Material Science Engineering Answers

When a pressure vessel has to be mobile its weight becomes important. Aircraft bodies, rocket casings and liquid natural gas containers are examples; they must be light, and at the same time, they must be safe. Therefore, the design of these vessels involves multiple constraints with a single objective.Let us assume you are involved in the selection of materials for the construction of such a pressure vessel. For simplicity, assume that the vessel is spherical and that the radius, R, and the pressure difference,P,across the wall are both fixed by design. Note that the volume of a thin-walled sphere is 4π(R^2)t. During operation, the pressure vessel should not yield,i.e.,the stress in the wall should not exceed 𝜎y. Assume the hoop stress in the wall is (PR)/(2t), where t is the thickness.

A) Derive the materials index, M1, for the design criteria. Start this problem by listing the objective, the constraints and the free variables.

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By using the following data only,evaluate pH2S/p_{H2 in equilibrium with Ag and a maHe conting 90 mol%} Ag₂s at 600c .Assume the gases are ideal and enthalpies are independent of temprature

4Ag_(s)+S_{2(g)___} 2Ag₂S_(s) G_873°=30,750 cal

H_2(g) S₂ H2S cal/k.mol

S₂₉₈^° 31.21 54.4 49.1

H_f^298° 0 31,000 4800 cal/mol

6) A cubic crystal with a=5.60Å is set initially with the incident beam travelling along the [100] direction. The crystal is then rotated clockwise about [001] through an angle ω until the (460) reflection is first produced with Cu Kα radiation. Calculate the Bragg angle θ for the (460) reflection and determine the angle ω

6) A cubic crystal with a=5.60Å is set initially with the incident beam travelling along the [100] direction. The crystal is then rotated clockwise about [001] through an angle ω until the (460) reflection is first produced with Cu Kα radiation. Calculate the Bragg angle θ for the (460) reflection and determine the angle ω

6) A cubic crystal with a=5.60Å is set initially with the incident beam travelling along the [100] direction. The crystal is then rotated clockwise about [001] through an angle ω until the (460) reflection is first produced with Cu Kα radiation. Calculate the Bragg angle θ for the (460) reflection and determine the angle ω

Two impedances Z1 and Z2 are connected in parallel. The first branch takes a leading current of 16 A and has a resistance of 5 Ω, while the second branch takes a lagging current at 0.8pf. The applied voltage is 100+j200 V and the total power is 5 kW. Find branch impedances, total circuit impedance, branch currents and total circuit current.

If the currents in the three parallel branches of an ac circuit are given as I1 = 2530A, I2 = 25e-jΠ/6A and I3 = (50 + j 50)A, express the total current in the form (i) I Φ and (ii) Im sin (ωt + Φ).

Explain the conventional colouring and hatching that represents different materials

A 2 m copper wire with square cross-section of 1 mm by 1 mm stretched 1.51 mm when it  supported a 10 kg mass. Suppose you cut a length of this wire 0.2 m long and hang a 10 kg mass  from it. How much will this shore wire stretch?