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Concept explainers
Allometric growth in biology refers to relationships between sizes of parts of an organism (skull length and body length, for instance). If L1(t) and L2(t) are the sizes of two organs in an organism of age t, then L1 and L2 satisfy an allometric law if their specific growth rates are proportional:
where k is a constant.
(a) Use the allometric law to write a differential equation relating L1 and L2 and solve it to express L1 as a function of L2.
(b) In a study of several species of unicellular algae, the proportionality constant in the allometric law relating B (cell biomass) and V (cell volume) was found to be k = 0.0794. Write B as a function of V.
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Chapter 9 Solutions
Calculus: Early Transcendentals
- PREVIOUS ANSWERS ASK YOUR TEACHER PRACTICE ANOTHER Find the derivative of the function. f'(x) = X x + √3x f(x) = 3x-5 (3√√3x+11√√x+5√3 2√√x (3x-5)² Need Help? Read It SUBMIT ANSWERarrow_forwardPREVIOUS ANSWERS ASK YOUR TEACHER PRACTICE A Find the derivative of the function and evaluate f'(x) at the given val f(x) = (√√√x + 3x) (x3/2 - x); x = 1 f'(x) = 9x 412 (12x (13) 2 - 4x-3√√√x f'(1) = 2 Need Help? Read It Watch It SUBMIT ANSWERarrow_forwardConsider the following functions. g(x) = x + √3x h(x) = 3x-5 x + √3x f(x) = = 3x-5 Find the derivative of each function. g'(x) h'(x) = = f'(x) = 3 = +1 2√3x 3 (3√3x + 10√√x +5√√√3 2√√x (3x-5)² Need Help? Read It SUBMIT ANSWERarrow_forward
- "Solve the following differential equation using the Operator Method and the Determinant Method:" y'''' + 3y'"' + 3y'' + y = xarrow_forwardpractice for exam please helparrow_forwardFig. 4.22. Problems 4.1 (A). Determine the second moments of area about the axes XX for the sections shown in Fig. 4.23. [15.69, 7.88, 41.15, 24; all x 10-6 m. All dimensions in mm IAA inn 100 25 50 25 50 80 50 50 Fig. 4.23. X 80 60arrow_forward
- 4.3 (A). A conveyor beam has the cross-section shown in Fig. 4.24 and it is subjected to a bending moment in the plane YY. Determine the maximum permissible bending moment which can be applied to the beam (a) for bottom flange in tension, and (b) for bottom flange in compression, if the safe stresses for the material in tension and compression are 30 MN/m² and 150 MN/m² respectively. Y [32.3, 84.8 kNm.] 150 100 50 -25 +50-50-50-50- All dimensions in mmarrow_forward"Find the values of V1, V2, and V3 by solving the following differential equation system:" 1 L1 1 X - X x 2 - 2x x2 x3 x² - 4x + 2] M Larrow_forward1. Consider the function f(x) whose graph is given below. Use the graph to determine the following: 2 a) All x for which f'(x) is positive. b) All x for which f'(x) is negative. 2 -2 c) The x for which f'(x) is zero. (please depict this on the graph)arrow_forward
- 4. Suppose that the population of a certain collection of rare Brazilian ants is given by P(t)=(t+100) In(t+2), Where t represents the time in days. Find and interpret the rates of change of the population on the third day and on the tenth day.arrow_forwardFind all values of x for f (x)=(x²-4) 4 where the tangent line is horizontal. 5. Find the slope of the tangent line to the graph of f(x)=-√8x+1 at x=1. Write the equation of the tangent line.arrow_forward3. Find the derivative of each function. Label with appropriate derivative notation showing both dependent and independent variables. f(t)=4t(2t⭑+4)³ a. f(t)=4t (2t+4)³ (Answer must be factored.) b. y= 3 1 (2x³-4) 6arrow_forward
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