Two cellos are being played in a duet. At a certain point, one cello plays a note of frequency 148 Hz and the other plays a note of frequency 167 Hz. Does the audience hear a beat, and if so, at what frequency?

Yes, at frequency 0.053 Hz

Yes, at frequency 19 Hz

Yes, at frequency 9 Hz

A beat is not heard.

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 .