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michael benavides

michael b.

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Question#2 (5 marks) Water flows through the coils (with a diameter of 13 mm) of the heat exchanger at a flow rate of 0.2 L/s. The horizontal section of the heat exchanger is 4.0 m long, and the height of the vertical section is 0.5 m, as shown in the figure. Determine: a) The pressure drop between the inlet and the outlet of the vertical device. b) The power required by the pump in watts (W) to maintain this flow rate, assuming the pump has an efficiency of 70%. Use the following data: Return bend loss coefficient $K_L = 1.4$ Pipe roughness $= 1.52 \times 10^{-6}$ m Kinematic viscosity of water $= 1.66 \times 10^{-6}$ m²/s Density of water $= 1000$ kg/m³ Threaded 180° return bend copper pipe (drawn tubing)

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Find the weighted average of the numbers 1 and 8, with a weight of two-fifths on the first number and three-fifths on the second number. 5.2 3.5 4.8 1.6

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If the diet is lacking an essential amino acid what will happen?

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Consider the following cash flows for two types of models: Both models will have no salvage value upon their disposal (at the end of their respective service lives). The firm's 𝑀𝐴𝑅𝑅 is known to be 15%. a) Notice that both models have different service lives. However, Model A will be available in the future with the same cash flows. Model B is available now only. If you select Model B now, you will have to replace it with Model A at the end of year 2. If your firm uses the present worth as a decision criterion, which model should be selected, assuming that your firm will need one of the two models for an indefinite period? b) Suppose that your firm will need either model for only two years. Determine the salvage value of Model A at the end of year 2 that makes both models indifferent (equally likely).

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\( 1 \quad\left(\frac{2}{3}\right)^{2} \) is equal to (A) \( \frac{4}{6} \) (B) \( \frac{4}{3} \) (?) \( \frac{2}{9} \) (b) \( \frac{4}{9} \) 2. What percentage of 340 is 425 ? (A) \( 80 \% \) (B) \( 85 \% \) (C) \( 125 \% \) (D) \( 152 \% \) 3. Am and Betty shared a sum of moncy in the ratio 2:3. Ann received \( \$ 120 \). What was Betty's share? (A) \( \$ 72 \) (B) \( \$ 80 \) (C) \( \$ 180 \) (D) \( \$ 300 \) 4. If \( 12 \frac{1}{2} \% \) of a sum of money is \( \$ 40 \), what is the TOTAL sum of money? (A) S 45 (B) \( \$ 320 \) (C) \( \$ 500 \) (D) \( \$ 4500 \) 5. The value of \( 29.94 \times 0.5 \) is approximately (A) 0.15 (B) 1.5 (C) 15 (D) 150 6 In a schooi, the ratio of the number of pupits to the number of ice chers is 20 . 1 . if the number of pupil is Sto, how many tenchms are West? (A) 40 (B) 42 (C) 300 (D) 840 7. The LARGEST prime number that is less than 100 is (A) 91 (B) 93 (C) 97 (D) 99 8. The H.CF of 12,15 and 60 is (A) 1 (B) 3 (C) 12 (D) 60 9. By the distributive law \( 49 \times 17+49 \times 3= \) (A) \( 52+66 \) (B) \( 52 \times 66 \) (C) \( 49+20 \) (D) \( 49 \times 20 \) 10. The value of the digit 5 in the number 537 is (A) 5 (B) 100 (C) 500 (D) 5000 11. Which of the following sets is equivalent to \( (a, b, c, d) \) ? (A) \( \{4\} \) (B) \( \{a, b, c\} \) (C) \( \{p, q, r, s\} \) (D) \( \{1,2,3,4,5\} \) GO ON TOTHE NEXT PAGE

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Find the area of the parallelogram with vertices at (1, -5), (6, 3), (-10, -2), and (-5, 6). Area =

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Look at the photo for directions The answer to the problem in the picture (P9.8 - 13) is i(t) = (0.25e ^ - 10t - 0.4e ^ - 25t +0.9)A for t >0. 1) Write the differential equation in terms of i(t) and its derivatives. Solve by hand 2)Write circuit equation(s) using Laplace transform. Solve by hand. 3)ldentify the state - space variables and write the set of first - order differential equations in terms of those variables. 80 24.0 i(t) 18V 0.4H v(t) 25mF 12

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3. How many terms of the series $\sum_{n=2}^{\infty} \frac{1}{n \ln^2 n}$ are needed to find an approximation smaller than .001?

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In a population of 100 foxes, 12 are born and 9 die in a given year. Calculate the per capita birth rate? Calculate the per capita death rate.

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Which of the following is not true of a demand curve?

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