Question

The tape in a videotape cassette has a total length 191 m and can play for 1.9 h. As the tape starts to play, the full reel has an outer radius of 35 mm and an inner radius of 11 mm. At some point during the play, both reels will have the same angular speed. What is this common angular speed? Answer in units of rad/s.

I received three wrong answers so far:

1.214

1.076

0.068449

Can you please help.

Answer 1