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jay harper

jay h.

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PREGUNTA 1 Se desea fabricar una herramienta de corte para una máquina, como muestra la Figura 1.1, con una resistencia a la tracción aproximada de 1500 MPa, a partir de una barra de acero al carbono de 50 mm de diámetro y de 200 mm de longitud. Para ello se cuenta con los siguientes aceros cuyo estado se suministro es de recocido total: AISI 1035, AISI 1080 y AISI 10100 (ver Figura 1.2). Figura 1.1. Herramienta de corte (medidas dadas en milímetros) Seleccione el acero adecuado y describa los tratamientos térmicos necesarios durante el proceso de fabricación empleando curvas T-t. Se debe señalar las siguientes microestructuras: antes del tratamiento (inicial), justo antes del enfriamiento y después del enfriamiento (final), asimismo compare dos propiedades mecánicas antes y después de realizado el tratamiento térmico correspondiente. Completar el diagrama T-t señalando la temperatura del tratamiento térmico, el tiempo de permanencia en el horno y el medio de enfriamiento necesario. Dureza HRC AISI 1035 AISI 1080 AISI 10100 Temperatura de revenido ($$^{\circ}$$C) Figura 1.2. Curvas de revenido para diferentes aceros al carbono

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Which of the following eye conditions is caused by ageing? Select one (1) correct answer. Question 35Answer a. Conjunctivitis b. Presbyopia c. Retinopathy d. Wet macular degeneration

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Select all sets that 4.$\overline{2}$ belong to. natural numbers whole numbers integers rational numbers irrational numbers real numbers

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Multiple Choice 3 points How many moles of Helium are found in a flask that contains 5.5 L of helium at a pressure of 1.15 atm and a temperature of \( 22.0^{\circ} \mathrm{C} \) ? 2.6 0.26 3.5 3.8 0.35 Multiple Choice 3 points A 3.50 g sample of a diatomic gas in a 1.5 L container has a pressure of 2.42 atm at 355 K . Determine the identity of the gas. \( \mathrm{O}_{2} \) \( \mathrm{N}_{2} \) \( \mathrm{F}_{2} \) \( \mathrm{Cl}_{2} \) \( \mathrm{H}_{2} \)

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3 0.1 points You are a server administrator for your company's private cloud. To provide service to employees, you are instructed to use reliable hard disks in the server to host a virtual environment. Which of the following best describes the reliability of hard drives? ? ALE ? RPO ? MTTR ? MTBF Previous

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Which came first, the chicken or the egg?" This question seeks to address the common fallacy of ________ in the context of correlation and causation. Group of answer choices comparative analysis linear relationships omitted variables reverse causality

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Which of the following is recommended by your textbook for effective online speaking? Multiple Choice Make frequent pauses to keep the speech from moving too fast. Know your technology thoroughly so you can use it effortlessly. Speak with your back to a window so there is plenty of light. Avoid referring to the audience because they are not physically present. Exaggerate your gestures so they'll be visible to the audience.

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Find the absolute maximum and absolute minimum values of the function \(f(x) = x(x-4)^3\) on the interval \([0,3]\).

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Equations \cdot torque = force \cdot distance \cdot linear power = \frac{force \cdot distance}{time} \cdot rotational power = torque \cdot RPM \cdot \frac{2\pi}{60} \cdot Gear ratio for single pair of gears: \qquad ratio = \frac{\# driven teeth}{\# driving teeth} = \frac{N_2}{N_1} \cdot Gear ratio for a 2-stage gearbox: \qquad ratio = \left(\frac{N_2}{N_1}\right) \cdot \left(\frac{N_4}{N_3}\right) \cdot Gearbox output speed: \qquad speed_{out} = \frac{speed_{in}}{ratio} \cdot Gearbox output torque: \qquad torque_{out} = torque_{in} \cdot ratio \cdot efficiency \cdot Tooth stress (V in ft/min, P_d is the pitch, not the pitch diameter) \qquad \sigma = \frac{W \cdot P_d}{Y \cdot F} \cdot \frac{1200 + V}{1200}

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Problem 1 (25 points) A permanent magnet synchronous motor (PMSM) is supporting a load torque of 15 N-m clockwise. At t=0, the rotor magnetic axis is at -30°. The motor torque constant is $K_t$=0.5. Calculate $i_a$, $i_b$, $i_c$ at t=0.

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