Question 1: Which of the following are material properties? O Young modulus O Electrical resistance. O Melting temperature O Density O Weight Question 2: How many independent components are in the stress tensor generally? 03 09 06 01
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- 2. What is the equivalent stiffness of the system of Fig. 1-19 using the displacement of the block as the generalized coordinate? E = 210 x 10 x 10ʻ N 1= 1.5 x 10 mª 2.5 m 2 x 10 N 3 x 10 N Fig. 1-19 Answer: 4,690,000 N/MQ1- Explain diasram. Stress Strain and mechanical properties of meterials Discuss partial industrial with Talk 042-73023y RILAL TRADERA Shanghai Plaz Collage Road Rawaipindi. Tai051-5530389shear stress at the plate boundary and at y = 0.15 m from the plate. [Ans. 1.20 N/m², 1.08 N/m²]
- A bullet is to be tested in the laboratory to determine the drag force on it. Dependent parameter the drag force D (Newton) depends on the velocity of the bullet V(m/s), the length of the bullet L(m), sound velocity c(m/s), density of fluid ρ (kg/m3) and dynamic viscosity µ(kg/ms). Solve the problem by making the necessary assumptions and drawing the schematic figure. I-Determine the nondimensional p parameters using repeating variables ii-a bullet with a speed of 96,2 m/s in air may be modelled in a water tunnel with a test section velocity of 262 cm/s. Determine the length of the model, if the length of the bullet is 56,2 mm. The air and water temperature is 20 oC degree at 1 atm. iii- if the drag force on the model is measured to be 2,62 N, then determine the expected drag force on the bullet. Comment on dynamic similarity equivalence?The graph shown below shows the Modulus of Elasticity (E) of different materials with respect to temperature (°C). 240 210 170 140 100 -Carbon Steel, C < 0.3% -Nickel Steels, Ni 2% - 9% 70 Cr-Mo Steels, Cr 2%-3% Copper -Leaded Ni-Bronze -Nickel Alloys - Monel 400 35 -Titanium rengineeringtoolbox.com -Aluminium -300 -200 -100 100 300 400 500 600 700 800 Temperature (degc) a) Which material is the most ductile with increasing temperature? b) Which material is the least ductile with increasing temperature? c) Discuss the change in ductility (brittle / ductile behavior) occurring for different materials. Also, comment on why Young's modulus changes with temperature. E-modulus of elasticity (GPa)The thermal conductivity of fibreglass insulation at 67F is 0.02 Btu/h ft F. What is its value in SI units?
- Given the stress tensor: Find: 3 36 27 0 σ = 27-36 00 0 18 (a) The components of the traction (force per unit area) acting on a plane with unit normal n= 2 21 3 3'3 T (b) The component of the traction in the direction of the normal (c) The angle between the traction and the normal vector (d) The magnitude of the traction vector (e) The net force acting on a cube with corners at (x,y,z)=(±1,±1,±1)3. Thermal conductivity of a substance is measured as k = k, TIT, . Find an average value for thermal conductivity in the temperature range of T1 and T2. [Ans. = (k, /272 xT} 2 – T}/2) (T2 – T;) 1|How much heat is absorbed by a 27.0 g sample of water in going from liquid at 38.2 °C to steam at 119 °C and a pressure of 1.00 atm? Use the data in the following table. Express your answer in kilojoules. Pay attention to units! Some Thermal Properties of Water Property Specific heat (J/g °C) Solid Liquid Gas AHfusion (kJ/mol; at 0 °C) A Hvaporization (kJ/mol; at 100 °C) A Hsublimation (kJ/mol) Melting point (°C) Boiling point (°C) Answer: Value 2.07 4.18 2.01 6.01 40.6 50.9 0 100
- Henri Darcy, a French engineer, proposed that the pressuredrop ∆ p for fl ow at velocity V through a tube of length Lcould be correlated in the form ∆p ___________ = α LV2 ρ If Darcy’s formulation is consistent, what are the dimensionsof the coefficient α ?Required information Determine the dimension {MLT} of the following quantities: ?u pu əxvalg, (21535mm 1.15 The pressure difference, Ap, across a partial blockage in an artery (called a stenosis) is approximated by the equation μV Ap - K. 4 + K.(A-1) pv² = K₂ A s.r to zogy nish190 32\V as bonb dignol a 3 basiy noft where V is the blood velocity, u the blood viscosity (FL-2T), p the blood density (ML), D the artery diameter, Ao the area of the unobstructed artery, and A, the area of the stenosis. Determine the dimensions of the constants K, and K. Would this equation be valid in any system of units?