A 020-Km Wide River Has a Uniform Flow Speed of 3

question 14

Multiple Choice

A 0.20-km wide river has a uniform flow speed of 3.0 m/s toward the east. A boat with a speed of 8.0 m/s relative to the water leaves the south bank and heads in such a way that it crosses to a point directly north of its departure point. How long does it take the boat to cross the river?

• A) 29 s
• B) 23 s
• C) 25 s
• D) 27 s
• E) 17 s

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Definitions:

Molecules

The smallest chemical units of a substance that retain its chemical properties, consisting of one or more atoms bonded together.

Cilia

Microscopic, hair-like structures that extend from the surface of many animal cells, involved in movement and sensory functions.

Flagella

Long, slender projections from a cell that are primarily used for locomotion, allowing the cell to move through liquid environments.

Messenger RNA

A type of RNA that carries genetic information from DNA to the ribosome, where it specifies the amino acid sequence of the protein products of gene expression.