Grade 10General Physics

i am not understandin the concept of dot product nd cross product...

plzz explain me ....i am not understanding WHY is it used for????thnku

ajinkya bhole

16 Years agoGrade 10

1 Answer

SAGAR SINGH - IIT DELHI

15 Years ago

Dear student,

The Dot Product

We define the dot product of two vectors

v = ai + bj and w = ci + dj

to be

v ^. w = ac + bd

The Cross Product Between Two Vectors

Definition
Let u = ai + bj + ck and v = di + ej + fk be vectors then we define the cross product v x w by the determinant of the matrix:

W e can compute this determinant as

= (bf - ce) i + (cd - af) j + (ae - bd) k

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i am not understandin the concept of dot product nd cross product... plzz explain me ....i am not understanding WHY is it used for????thnku

ajinkya bhole

1 Answer

SAGAR SINGH - IIT DELHI

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i am not understandin the concept of dot product nd cross product...

plzz explain me ....i am not understanding WHY is it used for????thnku

. Because of the rotation of the earth, a plumb bob may not hang exactly along the direction of
the earth’s gravitational pull (its weight) but deviates slightly from this direction. Calculate the
deviation (a) at 40 latitude, (b) at the poles, and (c) at the equator