Aseries of lines in the spectrum of neutral li atoms rise from combinations of 1s2 2p1 2p with 1s2 nd1 2d and occur at 610.36 nm, 460.29, and 413.23 nm. the d orbitals are hydrogenic. it is known that the 2p term lies at 67.78 nm above the ground state, which is 1s2 2s1 2s. calculate the ionization energy of the ground-state atom.

Brutus, the dog, is pulling a bone to the left with a force of 20 n. lassie, another dog, is pulling a bone to the right with a force of 18n. what is the net force? a. b. c.

What is the temperature in degrees celsius of a substance with a tempature of 49k

At a certain instant after jumping from the airplane a, a skydiver b is in the position shown and has reached a terminal (constant) speed vb = 52 m/s. the airplane has the same constant speed va = 52 m/s, and after a period of level flight is just beginning to follow the circular path shown of radius ρa = 2330 m. (a) determine the velocity and acceleration of the airplane relative to the skydiver. (b) determine the time rate of change of the speed vr of the airplane and the radius of curvature ρr of its path, both as observed by the nonrotating skydiver.