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Steam enters a turbine steadily at 3 MPa and 450°C at a rate of 8 kg/s and exits at 0.2 MPa and 150°C. The steam is losing heat to the surrounding air at 100 kPa and 25°C at a rate of 300 kW, and the kinetic and potential energy changes are negligible. Determine (a) the actual power output, (b) the maximum possible power output, (c) the second-law efficiency, (d) the exergy destroyed, and (e) the exergy of the steam at the inlet conditions.
Suppose a manufacturing plant has an average sound intensity level of 97.0 dB created by 25 identical machines. Find the sound intensity created by one such machine
The radius of a circle is measured to be (17.4 ± 0.7) m. Calculate each of the following and give the uncertainty in each value. Be sure to use the right number of significant figures. Calculate the circumference of the circle
a 310 g- paperback book rests on a 1200 g -textbook. a force is applied to the textbook and the two books accelerate
A high-pressure gas cylinder contains 40.0 L of toxic gas at a pressure of 1.70 ? 107 N/m2 and a temperature of 18.0°C. What is the final pressure in the tank, assuming a negligible amount of gas leaks while being cooled
The spin dynamics in most spin-ice materials is very classical and has little quantum fluctuations. So the question is that which spin-ice materials have strong quantum fluctuations? What are the model Hamiltonian for the spins in those materials?..
A helium nucleus contains two protons. What is the approximate magnitude of the electric force between these two protons
Halley's comet moves about the Sun in an elliptical orbit, with its closest approach to the Sun being 0.59 A.U. what is its speed when it is farthest from the Sun
The mean distance between the Earth and Sun is 149.6 x 10^6 kilometer. Find the earth linear velocity and angular velocity as it rotates around the sun
If engine works between a hot reservoir at 640 K and acold reservoir at 320K. What is the maximum efficiency of the engine
The helicopter can produce a maximum downward air speed v = 24m/s in a slipstream of diameter D = 9 m. Knowing that the weight of the helicopter and crew is 15 kN and assuming air density ρ= 1.21 kg/m3 , determine the maximum load that helicopter ..
A pine cone falls from a tall tree. It takes 0.2 seconds to pass by a 2 meter tall window, i.e.the time between when it' s visible at the top of the window, How high above the window was it at its starting point
Estimate the average velocity of car
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