(a) Express the vector ~A= (Ax,Ay) = (−5 m,−2 m) using unit vectors ˆı and ˆ|.?

(a) Express the vector ~A= (Ax,Ay) = (−5 m,−2 m) using unit vectors ˆı and ˆ|.


Also express ~A in magnitude and direction form (|~A |, ), where the angle is measured


with respect to the positive x-axis, anticlockwise angles being positive.


(b) An acceleration vector of magnitude 9.81 m/s2 makes an angle of 75 with the positive


z-axis. Find the scalar components of the vector parallel to and perpendicular to the zaxis.


You now rotate the z-axis until the scalar acceleration component parallel to the


z-axis changes sign, becoming equal to the negative of its previous value. What now is the


angle between the vector and the z-axis?


(c) When vector ~C is subtracted from vector ~D , the resulting vector is equal to twice the


sum of the two vectors. Write this condition as a statement in vector algebra involving


~Cand ~D


. Show that this requires that ~D is a scalar multiple of ~C. Find the ratio of


the magnitudes of the two vectors, and the angle between them. Draw a diagram to show


their relationship.

(a) Express the vector ~A= (Ax,Ay) = (−5 m,−2 m) using unit vectors ˆı and ˆ|.?
what are u studying?"vectors" im very poor in that chapter will u help me?
Reply:The last I heard, physics was an elective course. If you do not wish to learn it, why don't you drop the course?

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