Ryan Hart tracked the orbit of dozens of stars in the center of our galaxy to find
out that they were all moving REALLY fast
around a central object that was dark and
very massive. What was at the center of
their orbit?
A microscopic black hole

Another condensed' galaxy

A super massive black hole

A vacuum of space that causes matter to
behave differently

The frequency of a tuning fork can be found by the method shown. a long tube open at both ends is submerged in a beaker of water, and the vibrating tuning fork is placed near the top of the tube. the length l of the air column is adjusted by moving the tube vertically. the sound waves generated by the fork are reinforced when the length of the air column corresponds to one of the resonant frequencies of the tube. the smallest value for l for which a peak occurs in sound intensity is 7 cm. l what is the frequency of the tuning fork? the speed of sound in air is 345 m/s. answer in units of hz