A Puck on a Frictionless Air Hockey Table Has a Mass

question 21

Multiple Choice

A puck on a frictionless air hockey table has a mass of 5.0 g and is attached to a cord passing through a hole in the surface as in the figure. The puck is revolving at a distance 2.0 m from the hole with an angular velocity of 3.0 rad/s. The cord is then pulled from below, shortening the radius to 1.0 m. The new angular velocity (in rad/s) is:

• A)4.0
• B)6.0
• C)12
• D)2.0
• E)8.0

---

Definitions:

Economies of Scale

The cost advantages that enterprises obtain due to their scale of operation, typically resulting in the reduction of cost per unit.

Aircraft Production

The process and industry involved in designing, manufacturing, and assembling aircraft.

Newspaper Printing

The process of mass-producing copies of a newspaper document, whereby the news and other data are printed onto papers.

Economies of Scale

The cost advantage that arises with increased output of a product, where the average cost per unit decreases as the scale of production rises.