A bacteria culture is known to grow at a rate proportional to the amount present. After one hour, 1000 strands of the bacteria are observed in the culture; and after four hours, 3000 strands. Find an expression for the approximate number of strands of the bacteria present in the culture at t=5 hours. Select the correct response: 6238.36 4326.32 12971 None

A bacteria culture is known to grow at a rate proportional to the amount present. After one hour, 1000 strands of the bacteria are observed in the culture; and after four hours, 3000 strands. Find an expression for the approximate number of strands of the bacteria present in the culture at t=5 hours. Select the correct response: 6238.36 4326.32 12971 None

Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)

8th Edition

ISBN:9781305387102

Author:Kreith, Frank; Manglik, Raj M.

Publisher:Kreith, Frank; Manglik, Raj M.

Chapter1: Basic Modes Of Heat Transfer

Section: Chapter Questions

Problem 1.5P: To determine the thermal conductivity of a structural material, a large 15-cm-thick slab of the...

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A bacteria culture is known to grow at a rate proportional to the amount present. (a) Write down and solve a DE modeling this process. (Your solution will contain two unknown constants.) (b) After one hour, 1000 strands of the bacteria are observed in the culture; and after four hours, 3000 strands. Use this information to complete the determination of the DE. c) Find the approximate number of strands of the bacteria originally in the culture. (d) How long will it take to reach 10,000 strands of the bacteria in the culture.
Suppose it was known that the cell of a given bacterial culture divide every 3.5 hours, if there are 1000 cells in a dish, to begin with, how many will be there be after 12 hours?
a) Separate the rod into 4 control sections, each with a node in the centre, then use finite-volume analysis to estimate the temperature along the length of the rod. b) Separate the rod into 4 sections and repeat (a) with equal both temperature values and beginning conditions using the finite difference method (if necessary). c) Write down and analytically compare with (a) and (b) differential equation for the temperature distribution along the rod. d) Compare the results (a), (b) and (c) by using a graph and differences.e) How to improve the results from (a) and (b)? Show it.
What is the linearity (r-) value of the following concentration and absorbance values: SAMPLE CONCENTRATION ABSORBANCE 1 0.178 0.2127 0.274 0.2715 0.473 0.3892 0.574 0.4568 0.673 0.5327 16 0.864 0.6283 0.9876 0.9976 0.9786 0.9562
The number of contaminating particles on a silicon wafer prior to a certain rinsing process was determ for each wafer in a sample size 100, resulting in the following frequencies: Cumulative Cumulative Number of Particles Frequency Number of Particles Frequency 8 84 3 9. 88 2 6. 10 93 3 18 11 96 4 29 12 97 5 44 13 99 62 14 100 7 72 a) What proportion of the sampled wafers had (P > 5) ? b) What proportion of the sampled wafers had between (4
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nces Mailings Review View Help ntain viruses. Unless you need to edit, it's safer to stay in Protected View. Enable Editing 1 2. 8.1 9 10 1 11 12 1 13 14 T 15 1 16 17 1 1 [8] QUESTION 2 Calculate the length of the resistor of a circular wire used in a heater element connected to a 240V supply and the heater consumes 8 joules of energy in 0,25 seconds. The resistor element is made of aluminium and it has a uniform cross-sectional area with a diameter of 0,00016 inches. Hints: linch = 25,4 mm, resistivity of aluminium = 2,825 x 10-6 Ocm %3D [S] QUESTION 3 A de shunt motor after running for several hours on constant mains of 350 V takes a field current
A thermocouple was used to measure the temperature. Over the range of temperatures expected in the experiment, a linear regression analysis was performed for the temperature as a function of voltage. The best-fit equation was T = (-0.008563 + 220*V), where V is the thermocouple voltage. The voltage was fed into a 11-bit A/D converter with a voltage range of -8 V to 8 V. Determine the measurement resolution (in °C) due to the ADC? O 0.851 None O 3.113 1.710 0.393 4.960 1.144 O 3.797
The concentration of salt ? g/L in homemade soap is given as a function of time as follows: ??/dt = (0.37? − 0.03)? At the initial time, ? = 0 minute, the salt concentration is 20 g/L. Choose a step size in a range of 1 < h ≤ 1.5 minutes for the interval from 0 to 8h minutes and apply THREE (3) numerical methods to compute the salt concentration. Select the best numerical method to estimate the salt concentration and justify your answer. method 1: ruler's method
O True O False QUESTION 3 Compute the expected properties of modulus of elasticity (Ec) of a composite made from S-glass fibers and a Polyester matrix. The volume fraction of fibers is 30%. (Unit is psi.) Properties of Sample Matrix and Filler Materials Tensile strength Tఅబండి Specific weight bai MPa 10 psi GPa Iblin Matrix materials: Polyester Ероху Aluminum 10 18 45 69 124 310 1170 0.40 0.56 10.0 165 2.76 3.86 69 114 0.047 12.7 0.047 12.7 0.100 0.160 27.1 Titanium Filler materials: 170 43.4 S-glass Carbon-PAN Carbon-PAN (high-strength) Carbon (high-modulus) Aramid 600 470 4140 3240 5650 2200 3450 12.5 33.5 40 100 86.2 231 276 690 131 0.09 0.064 24.4 17.4 17.7 820 325 500 0రవ 0.078 0.052 21.2 19.0 14.1 Click Save and Submit to save and submit. Click Save All Answers to save all answers. earch
To determine the thermal conductivity of a structural material, a large 15-cm-thick slab of the material is subjected to a uniform heat flux of 2500 W/m2 while thermocouples embedded in the wall at 2.5 cm. intervals are read over a period of time. After the system had reached equilibrium, an operator recorded the thermocouple readings shown below for two different environmental conditions: Distance from the Surface (cm) Temperature (C) Test 1 0 40 5 65 10 97 15 132 Test 2 0 95 5 130 10 168 15 208 From these data, determine an approximate expression for the thermal conductivity as a function of temperature between 40 and 208C.
Macro farms Ltd can purchase two types of fertilizer which contain the following percentage Nitrate Phosphate Potash Type X 18 5 2 Type Y 3 2 5 For certain type of crop, the following minimum quantities (kg) are required Nitrate Phosphate Potash 100 50 40 Type X cost GHS10 per kg and type Y cost GHS5 per kg. The company currently buys 1,000 kg of each type and wishes to minimize it expenditure on fertilizers.Required 1. What is the minimum expenditure that can be incurred on fertilizer? 2. Find the savings the company can make by switching from it current policy to your recommendation.