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1. Helium is compressed isothermally from 121 kPa(abs) to 301 kPa(abs). Determine the entropy change associated with this process.
2. Air at 14.7 psia and 70 °F is compressed adiabatically by a centrifugal compressor to a pressure of 100 psia. What is the minimum temperature rise possible? Explain.
We have seen that derivatives of partition functions can be used to express various quantities of interest. Derive identities for the following in terms of derivatives of the quantum-mechanical, grand canonical partition function.
A 4 m diameter sphere is embedded in insulation. The sphere contains a liquid-ice mixture maintained at 0 deg C. The ambient temperature surrounding the insulation is 25 deg C.
For a price of $165/ton of ammonia, estimate the time required to regain the capital investment in the OTEC production plant and compare your estimate with the claim that the capital could be repaid in 2.5 years.
consider a large vessel divided into two chambers by a dividing nwall such as that described in lecture on 23 feb. the
It is claimed that a refrigerator requiring 400 W of power (W) receives heat from cold storage (low temperature source, TL) at 200 K and rejects heat at the rate of 600 W (QH) to an environment at 600 K (high temperature reservoir, TH). Calculate the..
To make strawberry jam, crushed strawberries and sugar are mixed in a 45:55 mass ratio, and the mixture is heated to evaporate water until the residue contains one-third water by mass. Calculate how many pounds of strawberries are needed to make a..
consider the belt and pulley system the pulley radius is 0.09 m and the motor inertia is jm 0.01 kgm2. calculate the
determine (a) the propagation, attenuation, and phase constants, (b) the phase velocity, (c) the wavelength, (d) the intrinsic impedance, (e) the skin depth, and (f) the average power density. If the range is considered to be the distance at which..
Piston-cylinder assembly contains 3 kg of steam at pressure of 100 bar and temp of 400 C. It undergoes a process by which it expands against a constant pressure of 20 bar, until the forces balance. The piston generates 748,740 J of work. Water is not..
the shaft consists of two sections with 8.5 knm of torque applied clockwise at the joint. the left steel section has a
The gutter is designed for a sudden rainstorm of up to 5 inches per hour. For this condition, what is the maximum roof area that can be drained successfully?
refrigerant 134a at 1mpa and 90 degrees c is to be cooled to 1 mpa and 30 degrees c in a condenser by air. the air
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