here,
d1 = 5.31 * ( cos(65.4) j + sin(65.4) k)
d1 = 2.21 j m + 4.83 k m
d2 = 2.23 * ( cos(38.3) i + sin(38.3) k)
d2 = 1.75 i + 1.38 K m
a)
d1 . d2 = ( 2.21 j m + 4.83 k m ) . (1.75 i m + 1.38 k m ) = 6.67 m^2
b)
d1 X d2 = ( 2.21 j m + 4.83 k m ) X (1.75 i m + 1.38 k m )
d1 X d2 = ( - 2.21 * 1.75 k + 2.21 * 1.38 i + 4.83 * 1.75 j)
d1 X d2 = 3.05 i m + 8.45 j m - 3.87 k m
the x- component is 3.05 m
c)
the y- component is 8.45 m
d)
the z- component is - 3.87 m
e)
the angle between d1 and d2 , theta = arccos(d1.d2/(|d1|*|d2|))
theta = arccos(6.67 /( sqrt(2.21^2 + 4.83^2)) * sqrt(1.75^2 + 1.38^2))
theta = 55.7 degree
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