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1. What percent reduction of the elastic modulus of alumina would be caused by 1% porosity?
2. Pottery is generally ?red at a high temperature; then it is cooled and a glaze is applied. On reheating, the glaze melts and spreads over the surface. On cooling again, residual stresses may develop in the glaze. To ensure that these are compres- sive, what relation is necessary between the properties of the body of the ceramic and of the glaze?
3. Why is there so little concern about thermal shock in metals and polymers, whereas there is much concern with ceramics? Why aren't the parameters R1 = σ f (1 - 2u)/(Eα) and R2 = KIc/(Eα) useful in predicting fracture in metals?
Draw free body diagrams and show coordinate system. Problem 1: An archer shoots an arrow vertically upward. If the arrow ascends to a maximum height of 100 feet.
dry air having a mass flowrate of 2 kgs and a temperature of 300k merges with dry air flowing at 3 kgs and having a
air compressor is a single acting two cylinder unit which takes in an air volume of 0.2 m3s. the initial absolute
a moving particle has coordinates in millimeter which vary with the time t in seconds according to r2t2-4ti 3t2 -t33j
air enters a compressor at 179 kpa and 290 k and exits at a temperature of 500.9 k. determine the power kw for the
a closed rigid tank contains 2 kg of water initially a twophase liquid-vapor mixture at 80degc. heat transfer occurs
a 1x2-in bar is 20 in. long and made of steel with sy 25ksi. with a safety factor of 4 what axial compressive load can
The outer surfaces are exposed to ambient air, with T8,2 = 25°C and h z = 4 W/m2 · K. while hot oil flowing through the hole is characterized by Tx.1 = 300°C and h1 = 50 W/m2 · K. Determine the corresponding heat rate and surface temperatures.
Assume the volume flow rate, Q, over a weir is a function of the upstream water height, h, gravity g, and channel width, b. Use dimensional analysis to find the functional form of the dependence of Q upon the other variables.
gold foil is 0.08 mm thick and 670mm2 in area. a it is cubic with a0.4076nm. how many unit cells are there in the foil?
an insulated and non-conducting tank of volume 1m3 is initially evacuated. it is connected by a valve to supply line
why does a homogeneous isotropic material such as cast iron fail in torsion at 45 degrees while long bone is expected
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