A Puck Moves on a Horizontal Air Table

question 6

Multiple Choice

A puck moves on a horizontal air table.It is attached to a string that passes through a hole in the center of the table.As the puck rotates about the hole,the string is pulled downward very slowly and shortens the radius of rotation,so the puck gradually spirals in towards the center.By what factor will the puck's angular speed have changed when the string's length has decreased to one-half of its original length?

• A)2
• B)4
• D)1
• E)1/2

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Definitions:

Equilibrium

A state of balance in a market, where demand equals supply, and economic forces are at rest.

Welfare Economics

Normative evaluation of markets and economic policy.

Equilibrium

A state in which market supply and demand balance each other, resulting in stable prices and quantities.

Efficient

Refers to a level of performance that uses the least amount of inputs to achieve the highest amount of output.