Kinematics 6 Question 3

3. In the cube of side ’ a ’ shown in the figure, the vector from the central point of the face ABOD to the central point of the face BEFO will be

(2019 Main, 10 Jan I)

(a) 12a(i^k^)

(b) 12a(j^i^)

(c) 12a(j^k^)

(d) 12a(k^i^)

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Answer:

Correct Answer: 3. (b)

Solution:

  1. In the given cube, coordinates of point G (centre of face ABOD) are x1=a2,y1=0,z1=a2

where, a= side of cube

and coordinates of point H are

x2=0,y2=a2,z2=a2

So, vector GH is

GH=(x2x1)i^+(y2y1)j^+(z2z1)k^=a2i^+a2j^=a2(j^i^)



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