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Solve the all parts of following problem:
Problem: You have seen dogs shake to shed water from their fur. The motion is complicated, but the fur on a dog's torso rotates back and forth along a roughly circular arc. Water droplets are held to the fur by contact forces, and these forces provide the centripetal acceleration that keeps the droplets moving in a circle, still attached to the fur, if the dog shakes gently. But these contact forces - like static friction - have a maximum possible value. As the dog shakes more vigorously, the contact forces cannot provide sufficient centripetal acceleration and the droplets fly off. A big dog has a torso that is approximately circular, with a radius of 16cm . At the midpoint of a shake, the dog's fur is moving at a remarkable 2.5m/s.
Part I: What force is required to keep a 10 mg water droplet moving in this circular arc?
Part II: What is the ratio of this force to the weight of a droplet?
I need help to find what force is required to keep a 10 mg water droplet moving in this circular arc.
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