Circular fins of uniform cross section, with diameter of 10 mm and length of 50 mm, are attached to a wall with surface tem perature of 350°c. the fins are made of material with thermal conductivity of 240 w/m k, and they are exposed to an ambient air condition of 25°c and the convection heat transfer coefficient is 250 w/m2-k. determine the temperature at the middle of the fin for infinitely long fin.

Steel is coated with a thin layer of ceramic to protect against corrosion. what do you expect to happen to the coating when the temperature of the steel is increased significantly? explain.

How to increase the thermal officiency of an ideal simple rankino cycle? among these methods, which one is the best and why?

Tom is having a problem with his washing machine. he notices that the machine vibrates violently at a frequency of 1500 rpm due to an unknown rotating unbalance. the machine is mounted on 4 springs each having a stiffness of 10 kn/m. tom wishes to add an undamped vibration absorber attached by a spring under the machine the machine working frequency ranges between 800 rpm to 2000 rpm and its total mass while loaded is assumed to be 80 kg a) what should be the mass of the absorber added to the machine so that the natural frequency falls outside the working range? b) after a first trial of an absorber using a mass of 35 kg, the amplitude of the oscillation was found to be 10 cm. what is the value of the rotating unbalance? c) using me-3.5 kg. m, find the optimal absorber (by minimizing its mass). what would be the amplitude of the oscillation of the absorber?