Numerade

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4. Consider a nozzle designed to deliver air from a large tank with stagnation pressure $P_0 = 200$ kPa and stagnation temperature $T_0 = 500$ K. At the nozzle exit the Mach number $Ma = 2.5$ and the mass flowrate is 3 kg/s. Assuming isentropic nozzle flow, calculate the following: (i) throat diameter. (ii) exit pressure. (iii) exit temperature. (iv) exit velocity. (v) exit diameter. The following equations can be used without proof: $\frac{T_0}{T} = 1 + \frac{k-1}{2}Ma^2$ $\frac{P_0}{P} = \left[1 + \frac{k-1}{2}Ma^2\right]^{\frac{k}{k-1}}$ $\dot{m}_{max} = \frac{0.6847P_0A^*}{(RT_0)^{1/2}}$ $\frac{A}{A^*} = \frac{1}{Ma}\left[\frac{2+(k-1)Ma^2}{k+1}\right]^{\frac{(k+1)/2(k-1)}{}}$

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Inthepresence of sounds that are too loud, the vibrations get larger, causing fluid motion in the cochlea that can bend the hair cells to the point of breaking. Hair cells are not replaceable structures. Would you expect hearing damage from exposure to short, intense sounds? What about repeated, continuous exposure to loud noise

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You are trying to alter the membrane potential of the neurons that you are working with in the laboratory. Which of the following would change the membrane potential of your cells?

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1. Set the left MULTIMETER as a VOLTMETER at 20 Volts DC. If you need help with the equipment, go to the 'T' menu to view the equipment tutorials. 2. Set the right MULTIMETER as an AMMETER at 20 mA DC. 3. Set the RESISTANCE to 2,000 0 then press VERIFY RESISTANCE. You will not be able to continue unless the resistance is set to the correct value. 4. Use the circuit diagram to connect the equipment in a complete circuit (roll over the symbols to learn their meaning, pay attention to where the wires split). Once wired, press the VERIFY CIRCUIT button. You will not be able to continue unless your circuit is set up correctly. 5. Turn on the power to the AMMETER, VOLTMETER, and DC POWER, in that order. You will not be able to turn on the equipment if it is not configured correctly. D DATA MULTIMETER A V V Ω COARSE FINE VOLTS AMPS GND MULTIMETER A V V Ω 200μ 2m 20m 200m 2000m 10A MA COM RESISTANCE Ω 002000 + X100K X10K X1K x100 x10 x1 CIRCUIT DIAGRAM V νΩ COM MA A COM R VERIFY RESISTANCE VERIFY CIRCUIT

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Credit cards are one of the early forms of "electronic money''. Briefly summarize the history of the development of credit cards. When did credit cards get into mass circulation? What would change in your life if you didn't have a credit card?

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(b) H C H-C-OH H-C-OH HO-C-H HO-C-H CH$_2$OH (Hint: six-membered ring)

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We need to create a schedule for lectures. However, some students want to atten multiple lectures, so we cannot schedule certain lectures at the same time. These lectures are marked with Xs in the following table. Use graph coloring techniques to answer the following questions. Ast Ch His En Ma Phi Bio ron emi tor glis th los log om stry y h oph y y Astronomy X X X X Chemistry X X X X History X X X X English X X X X Math X Philosophy X X X Biology X X X a. How many periods are needed to timetable all seven lectures? b. Give one of the proper timetables for all the lectures.

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A temperature measurement is made with a thermocouple. The result is shown below. Can you calculate the time constant of the thermocouple?

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Describe the term oligopoly and the role of the government in terms of price regulation in these industries.

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Problem #4: Suppose that the magnetic field in some region has the form $\vec{B} = cos(\phi)\hat{k}$. ( Find the force on a circular loop of radius R lying in the x-y plane that carries a constant current I flowing counter-clockwise.

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