Mechanical Engineering Answers

Find c_v and c_p for a certain fluid if the properties are related as follows: u = (196 + 0.718t) KJ/kg_m and pv = [0.287(t^oc + 273)] where v is in m³/kg_m and p is in KN/m².

For cretain ideal gas, R = 0.32 KJ/kg_m - K and c_p = 1160 J/kg_m- K. (a) Find c_v and k. (b) If 6 kg_m of this gas undergo a reversible nonflows constant pressure process from V₁ = 2.1 cu. m, p₁ = 0.7 MPaa to a state where T₂ = 830 K, find ▲H, ▲U, and Q and W.

A 60 kg_m body has a potential energy of 135 Kcal with respect to a datum plane X and a potentiaal energy of -99 Kcal with respect to datum plane Y. If the local acceleration of gravity is standard, compute the relative position of plane X relative to plane Y. Resolve the problem if g = fps².

A closed system undergoes a frictionless process from 200 psia and 3 ft³ during which the product pV^1.3 remains constant. How much work does the system do if the final pressure is 40 psia?

A piston-cylinder arrangement contains a gas at P₁ = 600 KPa, V₁ = 0.10m³ and expand to V₂ = 0.5 m³. Compute the work done by the gas if the process follows the relation (a) pV^1.4 = c, and (b) p = -300V + 630, where p is in KPa and V in m³.

A certain fluid in a closed system initially at a pressure of 200 psia and having a volume of 3 ft³ undergoes a frictionless process during which the product pV^1.3 = C. If p₂ = 40 psia, compute the work done by or on the system.

Determine the work done by a 1 Kg_m fluid system as it expand slowly in a closed system from P₁ = Mpa, V₁ = 0.08 m³ to V₂ = 0.22 m³ in accordance to the defining relations: (a) p = c, (b) pV = c, (c) pV³ = c, (d) pV (lnV) = c and (e) pV^1.4 = c. Express your answer in calories.

A fluid at a pressure of 3 bar and specific volume of 0.18 m³/kg_m contained in a piston cylinder arrangement expands reversibly to a pressure of 0.6 bar according to relation p = c/v² where c is constant. Compute the work done in cal/kg_m by fluid on the piston.

A twisted steel wire of length L,cross sectional area A and modulus of elasticity E in tension . The wire is stretched horizontally between two fixed points A and B but without any initial tension . A load P is then suspended from the mid -pointC of the wire .find the vertical deflection of the mid-point C of the wire . assume that the deflection is small compared to the length of the wire.

The food compartment of a refrigerator, is maintained at 4°C by

removing heat from it at a rate of 360 kJ/min. If the required power input

to the refrigerator is 2 kW, determine (a) the coefficient of performance of

the refrigerator and (b) the rate of heat rejection to the room that houses

the refrigerator.