Derive the bohr's formula for 7 of a one-electron atom with a nucleus of atomic number z. (recall: (1) v is the energy of the photon emitted (in cm ) when the electron transits from state ny to state nu (ny < n2). (2) a nucleus of atomic number z has z number of protons. (3) since the nucleus is so much nassive than the electron, you can regard the nucleus as being a fixed center around which the electron revolves. in other words, you are not required to consider using the reduced mass concept in this problem.)

Which units can be used to measure length or distance? check all that apply. gram meter kilometer liter inch

Askydiver weighing 140 lb (including equipment) falls vertically downward from an altitude of 19,000 ft and opens the parachute after 18 s of free fall. assume that the force of air resistance, which is directed opposite to the velocity, is of magnitude 0.55|v| when the parachute is closed and is of magnitude 14|v| when the parachute is open, where the velocity v is measured in ft/s. assume that acceleration due to gravity has magnitude 32 ft/s/s; remember that weight is the product of mass and gravitational acceleration. (a) find the speed of the skydiver when the parachute opens. (b) find the distance fallen before the parachute opens. (c) what is the limiting velocity vl after the parachute opens? (d) determine how long the sky diver is in the air after the parachute opens. (e) plot the graph of velocity versus time from the beginning of the fall until the skydiver reaches the ground.

Aball has an initial velocity of 3 m/s. if there is no friction, what is the highest it could roll?