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Ch. 2 - Limits and Continuity
Hass - Thomas' Calculus 15th Edition
Hass15th EditionThomas' CalculusISBN: 9780137616077Non è quello che usi tu?Cambia libro di testo
Tutti i libri di testoHass 15th EditionCh. 2 - Limits and ContinuityProblema 25b
Capitolo 2, Problema 25b

The accompanying graph shows the total distance s traveled by a bicyclist after t hours.
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b. Estimate the bicyclist’s instantaneous speed at the times t=1/2, t=2, and t=3.

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To estimate the bicyclist's instantaneous speed at a given time, we need to find the derivative of the distance function s with respect to time t, which represents the speed. This is done by calculating the slope of the tangent line to the curve at the specified time.
For t = 1/2, identify the point on the graph where t = 1/2 and draw a tangent line at this point. Estimate the slope of this tangent line by choosing two points on the tangent line and using the formula for slope: \( \text{slope} = \frac{\Delta s}{\Delta t} \).
Repeat the process for t = 2. Locate the point on the graph where t = 2, draw the tangent line, and estimate its slope using two points on the tangent line.
Similarly, for t = 3, find the point on the graph where t = 3, draw the tangent line, and estimate the slope using two points on the tangent line.
The estimated slopes at t = 1/2, t = 2, and t = 3 will give you the bicyclist's instantaneous speeds at these times. Remember, the slope of the tangent line at a point on the graph of a function is the derivative of the function at that point, which represents the instantaneous rate of change.

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Instantaneous Speed

Instantaneous speed refers to the speed of an object at a specific moment in time. In calculus, it is determined by finding the derivative of the position function with respect to time. This derivative gives the rate of change of distance with respect to time, allowing us to calculate how fast the bicyclist is moving at particular instances.
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Derivatives Applied To Velocity

Derivative

The derivative is a fundamental concept in calculus that measures how a function changes as its input changes. It represents the slope of the tangent line to the graph of the function at a given point. In the context of the bicyclist's distance function, the derivative at a specific time gives the instantaneous speed at that moment.
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Derivatives

Graph Interpretation

Interpreting graphs is crucial in calculus as it allows us to visualize relationships between variables. In this case, the graph of total distance versus time helps us understand how the bicyclist's speed changes over time. By analyzing the slope of the graph at specific points, we can estimate the instantaneous speed at those times.
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Graphing The Derivative
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[Technology Exercise] Let f(t) = 1/t for t≠0.

         

a. Find the average rate of change of f with respect to t over the intervals (i) from t=2 to t=3, and (ii) from t=2 to t=T.

         

b. Make a table of values of the average rate of change of f with respect to t over the interval [2,T], for some values of T approaching 2, say T = 2.1, 2.01, 2.001, 2.0001, 2.00001, and 2.000001.

         

c. What does your table indicate is the rate of change of f with respect to t at t=2?

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