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8-90 Steam enters a turbine at 9 MPa, 600 degrees C, and 60 m/s and leaves at 20 kPa and 90 m/s with a moisture content of 5 percent. The turbine is not adequately insulated and it estimated that heat is lost from the turbine at a rate of 220 kW. The power output of the turbine is 4.5 MW. Assuming the surroundings to be at 25 degrees C, determine (a) the reversible power output of the turbine, (b) the exergy destroyed within the turbine, and (c) the second-law efficiency of the turbine. (d) Also, estimate the possible increase in the power output of the turbine if the turbine were perfectly insulated.
The bunchberry flower has the fastest moving parts ever seenin a plant. Initially the stamens are held by the petals in abent position storing elastic energy liked a coiled spring. find the speed of the anther sac as it relases itspollen
A box of books weighing 334 N is shoved across the floor by a force of 479 N exerted downward at an angle of 33° below the horizontal. What is the maximum coefficient of kinetic friction between the box and the floor that allows the box to move with ..
Under atmospheric pressure iron melts at 1530 ºC, and the latent heat of fusion is 1.49 × 104 J / mole. At the melting point, the density of the solid is phase is 7.80 g / cm3, and that of the liquid phase is 7.06 g / cm3. The atomic mass for iron..
A house is 30.0 ft long and 32 ft wide, and has 8.0 ft high ceilings. What is the volume of the interior of the house
A proton is moving toward a wire that carries current in the direction shown. What is the direction of the force on the proton
A beam of laser light (? = 741 nm) hits a black wall and is fully absorbed. what is the total force exerted by the photons on the wall
Two people carry a heavy electric motor by placing it on a light board 1.55 m long. One person lifts at one end with a force of 420 N, Where along the board is its center of gravity located
A baggage handler throws a 20kg suitcase along the floor of an airplane luggage compartment with a speed of 1.2 m/s. What is the suitcase's coefficient of kinetic friction on the floor
a heat engine operates between a hih temp reservoir at 610K and low temp reservoir at 320K. find the net change in entropy as a result of this cycle
a frictionless pulley which can be modeled as a 0.80 solid cylinder with a 0.30 m radius has a rope going over it. The tension in the rope is 10 N on the right side and 12 N on the left side. What is the angular acceleration of the pulley.
An unstable particle is at rest and suddenly breaks up into two fragments. No external forces act on the particle or its fragments. What is the velocity of the more massive fragment
A car that is traveling at 25.0 m/s is 42.5 m away from a wall. what is the magnitude of the cars acceleration
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