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The engine produces 75 kW of power and rejects heat into the cold reservoir at a rate of 9 kW. (a) Find the efficiency of the heat engine, (b) Is the engine reversible?
A heat engine of 30% thermal efficiency drives a refrigerator having a coefficient of performance of 4. Determine the ratio of the heat input to the engine to the heat remove from the cold body by
Consider a waterfall having a drop of 84.7m. (a) Determine the specific potential energy (J/kg) of the water at the top of the falls with respect to the base of the falls.
The work input to a steady flow water pump is 4500 J/kg, with the water entering the pump at 1 bar and 30C. Determine the exit pressure if the fluid temperature increases by 0.1 C during the process.
Determine the capacity of the steam-generating unit in MW using the expression of steady state, steady flow conservation of energy.
Write an expression for the heat transfer rate per unit length, Q/L, between the pipe surface temperature and the outer insulation surface temperature.
What is the tolerable tensile load, in N, to avoid catastrophic failure? The panel is 200 mm in width, 2 mm in thickness. The geometry correction factor is 1.0 for internal cracks, 1.1 for surface c
The mass flow rate is 0.1 kg/s. If the compressor power input is 77 kW, determine the rate of heat transfer between the compressor and its surroundings, in kW. Neglect kinetic and potential energy e
If the process is isentropic determine the exit pressure in kPa. Also, determine the exit pressure if the fluid temperature increases by 0.1 C during the process.
Find: a) the net actual work, b) the isentropic efficiency of the turbine, c) the ideal Rankine thermal efficiency, d) the actual Rankine thermal efficiency, and e) the relative efficiency.
The inlet temperature is 25 C and it exhausts to the room at 100 kPa. What is the necessary inlet pressure and the exhaust temperature of the air? Assume the turbine is adiabatic and air has constan
What is the nozzle inlet pressure and temperature. Assume the inlet kinetic energy is negligible and assume the specific heats are constant at the 300 K value.
Assuming the compressor is adiabatic and that the isentropic efficiency of the compressor is 70% determine the exit pressure and the power input required to drive the compressor. Account for variabl
How long after the snap until the cart has a velocity of 30 ft/s down the incline? the cart has a mass of 500 kg and the coefficient of friction is .5.
Two states of water (H2O) are given as: Initial state: 25C, 100 kPa Final state: ideal gas at 1800C Determine the change in specific enthalpy and specific internal energy.
Air with a volume of 0.5 m3 under the piston is heated so that the piston moves up. Find the total heat transfer to the air when the piston has been pushed up to the top end of the cylinder.
A fatigue test is made with a mean stress of 17,500 psi (120 Mpa) and a stress amplitude of 24,000 psi (165 Mpa). Calculate (a) the maximum and minimum stresses.
What is the efficiency of the turbine and the entropy generated per kilogram of steam? d) if the ambient temp is 25C and the ambient pressure is 1 bar.
A sphere is moving with speed v as shown, and it impacts the inclined face of a wedge. Determine the wedge angle, theta, as a function of L and e, the sphere's coefficient of restitution.
The other sample has a bit of dislocations. Which of the two samples would you expect is more likely to shatter when hit with a hammer? why?
Water flows through a horizontal section of 5cm diameter pipe. The pressure drop over 10m is 4kpa. What is the head loss coefficient k, and what is the Darcey-Weisbach coefficient?
Hollow cylindrical steel torsion bar of length 1.5 m, outside diameter 30 mm and inside diameter 24 mm is clamped at one end and the other end is twisted through an angle of 10 degrees.
At this point, a miner of mass 100 kg gets into the cage. How much further will the cage descend as he gets in, assuming there is no brake to prevent this motion.
If you were to heat a 30 at% Ni, composition, a 50 at% Ni composition, and an 80 at% Ni composition from 600oC, at what temperature would the first liquid form for each composition?
In a system a lever needs and effort of 200N to lift a load of 350N.the end of the lever arm moves 50cm and the load moves 20cm.