Relative Velocity: a Long-Distance Swimmer Is Able to Swim Through

question 14

Multiple Choice

Relative velocity: A long-distance swimmer is able to swim through still water at 4.0 km/h. She wishes to try to swim from Port Angeles, Washington, directly north to Victoria, British Columbia, a distance of 50 km. An ocean current flows through the Strait of Juan de Fuca from west to east at 3.0 km/h. In what direction (relative to north) should she swim to make the crossing along a straight line between the two cities?

• A) 37° west of north
• B) 37° east of north
• C) 41° west of north
• D) 41° east of north
• E) 49° west of north

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Definitions:

Obsession

A persistent, intrusive, and unwanted thought or urge that causes significant anxiety or distress.

Repeatedly Checking

Compulsive behaviors characterized by the need to check things over and over, often associated with obsessive-compulsive disorder (OCD).

Agoraphobia

An anxiety disorder characterized by an intense fear of being in situations where escape might be difficult or help wouldn't be available if things go wrong.

Panic Attack

A sudden onset of intense fear or discomfort, characterized by symptoms such as rapid heartbeat, sweating, and feelings of doom.