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1. The maximum running speed (S) in km/hr and the corresponding body mass (m) in kg were
determined for 55 different species of mammals. An empirical relation was determined to be:
S[km/hr] = 5.7 (m[kg]). Note: The notation in this equation means, "inserting the mass (m) in units of
‘kg', automatically calculates the maximum running speed (S) in units of ‘km/hr.
(a) What are the implied units for the "5.7" factor? Hint: recall that relations between physical quantities
must be dimensionally consistent, and the chosen units must in turn be consistent with the
dimensionality.
(b) Re-write the equation so that it gives the maximum speed in units of “m/s" for a given body mass in
"g”. Show all relevant details. If done correctly, you will need to use at least one unit conversion
factor.
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1. The maximum running speed (S) in km/hr and the corresponding body mass (m) in kg were
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