Air contained in a cylinder fitted with a piston initially at 2.00 mpa and 2000 °c expands to 0.200 mpa in an isentropic process. assuming the air behaves as a constant specific heat ideal gas, determine the following:
a) the final temperature
b) the change in specific internal energy
c) the change in specific enthalpy
d) the change in specific entropy
e) the work done per lbm of air during the expansion

Which lists the main components of darwin’s theory of evolution? a. random mutations drive evolution; the evolution of a population happens slowly; organisms have common ancestors; organisms do not change. b. natural selection drives evolution; the evolution of a population happens slowly; organisms have common ancestors; organisms change over time. c. natural selection drives evolution; the evolution of a population happens rapidly; organisms have common ancestors; organisms change over time. d. random mutations drive evolution; the evolution of a population happens rapidly; organisms have common ancestors; organisms do not change.

Which object is most likely represented by a dot?

The magnitude of the poynting vector of a planar electromagnetic wave has an average value of 0.939 w/m^2 . the wave is incident upon a rectangular area, 1.5 m by 2.0 m, at right angles. how much total electromagnetic energy falls on the area during 1.0 minute?