One way might be to place the center of the triangle at the origin and orient the triangle such that
the instantaneous velocity of Vc is along the y-axis.
Then resolve the velocities into their x-y components.
Note that then VBy = VAy, VCx = 0, and VAx = - VBx at that instant in time
I missed the fact that the vine is 18 meters long so you could find the initial angle
using 18 meters for the length of the vine and the vertical drop from that
point is 3.2 m to the bottom of the swing.
(Then, of course, he really wouldn't drop 3.2 m if the vine breaks
before he reaches the...
I agree with this answer.
Your method of balancing torques is interesting - I mean the term (Tsin30⋅4).
Usually, one would include the force at the pivot point of the bar and then eliminate this
force when balancing the translational forces.
You have apparently done this indirectly.
The moment of inertia I of a body about any axis is equal to the moment of inertia
I CM of the body about a parallel axis through its center of mass plus the mass M of the
body times the square of the perpendicular distance L between the axes:
I = Icm + M L^2.
For a cylinder about an edge I =...
Taking torque about the bottom point is a convenient way of eliminating
the frictional force.
Are you familiar with the parallel axis theorem?
You can also apply Newton's equations about the center of mass
to eliminate the frictional force.
Static electricity has a way of dissipating.
Try to avoid any sharp points (pointed ends of connecting wires, etc.)
Alligator clips should work OK.
You might try folding the edges of the foil strips to get rid of the sharp edges.
Also, the bowl would have to be clean to prevent leakage between...
Maybe it would help to resolve the issue if you calculated the "contracted" distance that
each ship travels and then the time to traverse this distance.
Use the 100 min. that you calculated as measured by Liz.
In my earlier post I implied that use of a spring scales would show discontinuities in the motion.
Kinematics seems to indicate that this is not the case and a scales would be
of little or no use.
As indicated in post #8 other factors must be at work here such as
(work in bending the cords...