GO Figure 12-62 is an overhead view of a rigid rod that turns about a vertical axle until the identical rubber stoppers A and B are forced against rigid walls at distances r A = 7.0 cm and r B = 4.0 cm from the axle. Initially the stoppers touch the walls without being compressed, Then force F → of magnitude 220 N is applied perpendicular to the rod at a distance R = 5.0 cm from the axle. Find the magnitude of the force compressing (a) stopper A and (b) stopper B. Figure 12-62 Problem 51.
GO Figure 12-62 is an overhead view of a rigid rod that turns about a vertical axle until the identical rubber stoppers A and B are forced against rigid walls at distances r A = 7.0 cm and r B = 4.0 cm from the axle. Initially the stoppers touch the walls without being compressed, Then force F → of magnitude 220 N is applied perpendicular to the rod at a distance R = 5.0 cm from the axle. Find the magnitude of the force compressing (a) stopper A and (b) stopper B. Figure 12-62 Problem 51.
GO Figure 12-62 is an overhead view of a rigid rod that turns about a vertical axle until the identical rubber stoppers A and B are forced against rigid walls at distances rA = 7.0 cm and rB = 4.0 cm from the axle. Initially the stoppers touch the walls without being compressed, Then force
F
→
of magnitude 220 N is applied perpendicular to the rod at a distance R = 5.0 cm from the axle. Find the magnitude of the force compressing (a) stopper A and (b) stopper B.
Uniform Circular motion.
1. Mini Lecture
2. Let the position of a particle be given by:
(t) = Rcos (wt)i + Rsin (wt)j
3. Calculate the expression for the velocity
vector and show that the velocity vector is
tangential to the circumference of the circle.
4. Calculate the expression for the acceleration
vector and show that the acceleration vector
points radially inward.
5. Calculate the magnitude of the velocity and
magnitude of the acceleration, and therefore
show that
v2
a =
R
4. A ball is thrown vertically up, its speed.
slowing under the influence of gravity.
Suppose (A) we film this motion and play
the tape backward (so the tape begins with
the ball at its highest point and ends with it
reaching the point from which it was
released), and (B) we observe the motion of
the ball from a frame of reference moving
up at the initial speed of the ball. The ball
has a downward acceleration g in:
a. A and B
b. Only A
c. Only B
d. Neither A nor B
2. Consider a 2.4 m long propeller that
operated at a constant 350 rpm. Find the
acceleration of a particle at the tip of the
propeller.
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