# Maths Task-Applications, modelling, logger pro

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Grids on pages 5 and 9 can be used to sketch graphs.
PART 1
PROBLEM 1 TheRichter scale(2+ 1 + 1 +2=6marks)
The Richter scale is used to compare the intensities of earthquakes. The Richter scalereading,
I
R, is given by the function R = log10
, where I is the intensity of the earthquakeand I0 is a
I0
low base-level intensity.
A Richter reading of 5.5 represents a strong earthquake capable of causing damage to
buildings.
(a) What is the Richter scale reading of an earthquake that is 10 times as strong?
(b) What is the Richter scale reading of an earthquake that is 100 times as strong?
(c) What is the Richter scale reading of an earthquake that is 1000 times as strong?
(d) An earthquake has a Richter scale reading of 7.9. How many times stronger is
thisearthquake than the one for which the reading is 5.5?
PROBLEM 2Resale Value(3 + 3 + 4 + 12 = 22 marks)
Cars lose value or depreciate from the moment that they are delivered to their first owner. In
the
early years they lose large amounts. As the price drops, the amount of depreciation reduces
also.
Adele has just bought a new car and is keen to investigate how well it will retain its value.
She
used an Internet database of car prices to obtain the median price of cars of her make and
model
of different ages. The results are shown in the table.
(a)Plot the data and comment on the result.
(b)Adele suspects that her make of car loses between 8 and 14% of the remaining value
eachyear. She initially uses a trial-and-error approach to find the depreciation rate, using
anexponential model.
Complete the following table to determine the rule for the value of the car, at time t years,for
depreciation (negative growth) rates of 8 to 14%.
(c)On the same set of axes as the plot for part a above, graph the remaining value, V,
fordepreciation rates of 8%, 10%, 12% and 14%. Which of these depreciation rates best
fitsthe data?
(d)An exponential model can have a rule of the form V(t) = a × bt.
(i)Show that, by taking the logarithm (of any base, k) of both sides, the result is
logkV(t) = logk(a) + tlogk(b).
(ii)Explain why, for an exponential model, the plot of logkV(t) versus t will result in
astraight line of gradient equal to logk(b) and vertical intercept equal to logk(a).
(iii)Hence plot logeV(t) versus t. Comment on the result. (Note: loge is entered as
LN formost CAS calculators.)
(iv)Use least squares regression to find the equation of the line of best fit.
(v)Hence find the values of a and b that best fit the data, and write the rule for V(t).
(vi)Compare the rules and depreciation rates found by using regression with those
foundusing trial and error.
PROBLEM 3
Drug doses
(4 + 6 + 6 + 6 = 22
marks)
A doctor prescribes a particular medication for a patient. Over a period of time the
medication is broken down and absorbed by the body. The level of medication, y, in the
patients blood at time t hours is given by y = A × 0.9t, where A mg/L is the initial dose.
(a)
Plot graphs of y against t for A = 0.1, 0.2, 0.3, 0.4. (Use t = 0, 1, 2, 3  8.) In each
case estimate the length of time it takes for the level of medication in the patients
blood to be halved. Does this value depend on A? Why?
(b)
Suppose that the dosage is such that the initial dose is A = 0.4 mg/L and this dosage is
repeated every 4 hours for 24 hours.
(i) Initiallyf1 = 0.4 ? 0.9t (the model for the first four hours, 0Statistics>Stat Claculations>Sinusoidal Regression.

(c)

Estimate the height of the water at each of the following times:

(i) 1:30 pm

(d)

(e)

(ii)

3:30 pm

(iii)

11:30 pm

At what times in the 24 hour period is the water 4 metres in depth?

For what periods of time is the water depth increasing?

Question 4: Bungee Jump Practical Application Task( 5 marks)
In Unit 1, Week 11, students were asked to complete a Data Logging activity as part of
the graded task. This activity used the program called Logger Pro. The programming
licence allows current DECV students to install the program on their home computers.
It can be accessed from the Toolbox on the online site. In Unit 2, once again you are
expected to use Logger Pro to complete anapplication task. For this practical
application task involving a Bungee Jump, you will examine videos of real motion that
can be modelled using trigonometric equations.
Using the Logger Pro software programand the files from the Bungee Jump folder on
a spring. You are asked to model this motion using Logger Proand write a report. The
report need not be longer than two A4 sheets of paper. Further details are given after the
sample screen shown, and are also included in the Bungee Jump folder on your course
CD (under Further Resources). It is also available on the online course.
You may choose to extend the task by creating and analysing your own video of
cyclical motion such as a pendulum.
Once you learn to use the tools available with Logger Pro, the task is relatively straight
forward. However if you did not complete the Data Logging Activity in Unit 1, please
contact your teacher who will assist you in the use of the Logger Pro program.
You should find that modelling this real data will give you a much deeper understanding of
trigonometry than answering conventional textbook questions.
A sample screen from the Bungee Jumping activity usingLogger Pro is shown below.
The picture shows a frame from the video of a bungee jump. The force/time,
distance/time and velocity/time graphs of the motion are displayed on the right.

Bungee JumpData Logging with Logger Pro
To complete this activity you need to use the Logger Pro program as well as the Bungee
Jump series of files, including video files and data files, which are included in the CD you
received at the start of this unit. Both the Logger Pro program and the Bungee Jump files
are available on the online course.
This is what you need to do.
it now. You will be prompted to install Quick Time as well. If you do not already
have Quick Time on your computer, you will need to agree to this.
2. Open the Bungee Jump files. It contains data gathered from a few experiments. It
also contains videos of these experiments and explanations about how to use the
Logger Pro program.
3. Open and play the three ~Using Logger Pro and the Introduction to Bungee files.
4. Open and view the Bungee 1.avi file to see the first bungee jump. Then open Bungee
1.cmbl file to see the results from this first Bungee jump using the Data Logger
program.
Finally open the Bungee 1 trial.cmbl file to see the final results and analysis of this
first bungee jump.
5. Choose Bungee 2 and model the force, distance and velocity using sine and cosine
curves using a similar process as was done for the first bungee jump.
6. Copy and paste photos, graphs and tables into a Word document and write up a report.
Include calculations stating the amplitude and period of the graphs, as well as the
equations for the distance/time, force/time and velocity/time graphs. State a few
distance, force and velocity values for specific times. The report should include an
introduction explaining the experiment, a main part with the explanation of the
models you found and a conclusion stating what you learned.

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