Find the orientation sign of \((1,0,0)\times(0,1,0)\cdot(0,0,1)\).
Question 15
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A triangular plate has vertices \(A=(1,0,2)\), \(B=(2,2,2)\), and \(C=(4,0,-1)\). Find its area and a unit normal vector.
Question 16
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Compute \((2,-1,1)\times(1,3,-2)\).
Question 17
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Show that \((2,-1,1)\times(1,3,-2)\) is perpendicular to \((2,-1,1)\).
Question 18
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Find the sine of the angle between \((1,0,1)\) and \((0,1,1)\), then use it to find the area of the parallelogram they span.
Question 19
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For the triangle with vertices \(A=(0,0,0)\), \(B=(1,2,0)\), and \(C=(0,1,3)\), find a normal vector and decide which side of the triangle the point \(P=(6,-3,1)\) lies on relative to that normal.
Question 20
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A force \((0,5,0)\) N is applied at \((2,0,1)\) m. Find the torque about the origin, its magnitude, and explain whether the torque is perpendicular to the force.