   Chapter 7, Problem 30P

Chapter
Section
Textbook Problem

A pail of water is rotated in a vertical circle of radius 1.00 m. (a) What two external forces act on the water in the pail? (b) Which of the two forces is most important in causing the water to move in a circle? (c) What is the pail’s minimum speed at the top of the circle if no water is to spill out? (d) If the pail with the speed found in part (c) were to suddenly disappear at the top of the circle, describe the subsequent motion of the water. Would it differ from the motion of a projectile?

(a)

To determine
The two external forces act on the water in the pail.

Explanation

When a pail of water is rotated in a vertical cycle, there will be two external forces acting on the water. One is the gravitational force due to the weight of the water. Another one is the contact force exerted by the pail on the water...

(b)

To determine
which of the external force is important in causing the water to move in a circle.

(c)

To determine
The minimum speed of the pill at the top of the circle if no water is to spill out.

(d)

To determine
the subsequent motion of the water if the disappears suddenly from the top of the circle.

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