Motion in two dimensions, in a plane can be studied by expressing position, velocity and acceleration as vectors in Cartesian co-ordinates where are unit vector along x and y directions, respectively and Ax and Ay are corresponding components of (Fig). Motion can also be studied by expressing vectors in circular polar co-ordinates as A=Arr + where ? =r/r=cos and are unit vectors along direction in which ‘r’ and ‘q ’ are increasing.
(a) Express in terms of q.
(b) Show that both q are unit vectors and are perpendicular to each other.
(c) Show that d(r)/dt , where w =dq/dt q and dq/dt = -wr
(d) For a particle moving along a spiral given by r=aqr , where a = 1 (unit), find dimensions of ‘a’.
(e) Find velocity and acceleration in polar vector representation for particle moving along spiral described in (d) above.
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