Which of the following observations led bohr to formulate his model of the hydrogen atom? which of the following observations led bohr to formulate his model of the hydrogen atom? neutrons form a diffraction pattern when scattered from a nickel crystal. the peak of blackbody radiation moves to shorter wavelengths as temperature increases. a low-density gas emits a series of sharp spectral lines. electrons are observed to have wave nature.

Review multiple-concept example 7 in this chapter as an aid in solving this problem. in a fast-pitch softball game the pitcher is impressive to watch, as she delivers a pitch by rapidly whirling her arm around so that the ball in her hand moves in a circle. in one instance, the radius of the circle is 0.626 m. at one point on this circle, the ball has an angular acceleration of 66.1 rad/s2 and an angular speed of 12.6 rad/s. (a) find the magnitude of the total acceleration (centripetal plus tangential) of the ball. (b) determine the angle of the total acceleration relative to the radial direction.