- #1
tronter
- 185
- 1
(a) A point is observed to have velocity [tex] v_A [/tex] relative to coordinate system [tex] A [/tex]. What is its velocity to coordinate system [tex] B [/tex] which is displaced from system [tex] A [/tex] by distance [tex] R [/tex]? ([tex] R [/tex] can change in time)
I think its [tex] v_B = v_A - \frac{dR}{dt} [/tex]. But I am not completely sure why this is the case.
(b) Particles [tex] a [/tex] and [tex] b [/tex] move in opposite directions around a circle with angular speed [tex] \omega [/tex], as shown. At [tex] t = 0 [/tex] they are both at the point [tex] r = l \bold{j} [/tex], where [tex] l [/tex] is the radius of the circle. Find the velocity of [tex] a [/tex] relative to [tex] b [/tex].
So [tex] v_B = v_A - \frac{dR}{dt} [/tex]
[tex] = (\sin t \bold{i }+ \cos t \bold{j)} \omega - (\cos t \bold{i} - \sin t \bold{j}) [/tex].
Is this correct?
I think its [tex] v_B = v_A - \frac{dR}{dt} [/tex]. But I am not completely sure why this is the case.
(b) Particles [tex] a [/tex] and [tex] b [/tex] move in opposite directions around a circle with angular speed [tex] \omega [/tex], as shown. At [tex] t = 0 [/tex] they are both at the point [tex] r = l \bold{j} [/tex], where [tex] l [/tex] is the radius of the circle. Find the velocity of [tex] a [/tex] relative to [tex] b [/tex].
So [tex] v_B = v_A - \frac{dR}{dt} [/tex]
[tex] = (\sin t \bold{i }+ \cos t \bold{j)} \omega - (\cos t \bold{i} - \sin t \bold{j}) [/tex].
Is this correct?