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Consider fine and coarse powders of the same chemical composition. During sintering of the powders a fine powder compact showed abnormal grain growth while a coarse powder compact showed normal grain growth. Explain why the grain growth behaviour was different between the two powders.
a rigid tank initially contains 3 kg of air at 500 kpa 290 k. the tank is connected by a valve to a piston-cylinder
a fire hose needs to deliver 25 ls of water to a maximum height of 50 m above ground level. a find the stagnation
determine the fourier coefficients a0 an bn and the trigonometric fourier series for the function yt at where the
a six cylinder four stroke spark ignition engine operating on the ideal otto cycle takes in air at 1 atm and 18 oc and
A punch press, used for stamping sheet metal, has a punching capacity of 50 kN. The section ofthe frame is as shown in Fig. Find the resultant stress at the inner and outer fibre of the section.
5ft3 of ammonia is initially at 100 psi and a specific volume of 0.024ft3/lbm is heated or cooled to make this an isothermal process until half of the mass is gas and the remaining is liquid. At what temperature does this process occur and how much w..
An air conditioner can produce a 120 kJ/min cooling effect while rejecting 2.5kW of heat. What is its COP and the electricity it consumes? An inventor claims to have designed a system which can produce the same cooling rate but consumes only 0.05kW e..
A solid block of wood weighs 62290 N/m^3. It is in a shape of rectangular parallelepiped having a 10 cm square base.If the boat floats in fresh water with the square base horizontal, what is its maximum height for stable equilibrium in upright positi..
A spring stiffness k= 500 n/m is mounted against a 10 kg block. if the block is subjected to a force of 1 KN determine the velocity of the block at s=0.3 m when s=0, the block is at rest and the spring is uncompressed. The coefficient of fricktion is..
For a laminar flow between two parallel plates shown figure below, obtain an expression for the pressure drop and velocity profile. Also, obtain an expression for Frictional dissipation and the friction factor.
Determine the heat transport rate of energy through an animal skull where average inside surface temperature is 95 degrees farinhiet and whose out outside surface temperature is 90 F. Assume the skull is a spherical shell 7.5 inches in outside dia..
a particle at rest is located at point 325 with units of ft. it is subjected to an acceleration in units of fts2 of a
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