A Child on a Sled Starts from Rest at the Top

question 8

Multiple Choice

A child on a sled starts from rest at the top of a 15° slope. If the trip to the bottom takes how long is the slope? Assume that frictional forces may be neglected.

• A) 293 m
• B) 586 m
• C) 1130 m
• D) 147 m

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Definitions:

Conducting System

A network in the heart that electrically controls and coordinates heart muscle contractions.

SA Node

The sinoatrial node, a group of cells in the right atrium of the heart that acts as a natural pacemaker by initiating the heart's electrical impulses.

Purkinje Fibers

Specialized conducting fibers located in the heart's ventricles that help regulate the heart's rhythm.

Heart Skeleton

Fibrous connective tissue that provides a point of attachment for cardiac muscle cells, electrically insulates the atria from the ventricles, and forms the fibrous rings around the valves.