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1.6 Exponentials and logarithms

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Question 60

A study explores the relationship between the basal metabolic rate, RRR (measured in Watts), and the body mass, mmm (measured in kilograms), of various mammals. A graph of log⁡10R\log_{10} Rlog10​R against log⁡10m\log_{10} mlog10​m is found to be a straight line. Data for two specific mammals are plotted as points on this line: Mammal A at (0.35,1.22)(0.35, 1.22)(0.35,1.22) and Mammal B at (2.75,3.14)(2.75, 3.14)(2.75,3.14).

ai.

Find the equation of the straight line in the form

log⁡10R=a+blog⁡10m \log_{10} R = a + b \log_{10} m log10​R=a+blog10​m

where aaa and bbb are constants to be found.

[2]
aii.

Show that R=KmnR = Km^nR=Kmn, where KKK and nnn are constants to be determined.

[3]
b.

A different mammal has a basal metabolic rate of approximately 250 Watts. Use your answer to part (a)(ii) to find an estimate for the body mass mmm of this mammal.

[2]

1.6 Exponentials and logarithms Questions

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