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Briefly explain why porosity decreases the thermal conductivity of ceramic and polymeric materials, rendering them more thermally insulative. (b) Briefly explain how the degree of crystallinity affects the thermal conductivity of polymeric materials and why?
Consider 6.0 kg of austenite containing 0.45 wt% C, cooled to below 727 degrees Celcius (1341 degrees Farenheit).
a seismic instrument has a natural frequency of 20 hz and a damping ratio of 0.65. determine the maximum input
every work producing system results in wasted energy. thermal efficiency gauge sthe conversion of heat to work in a
(a) Determine the blade angles at leading and trailing edges of both the rotor and stator at the mean radii, (b) Calculate the mass flow rate and the power required for each stage.
a crate containing 40 bricks each of mass 1.3kg is placed on a storage framework as shown.a calculate the reaction
water at inlet 1 to a heat exchanger enters the heat exchanger through a circular pipe at a temperature of 200 oc a
a l-shaped bracket lying in a horizontal plane supports a load p as shown. the bracket has a hollow rectangular cross
Calcium oxide (CaO) is formed by decomposing limestone (pure CaCO3). In one kiln the reaction goes to 70% completion. What is the composition (by mass) of the solid product (CaO) withdrawn from the kiln? (Hint: there will be two separate product s..
an electrical device is designed to draw 3.5 amps and operates in a voltage range of 22.0 to 24v. a 18 awg copper wire
a uniform bar ab of mass m 1.00 kg and length l 30.0 cm lies a horizontal plane. an additional mass m 1.00 kg is
The tank has a 180 mm inside diameter and a 12 mm wall thickness. Knowing that the tank contains compressed air under a pressure of 8 MPa, determine the magnitude T of the applied torque for which the maximum normal stress in the tank is 75 MPa.
a 5 ft3 tank containing steam at 14.7 psia 1 quality is fitted with a relief valve. heat is transferred to the tank
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