An organ pipe open at both ends has two successive harmonics with frequencies of 210 hz and 240 hz. What is the length of the pipe? the speed of sound is 344 m/s in air.

Anybody wanna ? (picture included? )

Karen is running forward at a speed of 9 m/s. she tosses her sweaty headband backward at a speed of 20 m/s. the speed of the headband, to the nearest whole number relative to a stationary observer watching karen

Imagine you are standing in the antarctic during the southern hemisphere summer. the sky is clear and blue. there are no clouds in the sky. your shadow is cast on the icy ground. what is the color of the shadow?