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christina collins

christina c.

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4. In general, materials fracture when the external acting force is greater than the bond strength. (20) 1) Briefly state why fracture usually occurs at a strength much lower than the theoretical strength. (5) 2) Write why most ceramic materials exhibit brittle fracture, whereas most metals exhibit ductile fracture. (5) 3) List and briefly explain two examples of how external stresses or environmental conditions can cause fracture even at stresses below the yield or tensile strength of a typical material.

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12. A culture of bacteria initially has 20 bacteria. t hours later increases at a rate of $\frac{db}{dt} = 3.4657e^{0.1386t}$ bacteria per hour. Find the population size after 8 hours. (round your answer to the nearest bacteria) $t = 8$ $b = 20$ 13. A sample of cesium with an initial mass of 79 mg decays t years later at a rate of $\frac{dc}{dt} = 1.8249e^{-0.0231t}$ mg/year. Find the mass of the sample after 22 years. (round to the nearest decimal place)

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Which one of the following salts, when dissolved in water, produces the solution with the highest pH? O Li$_3$PO$_4$ O KHSO$_4$ O CsClO$_4$ O SrO O KF

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Using Python # Write a program that calculates the product of numbers from 1 to n. Give the n value as an input.

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1 In nature, cytochrome c oxidase normally reduces: a. Water. b. Oxygen. c. Cytochrome c. d. TMPD. e. Carbon monoxide.

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If the citizens of a country want to increase the rate of economic growth, they should focus their efforts on shifting THE LONG RUN / THE SHORT RUN / BOTH aggregate supply curve(s) to the RIGHT / LEFT

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is the long run output the same as the natural rate of output

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1. Plotting the circuit of Figure 2. 2. Follow the steps explaining in the next slides for the simulation configuration. R1 2 C1 3 ww 5000 50mH XFG1 0.5µF XMM2 Agilent Figure 2. XMM1 Problem 2 - Part 2 1. XFG1 is a Function Generator. 2. Make the following changes to the circuit. \(f = 100\text{ Hz}, R_1 = 1\text{ k}\Omega\). Record the values gotten in the multimeters. \(f = 1000\text{ Hz}, L_1 = 100\text{ mH}\). Record the values gotten in the multimeters. \(f = 100\text{ Hz}, R_1 = 250\text{ }\Omega\). Record the values gotten in the multimeters. \(f = 1000\text{ Hz}, R_1 = 25\text{ mH}\). Record the values gotten in the multimeters. 3. Write 2 conclusion for each change in the circuit.

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3. A 3/8-16 UNC Grade 5 bolt has a load of F=5500 lbf. What is the factor of safety for thread stripping, assuming at least 3 threads are engaged? $N_{FS}=$

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9) A concussion wave is moving away from an explosion at a rate of $100 \frac{ft}{sec}$ how fast is the Volume of the sphere growing in t = 5 seconds? Leave $\pi$ in the answer, do not approximate by rounding! Use $V = \frac{4}{3}\pi r^3$ for the volume of a sphere!

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