In a hurricane, air moves along the ocean surface into the eye of the hurricane. at the eyewall the temperature is still t2=303k but the pressure has dropped to p2=0.900bars . in addition, near the eyewall the air becomes saturated with water, and each kilogram of air contains about 28 grams of liquid water. this water evaporates when heat is adsorbed from the ocean at t2=303k. calculate δs2, the entropy change in moving 1.00 kilogram of air from the reference state to the eyewall. include both the entropy increase from the pressure change of the air and from the water evaporation. assume for water at t=303k δhvap=45.0kjmol−1

Aman pushes on a trunk with a force of 250 newtons. the trunk does not move. how much positive work is done on the trunk? 0.0 j -250 j 250 j 125 j

Consider the particle-in-a-box problem in 1d. a particle with mass m is confined to move freely between two hard walls situated at x = 0 and x = l. the potential energy function is given as (a) describe the boundary conditions that must be satisfied by the wavefunctions ψ(x) (such as energy eigenfunctions). (b) solve the schr¨odinger’s equation and by using the boundary conditions of part (a) find all energy eigenfunctions, ψn(x), and the corresponding energies, en. (c) what are the allowed values of the quantum number n above? how did you decide on that? (d) what is the de broglie wavelength for the ground state? (e) sketch a plot of the lowest 3 levels’ wavefunctions (ψn(x) vs x). don’t forget to mark the positions of the walls on the graphs. (f) in a transition between the energy levels above, which transition produces the longest wavelength λ for the emitted photon? what is the corresponding wavele

An initially unpolarized light if intensity 500 w/m^2 passes through four polarizers. the transmission axis between adjacent polarizers is 45∘. what percentage of the initial intensity is transmitted by the system?