Solve the Problem. -A Traffic Counter Consists of a Thin Black Tube Stretched

question 42

Essay

Solve the problem.
-A traffic counter consists of a thin black tube stretched across a street or highway and
connected to a "brain box" at the side of the road. The device registers one "count" each
time a set of wheels (that is, wheels on a single axle)rolls over the tube. A normal
automobile (two axles)registers two counts, and a light truck (three axles)registers three
counts. Suppose that, during a one-hour period, a particular counter registers 41 counts on
a residential street on which only two-axle vehicles (cars)and three-axle vehicles (light
trucks)are allowed. How many cars and light trucks passed over the traffic counter? Find
all the possible solutions to the problem.

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Definitions:

Effector

(1) A muscle or gland that contracts or secretes in direct response to nerve impulses. (2) In homeostasis, an organ or process that helps restore a steady state.

Set Point

A normal condition maintained by homeostatic mechanisms.

Steady State

A condition where the variables (such as concentration of substances) in a system remain constant over time despite ongoing processes that attempt to change them.

Homeostatic Response

The process by which organisms regulate internal conditions, such as temperature and pH, to maintain a stable internal environment.