Birds with average-sized wings survived a severe storm more successfully than with longer or shorter wings. This illustrates `:`

Why is it more difficult to revolve a stone tied to a longer string than a stone tied to a shorter string ?

Why it is more difficult to rotate a stone by tieing it to a longer string than shorter string ?

A student performed the experiment to measure the speed of sound in air using resonance air-column method. Two resonances in the air-column were obtained by lowering the water level. The resonance with the shorter air-column is the first resonance and that with the longer air-column is the second resonance. Then, A. the intensity of the sound heard at the first resonance was more than at the second resonance B. the prongs of the tuning fork were kept in a horizontal plane above the resonance tube C. the ampitude of vibration of the end of the prongs is typically around 1 cm D. the length of the air-column at the first resonance was somewhat than 1//4 th of the wavelength of the sound in air.