An open organ pipe of length 0.5 m and a closed one of length 0.753 m are sounded together. What beat frequency is generated by the first overtone (the harmonic above the fundamental frequency) of the closed pipe with the fundamental frequency of the open pipe

The astronauts on the space shuttle flights experienced an acceleration of 29 m/s2 (about 3 "g's") during lift-off. what upward force must the astronaut's seat apply to the astronaut in order to cause this acceleration? assume the astronaut's mass is 70 kg, and compute this force when the acceleration is near the earth's surface so their weight equals latex: mg m g .