Volume 10

A cylindrical airstream was blown across a cylindrical surface. The deflection angle, peak speed, and asymmetry of the airstream were measured while changing the location of the cylinder relative to the center of the wind column, and while changing the speed of the airstream. It was found that the closer the cylinder is to the center of the airstream, the greater the deflection angle, the lower the peak speed, and the greater the asymmetry of the deflected airstream. It was also found that the wind speed has no impact on the deflection angle when the cylinder remains in a fixed position.

The coefficient of restitution (COR) of a bouncing table tennis ball was measured at varying ball temperatures with a Motion Detector. It was found that there is a negative linear relationship between the COR and the temperature of the table tennis ball for temperatures ranging from 5 to 56˚C.

A steel ball was dropped onto the center of a traditional Thai Klong Tad (กลองทัด) drum from different heights. The relationship between the impact energy and the maximum sound intensity produced was examined for heights ranging from 0.23 to 0.59 meters above the drumhead. A proportional relationship was found between the two variables.

A study is presented into the origins of galactic type diversity and galaxy evolution through investigating the relationship between representative galaxy color index u-v and redshifts. A sample of 385,075 galaxies with redshifts 0.2

To investigate the relationship between reed stiffness and sound quality, the same note (concert Bb)was played on an alto saxophone with six different reeds (1.5, 2, 2.5, 3, 3.5, and 4). The relative amplitudes of the first four harmonics for each of the reeds were compared. It was found that the softer reeds had the greater amplitude in upper harmonic intensities. Additionally, it was found that each harmonic followed a general trend, although they did not follow the same trends in relation to one another.

The effect of wind velocity on the cooling rate of water was investigated by blowing air horizontally over the surface of water contained in a plastic water-bottle cap. The time taken for the temperature to fall to the average of the surrounding and initial temperatures was recorded at different values of wind velocity. It was observed that on increasing the wind velocity, the time taken to achieve average temperature not only decreased but also remained the same after a certain point.

The frequency produced by a wooden xylophone, a metallophone and a drum at temperatures ranging from -18˚C to 50˚C was studied. It was found that the frequency of the first two increases, while the drum’s frequency decreases with increasing temperature. Temperature had the greatest effect on the frequency of the xylophone.