10 research outputs found
Modeling Pitch Trajectories in Fastpitch Softball
The fourth-order Runge–Kutta method is used to numerically integrate the equations of motion for a fastpitch softball pitch and to create a model from which the trajectories of drop balls, rise balls and curve balls can be computed and displayed. By requiring these pitches to pass through the strike zone, and by assuming specific values for the initial speed, launch angle and height of each pitch, an upper limit on the lift coefficient can be predicted which agrees with experimental data. This approach also predicts the launch angles necessary to put rise balls, drop balls and curve balls in the strike zone, as well as a value of the drag coefficient that agrees with experimental data. Finally, Adair’s analysis of a batter’s swing is used to compare pitches that look similar to a batter starting her swing, yet which diverge before reaching the home plate, to predict when she is likely to miss or foul the ball
Two Examples of Circular Motion for Introductory Courses in Relativity
The circular twin paradox and Thomas Precession are presented in a way that
makes both accessible to students in introductory relativity courses. Both are
discussed by examining what happens during travel around a polygon and then in
the limit as the polygon tends to a circle. Since relativistic predictions
based on these examples can be verified in experiments with macroscopic objects
such as atomic clocks and the gyroscopes on Gravity Probe B, they are
particularly convincing to introductory students.Comment: Accepted by the American Journal of Physics This version includes
revision
Zur architektonischen Gestaltung von Zuhoereraeumen in warm-trockenen Klimaten unter Beruecksichtigung raumakustischer Bedingungen
Published in two volumesSIGLEAvailable from TIB Hannover: DW 5944 / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekDEGerman