times b$ 

\n

Den første koordinaten er [[0]]

\n

Den andre koordinaten er [[1]]

\n

Den tredje koordinaten er [[2]]

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Finn arealet av trekanten $ABC$.

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Et plan går gjennom punktet $P=(\\var{a},\\var{b},\\var{c})$ og har normalvektor $n=(\\var{d},\\var{f},\\var{g})$

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Likningen til planet er på formen $ax+by+cz=d$ der

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$a=$ [[0]]

\n

$b=$ [[1]]

\n

$c=$ [[2]]

\n

$d=$ [[3]]

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Et punkt er gitt ved polarkoordinatene $r=\\var{r}$ og $\\theta=\\frac{\\var{k}\\pi}{\\var{a}}$. Finn de kartesiske koordinatene $x$ og $y$.

\n

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$x$ = [[0]]

\n

$y$ = [[1]]

\n

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Et punkt er gitt ved kartesiske koordinater $(\\var{x},\\var{y},\\var{z})$. Finn de sylindriske koordinatene $r$, $\\tan\\theta$ og $z$, og oppgi svaret på eksakt form.

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Hint: Numbas-syntaks for $\\sqrt{K}$ er sqrt(K) 

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$r$ = [[0]]

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$\\tan\\theta$  = [[1]]

\n

$z$ = [[2]]

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Et punkt er gitt ved sfæriske koordinater $\\rho=\\var{r}$, $\\phi=\\frac{\\var{l}\\pi}{\\var{b}}$ og $\\theta=\\frac{\\var{k}\\pi}{\\var{a}}$ (se bildet). Finn de kartesiske koordinatene $x$, $y$ og $z$.

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$x$ = [[0]]

\n

$y$ = [[1]]

\n

$z$ = [[2]]

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5 minutter igjen

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