Tie a small paper cup to a string, attaching it at two points near the rim as

Question:

Tie a small paper cup to a string, attaching it at two points near the rim as shown in the diagram. Take a marble or other small object and place it in the cup.a. Whirl the cup in a horizontal circle. Does the marble stay in the cup? (Be careful! A flying marble can be dangerous.)b. Whirl the cup in a vertical circle. Does the marble stay in the cup? What keeps the marble in the cup at the top of the circle?c. Try slowing the cup down. Does the marble stay in the cup?d. If you are brave, try replacing the marble with water. Under what conditions does the water stay in the cup??