Take as a a trial function for the ground state of the hydrogen atom

(a) e−kr,
(b) e−kr2 and use the variational principle to find the optimal value of k in each case. Identify the better wavefunction. The only part of the laplacian that need be considered is the part that involves radial derivatives.

How are the crust and the inner core alike? a) they are both solid. b) they both have the same temperature. c) they are both under the same pressure. d) they are both very close to the center of the earth.

Discuss how the hardness or softness of the landing surface is related to the time required to stop the egg

Amoving company collects data about couches they move and displays the data in a table. the force along the ramp, the angle of the ramp, and the height the couch is raised to are shown. which statements correctly compare the work done to move the couches? check all that apply. the same amount of work is done for couches 1 and 3. the same amount of work is done for couches 2 and 3. the work for couch 1 is greater than the work for couch 2. the work for couch 2 is less than the work for couch 3. the work for couch 3 is greater than the work for couch 1. the work for couch 2 is greater than the work for couch 1.