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Mass of 350kg is lifted by 2 cables connecting at the same point right hand cable is at 30 degree angle and left hand cable is at 40 degree angle.
On the oven exterior is 0.88 Btu/h.ft2.0F. A toddler comes by and touches the window. Calculate the temperature of the surface that the child's hand contacts.
A gas is described by v=RT/p - A/T + B, where A and B are constants. For the gas, a.) obtain an expression for the temperatures of the Joule-Thompson inversion states. b.) obtain an expression for c
Determine the required mole fractions of the nitrogen and carbon dioxide to produce this mixture. The speed of sound is given by C=( kRT)1/2.
Air undergoes a polytropic expansion from 25000 R to 15000R. The final pressure of the air is 20 psia and n for the process is 1.32. Determine the work output per pound mass of air.
Show the process on a P-v diagram with respect to saturation lines and determine the amount of liquid at the final state and the total work and heat transfer.
The pressure in the pipe upstream of the nozzle is 500kPa (abs). The upstream temperature is 400K. Estimate the mass flow rate assuming that the discharge coefficient, C, is unity.
What is the temperature at the end of the compression? What is the temperature at the end of expansion? What is the amount of heat supplied to the cycle?
In this cycle steam enters the turbine at 12.5 MPa and 450 deg.C, and saturated liquid at 30 deg.C enters the pump. If the pump efficiency is 85%, what is the thermal efficiency of this cycle?
If the initial temperature of air in the room is 10 degrees celcius determine how long it will take for the air to rise to 20 degrees celcius. Assume constants specific heats at room temperature. an
The rate of the heat output from the heat pump is 200 kW. Calculate the limits imposed by the second law of thermodynamics on the coefficient of performance of the heat pump.
Now the valve is opened and the system is allowed to reach thermal equilibrium with the surroundings, which are at 15°C. Determine the final pressure in the tank.
What is the rate of exergy destruction in this heat exchanger, in units of Btu/s? Assume atmospheric pressure and negligible pressure drop in both fluids, and the environment is 77°F.
Energy is then added to the system by an electric heater until all the liquid is vaporized. The environment is at 100 kPa and 0°C. Calculate the change in exergy of the contents in kJ.
If process is isentropic determine the specific work produced (KJ/kg) b.) if the turbine work is 70% of the isentropic value determine the increase in entropy (KJ/kg-K) between inlet-outlet.
Determine: The number of plates required. 2. The deflection of the spring, and 3. The radius to which the plates must be initially bent. The modulus of elasticity may be taken as 205 kN/mm2.
A flat spiral steel spring is to give a maximum torque of 1500 N-mm for a maximum stress of 1000 MPa. Find the thickness and length of the spring to give three complete turns of motion.
The spring index is 6. Determine the coil wire diameter and number of turns with die following data: Modulus of rigidity = 80 GPa: Modulus of elasticity = 200 GPa: Allowable stress = 500 MPa.
Design a concentric spring for an air craft engine valve to exert a maximum force of 5000 N under a deflection of 40 mm.
The mean diameters of the spring A and B are 100 mm and 70 mm respectively and wire diameters are 13 mm and 8 mm respectively. Find the load taken and the maximum stress in each spring.
If the yield shear stress is 700 MPa and the endurance stress is 350 MPa. Find the size of the spring wire and mean diameter of the spring coil.
Find the maximum shear stress induced in the spring and the amount of compression produced. The modulus of rigidity for the material of the spring wire is 84 kN/mrn2.
The compressor has an isentropic efficiency of 75%. Liquid vapor mixture (x_3= 10%) leaves the condenser at 12 bar. The flow rate of refrigerant 22 is 0.8 kg/s. Determine the compressor power.
Determine the A) compressor power, B) the rate of heat transfer from the working fluid passing through the condenser, C)heat transfer rate from the cooled space to the working fluid
Determine(a) the total velocity of the collar, (b) the total acceleratin of the collar, (c) the relative acceleration of the collar with respect to the arm.