The speed of sound
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- The volume V of a sphere of radius r changes over time t. a. Find an equation relating dV>dt to dr>dt. b. At what rate is the volume changing if the radius increases at 2 in>min when the radius is 4 inches? c. At what rate is the radius changing if the volume increases at 10 in3>min when the radius is 5 inches?arrow_forwardA hose feeds into a small screen box of volume 20 cm³ that is suspended in a swimming pool. Water flows across the surface of the box at rate 38 cm³/s. Estimate div(v)(P), where v is the velocity field of the water in the pool and P is the center of the box. (Use decimal notation. Give your answer to one decimal place.) div(v)(P) = What are the units of div(v)(P)? The units of div(v) (P) are perarrow_forwardThe flow rate of a pipe, Q in (m/s) is given by Q = dV where V is dt volume (in m) and t is time in (s). The volume in a pipe at time t is given in Table 1. Table 1 4 6 t, s 2 8 10 V(t), m3 7.56 3.87 5.09 6.34 4.59 Estimate the flow rate Q at time t = 4s by using: (a) 2-Point Forward Difference (b) 2-Point Backward Difference (c) 3-Point Central Differencearrow_forward
- For many species of fish, the allometric relationship between the weight W and the length L is approximately W = kL3, where k is a constant. Find the rate of change of the weight as a corresponding rate of change of the length. (dL/dt)arrow_forwardFlank wear data were collected in a series of turning tests using a coated carbide tool on hardened alloy steel at a feed of 0.30 mm/rev and a depth of cut 4.0 mm. At a speed of 125 m/min, flank wear = 0.12 mm at 1 min, 0.27 mm at 5 min, 0.45 mm at 11 min, 0.58 mm at 15 min, 0.73 at 20 min, and 0.97 mm at of 25 min. At a speed of 175 m/min, flank wear = 0.22 mm at 1 min, 0.47 mm at 5 min, 0.70 mm at 9 min, 0.80 mm at 11 min, and 0.99 mm at 13 min. The last value in each case is when final tool failure occurred. (a) On a single piece of linear graph paper, plot flank wear as a function of time for both speeds. Using 0.50 mm of flank wear as the criterion of tool failure, determine the tool lives for the two cutting speeds. (b) On a piece of natural log-log paper, plot your results determined in the previous part. From the plot, determine the values of n and C in the Taylor Tool Life Equation. (c) As a comparison, calculate the values of n and C in the Taylor equation solving…arrow_forwardSuppose a raindrop evaporates as it falls but maintains its spherical shape. Assume that the rate at which the raindrop evaporates (that is, the rate at which it loses mass) is proportional to its surface area, where the constant of proportionality is –0.01. The density (mass per volume) of water at 3.98°C is 1 g/cm3. The surface area of a sphere is 4πr2, and its volume is 4πr3/3, where r is the radius. Assume no air resistance. (Project 8 models the motion of this raindrop under the influence of air resistance.) Assume that the initial radius is 0.3 cm. Determine the raindrop’s initial mass. Write a differential equation for the rate of change of mass as a function of r. Write an equation for r as a function of massarrow_forward
- An outdoor decorative pond in the shape of a hemispherical tank is to be filled with water pumped into the tank through an inlet in its bottom. Suppose that the radius of the tank is R = 10 ft, that water is pumped in at a rate ofT ft/min, and that the tank is initially empty. As the tank fills, it loses water through evaporation. Assume that the rate of evaporation is proportional to the area A of the surface of the water and that the constant of proportionality is k = 0.01. Output: water evaporates at rate proportional to area A of surface ER- Input: water pumped in at rate 7 ft/min (a) hemispherical tank (b) cross-section of tank (a) The rate of change dv of the volume of the water at time t is a net rate. Use this net rate to determine a differential equation for the height h of the water at time t. The volume of the water shown in the figure is V = TRh -Th, dt where R = 10. Express the area of the surface of the water A = Tr2 in terms of h. dh dt (b) Solve the differential…arrow_forwardThe radius of a star(spherical) was r=a and was observed to increase by 0.01%. Use a linear approximation to estimate the percentage its surface area increased byarrow_forward
- Functions and Change: A Modeling Approach to Coll...AlgebraISBN:9781337111348Author:Bruce Crauder, Benny Evans, Alan NoellPublisher:Cengage Learning