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A chromel-alumel thermocouple junction, which can be approximated with a sphere, has an effective diameter of 1 mm. It is used to measure the temperature of a gas flow with an effective heat-transfer coefficient of 500 W/m^2*C. (a) Determine the time constant of this thermocouple. (b) If the gas temperature suddenly increases by 100 C, how long will it take the thermocouple to attain a temperature rise within 1% of the gas temperature rise? (c) Find the answer to the previous questions if the diameter of the bead is doubled. (Assume that the heat-transfer coefficient remains the same)
An ideal vapor-compression refrigeration cycle uses R-134a as the working fluid in an air-conditioning system. The refrigerant enters the compressor as a saturated vapor at 40 °F
Calculate the actual power transmitted to the second pulley and calculate the power which can be transmitted if the maximum tension in the belt is limited to half of the ultimate strength of the belt.
Solve for the dynamics of the resulting system for 20 seconds of real time using midpoint method.
an automobile accelerates from rest at 2.2 ms2 for 24.6 s. the speed is then held constant for 19.8 s after which there
Estimate the temperature of the hottest point in the billet after five minutes of quenching. Neglect end effects; make the calculation for a cylinder of the given diameter but of infinite length.
a shaft is subjected to bending and torsion such that the bending stress on the surface is 80 mpa and the shear stress
A 0.7-lb block rests on top of a 0.5-lb block supported by but not attached to a spring of constant 9 lb/ft. The upper block is suddenly removed. Determine (a) the Maximum velocity reached by the 0.5-lb block, (b) the maximum height reached by the..
a load of lumber of weight w 25 kn is being raised by a mobile crane. knowing the tension is 25 kn in all portions of
Find Max Level Airspeed at 95% RPM and find Max Range Airspeed (VBR) and Max Endurance Airspeed (VBE) - find Max Specific Range and Max Range Airspeed
question a person of weight 100 kg standing on skis 2 m long and 0.10 in wide slides on the 2deg mountain slope at
a new cast iron pipe is 5 km long and 15 mm diameter is used to convey water at a rate of 0.0150m3s-1. given the
an ideal gas of molar mass m is located in a uniform gravitational field whose free fall acceleration is g. a find the
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