Nellie Newton does work on a box by pushing it with a constant force of 100 N over a distance of 4 m. (a) If Nellie pushes the object with twice the force over the same distance, how much work does she do? (b) If she pushes with the original force (100 N) over 8 m how much work does she do?

F500 j of energy were added to 1 kg of each of these samples, which would experience the least temperature increase?

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

What are the factors that affect the resistance of a wire?