2. In the position shown, bar AB has a constant angular velocity of 3 rad/s counterclockwise. (a) Determine the angular velocity of bars BD and DE. (b) Determine the angular acceleration of bars BD and DE. (BJ 15.51 on page 723)
2. In the position shown, bar AB has a constant angular velocity of 3 rad/s counterclockwise. (a) Determine the angular velocity of bars BD and DE. (b) Determine the angular acceleration of bars BD and DE. (BJ 15.51 on page 723)
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Please do not solve the question.
My question is why is the angle for Vb -71.57 degree? Shouldn't it be (180+18.43) = 198.43 degree since it is measured from the positive x-axis?
Transcribed Image Text:A
2. In the position shown, bar AB has a constant angular
velocity of 3 rad/s counterclockwise.
100 mm
В
(a) Determine the angular velocity of bars BD and DE.
(b) Determine the angular acceleration of bars BD and DE.
200 mm
(BJ 15.51 on page 723)
Solution:
E
(a) Set up E-xy. The geometry is given as
225 mm
75mm
'BD = = 225 (mm)
= 200 (mm), ľDE
А
)= 18.43°
-1
B = tan¬
1
B
= 300 sec(18. 43°)= 316.23 (mm),
I BA
y
ВА
Using ö, = 3 k (ccw)(rad/s) and right-hand rule gives
@, x řBA = 3(316.23)Z-71.57° = 948.7Z–71.57°.
VB
2
В
E
DO
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