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- Step 1 of 8Suppose A and B are two vectors, the dot productof these two vectors will be written as A·B.The dot product of the two vectors is the product of themagnitude of the two vectors and the cosine of the angle betweenthem.Similarly the cross product of the same two vectors is .The cross product of the two vectors is the magnitude of thisvector equal to the product of the magnitudes of the two vectors,and the sine of the angle between them.Here, is a unit vector represents the direction of
- Step 2 of 8From the equation (1),, the dot product of the same unit vectorsis given asSince the vectors i, j, k are perpendicular to eachother, the dot product of a different unit vector is given as.https://newmotor947.weebly.com/visual-studio-2015-enterprise-iso-download.html. From equation (2), the cross product of the two different unitvectors isAs the order of multiplication changes, the sign of the crossproduct also changes.
- Step 3 of 8(a)The following diagram shows two vectors making an angle with horizontal, C making an angle with horizontal. The sum of the vectors making an angle with horizontal.
- Step 4 of 8As shown from the above diagram, the x component ofvector are respectively.The sum of the components isThe vector addition of two vectors is which makes angle with the horizontal.The x component of is .ThereforeNow multiply by both sides then ,Thus dot product is distributive.
- Step 5 of 8SimilarlyNow multiply by both sides thenIf is the unit vector pointing out of page then.Thus cross product is distributive.
- Step 6 of 8(b)In the general let us consider that the vectors A,B, and C can be written in terms of their componentsalong the x, y, and z directions. Leti, j, and k be the unit vectors along thex, y, and z directions, respectively. So thevectors can be written asHere,Ax and Ay are the componentsof A along the x and y axes, respectively.Bx and By are thecomponents of B along the x and y axes,respectively.Cx and Cy are thecomponents of C along the x and y axes,respectively.Now,And isFrom (1) and (2)Therefore in general dot product is distributive.
- At A*B+A*C we need to replace one of the = signs with a + sign
- Step 7 of 8For cross product to be distributive, We have to prove that
- Step 8 of 8From the equations (3) and (4),Therefore in general cross product is distributive.