You Are Given the Shape of the Vertical Ends of a Trough

question 27

Multiple Choice

You are given the shape of the vertical ends of a trough that is completely filled with water. Find the force exerted by the water on one end of the trough. (The weight density of water is $62.4 \mathrm { lb } / \mathrm { ft } ^ { 3 }$ .)

• A) \(780 \mathrm { lb }\)
• B) \(312 \mathrm { lb }\)
• C) \(156 \mathrm { lb }\)
• D) \(1,560 \mathrm { lb }\)

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Definitions:

Density-Dependent Factor

An environmental factor whose effects on a population change as population density changes; tends to retard population growth as population density increases and enhance population growth as population density decreases. Compare with density-independent factor.

Negative Feedback

A regulatory mechanism in which a stimulus causes an opposite output in order to maintain an ideal level of whatever is being regulated.

Type-II Survivorship

A survivorship curve in which individuals are equally likely to die at any age, representing a relatively constant mortality rate throughout the organism's life.

Exponential Growth

Growth that occurs at a rate that becomes ever more rapid in proportion to the growing total number or size.