Homework Help: physics

Posted by stephanie on Tuesday, December 4, 2007 at 12:17pm.

A diver can change his rotational inertia by drawing his arms and legs close to his body in the tuck position. After he leaves the diving board (with some unknown angular velocity), he pulls himself into a ball as closely as possible and makes 2.16 complete rotations in 1.31 s. If his rotational inertia decreases by a factor of 2.90 when he goes from the straight to the tuck position, what was his angular velocity when he left the diving board?

physics - Damon, Tuesday, December 4, 2007 at 7:16pm
The thing that stays constant here is the angular momentum which is angular velocity (omega) times rotational inertia (I)

so write:

angular velocity before times rotational inertia before equals angular velocity after times rotational inertia after.
By the way angular velocity is usually expressed in radians per second so you will have to get that from the "after" data of 2.16 rotations in 1.31 seconds.

Answer this Question

Related Questions

physics - A diver in midair has an angular velocity of 6.0 rad/s and a moment of...
Physics - A diver can reduce her moment of inertia by a factor of about 3.5 when...
Physics ang. momentum - A diver can reduce her moment of inertia by a factor of ...
Physics - A diver jumps off a dving board and does a twisting manuever. In the ...
Physics - I think I might be on the right track, if someone could let me know if...
physics - The terminal speed of a sky diver is 157 km/h in the spread-eagle ...
Physics - Rotational Inertia- Particle 1: m=50g x=2 cm y=2 cm P 2: m=25 x=0 y=4 ...
Physics - Suppose that the terminal speed of a particular sky diver is 170 km/h ...
physics (please check work) - Four identical particles, each with mass m, are ...
Physics - Biomedical measurements show that the arms and hands together ...

For Further Reading

First Name:
School Subject:
Answer: