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Helical symmetry A particle moves in a conservative field whose potential energy V has helical symmetry. This means that V is invariant under the simultaneous operations (i) a rotation through any angle α about the axis Oz, and (ii) a translation cα in the z-direction. What conservation principle corresponds to this symmetry?
air is compressed in a steady-flow compressor entering at 1.2 bar and 300 k and leaving at 5 bar and 500 k. operation
a coal-fired power plant uses a large lake for its cooling needs. the power plant output is 300.0 mw. if the plant uses
air with natural convectionno flow 20 degree c surrounds a flat plate. the plate is 100cm long 50cm wide and 2cm
Considering all the fillets, compute the hydraulic radius for the passage, and then compute the volume flow rate of acetone at 77°F required to produce a Reynolds number for the flow of 2.6 X 104.
Use the finite-difference method of solution to obtain qf when the convection and radiation coefficients are based on local, rather than average, tem- peratures for the fin. How does your result compare with the analytical solution of part (a)?
State the definition of the Z transform.
steam expands isentropically from 2 mpa and 500 k to a final state in which the quality is 0.90. determine the final
Steam enters an adiabatic turbine steadily at 4.5 MPa and 450°C at a rate of 10 kg/s and exits at 450 kPa and 150°C. If the environment is at 100 kPa and 25°C, calculate the exergy of the steam at the inlet and the exit conditions.
The diffusion coefficient for Cr+3 in Cr2O3 is 6E-15 cm2/s at 727 C and is 1 E -9 cm2/s at 1400 C. Determine the activation energy and the constant Do
given a rectangular sample of ductile iron 60-40-18 with cross sectional dimensions 0.8 in x4 in calculate the stress
0.25 kg of red-hot 700 c coals are taken from the fireplace and left in the middle of a room. the room is 3 m x 4 m x
Complete a thermodynamic analysis of the system using the approximation of constant specific heats. Determine T5, T6, T7, m·2, and Q·int (the internal heat transferred within the heat exchanger)
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