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A small rotating machine weighing 50 lb runs at a constant speed of 6000 rpm. The machine was installed in a building, and it was discovered that the system was operating at resonance.
Design a retrofit undamped absorber such that the nearest resonance is at least 20% away from the driving frequency.
1 kg of air is polytropically compressed reversibly from 5 bar to 10 bar from an initial temperature of 300°C. Find the transferred heat and the change in entropy. Take the polytropic index as 1.25.
One part of the gauge section has an initial cross-sectional area that is 0.99 times that of the rest of the gauge section. What will be the true strain in the larger area after the smaller area necks and reduces to 50% of its original area?
calculate the number of vacancies per cubic meter in some metal at 689degc. the energy for vacancy formation is 0.75
Determine the friction torque in the bearings, the time taken for the flywheel to come to rest when the driving torque is removed.
a blower handles 1 kgsec of air at 20 deg c and consumes a power of 15 kw. the inlet and outlet velocities of air are
assume that the ends of the bar have been kept at 100 degrees c for a long time. then at some instant call it t0 the
A high-speed boat is powered by a water jet pump engine, similar to a jet engine on airplanes. The engine takes in water at the bow through a tube with diameter 1 ft, and the water is pumped out the stern of the boat through a 3-in diameter tube.
a steam power plant operates on a rankine cycle between pressure limits of 0.08 bar and 80 bar. the heat added by
To defrost ice accumulated on the outer surface of an automobile windshield, warm air is blown over the inner surface of the windshield. Let’s consider the windshield of your car is 5-mm-thick glass. Your car is parked at outside in a cold winter day..
A rigid tank has a volume of 23.3 m^3 and due to safety requirements its pressure should not exceed 105 bar. If the tank has been filled with 1000kg of water vapor and is heated to 360°C check to see if it is within safety requirements.
image text transcribed for accessibility a black thermocouple is used to measure the internal temperature of a furnace
a a rigid tank containing 20 kg of refrigerant 134a as saturated vapor at 1.0 bars and -26.43 c is heated until the
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