Engineering Answers

Two (2) kg of an ideal gas at 1atm and 300C is placed inside a piston cylinder assembly. Heat was then applied allowing the piston to expand at constant pressure. If the gas has Cp of 1.35kJ/kg-K and Cv of 1.09kJ/kg-K, determine the work done by the gas (kJ) as it is heated to a temperature of 1000C. Determine also the final volume of the gas after expansion (m3).

A one meter of annealed copper 2.5 cm in diameter is drawn until its resistance is 100 times the initial resistance, its diameter afterward is?

(a) Derive the formula for elastic potential energy, PEE, in terms of applied force F, stiffness

constant k, and extension ΔL of a wire. State any assumptions made.

(b) Figure 4.6a shows a F versus ΔL graph for a wire of length 2.0 m and diameter 1.2 mm.

(i) Determine the stiffness constant of the wire from the graph.

(ii) Determine the Young’s modulus for the material of the wire.

(iii)What is a practical advantage of knowing the Young’s modulus as compared with the

stiffness constant of the wire?

A Civil Engineer proceeded to do the stadia survey work to determine the topography of a certain area. The transit was set up at a point A, with the line of sight horizontal, took rod readings from the rods placed at B and C which is 200 m and 60 m from A respectively. 

what is the total interior angle at point c of the following azimuth are given AzimS(A-B)=577 degrees AzimN(C-A)=597 degrees

A current of 90 A is shared by three resistances in parallel. The wires are of the

same material and have their lengths in the ratio 2: 3: 4 and their cross-sectional areas

in the ratio 1: 2: 3. Determine current in each resistance

name at least 4 typical environmental problems you observed as a whole which has a big impact on society's well-being. briefly discuss how these affect you as an individual and a civil engineering student.

As ahown in the figure find that at what distance body A will attain a velocity of 3 m/s.when starts from the rest.Asaume coefficient of friction is 0.2for blocks and surface and pulleys are weightless and frictionless

A.        What is meant by the term: atomic structure?

B.       State Pauli's Exclusion principle

C.          Write the electronic configuration for the following:

         Neon [Ne - 10]

Argon [Ar - 18]

D.  Sodium chloride (NaCl) exhibits predominantly ionic bonding. The [Na - 11]+ and [Cl — 17]- ions have electron structures that are identical to which two inert gases?

E. Clearly show that the atomic packing factor of face-centred cubic structure is 0.74.

Calculate the radius of a barium atom, given that Ba has a BCC crystal structure, a density of 3.6.g/cm³ and an atomic weight of 137 g/mol.

List the THREE (3) classification ofthe imperfections and THREE (3) defects in solids.

D.                Which properties of material would you need to consider if you required materials which were:

Capable of being bent into a fixed shape, iii. Capable Of not fracturing when small cracks are present, iv. Not easily broken

v. Act as electrical insulator vi. A good conductor of heat vii. Capable of being used as the lining for a tank storing acid.

E.                 List the TWO (2) applications of the following materials:

i. Plain Carbon steel 0.3 % Carbon ii. Medium Carbon Steel 0.7 Carbon iii. High Carbon Steel 0.9 — 1.5% Carbon iv. Stainless steel Cast Iron vi. Wrought iron