a. From the top point of the circle, a ball begins to slide along a smooth chute
at an angle φ to the vertical. How long will it take for it to reach the circle, if
its diameter is D?
b. From point A, small beads begin to slide along the spokes with different
slopes at the same time without friction. What curve will the beads be on at
time t?
∗) If the figure for the problem indicates the acceleration of gravity g, it is
necessary to take into account the gravity field.