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Spinning Tops With String Question

Laura asks…

Physics webassign, rotational kinematics. Need help!?

A top is a toy that is made to spin on its pointed end by pulling on a string wrapped around the body of the top. The string has a length of 76 cm and is wound around the top at a spot where its radius is 2.3 cm. The thickness of the string is negligible. The top is initially at rest. Someone pulls the free end of the string, thereby unwinding it and giving the top an angular acceleration of 11 rad/s2. What is the final angular velocity of the top when the string is completely unwound?

At the local swimming hole, a favorite trick is to run horizontally off a cliff that is 5.3 m above the water. One diver runs off the edge of the cliff, tucks into a “ball,” and rotates on the way down with an average angular speed of 1.8 rev/s. Ignore air resistance and determine the number of revolutions she makes while on the way down.

A gymnast is performing a floor routine. In a tumbling run she spins through the air, increasing her angular velocity from 3.00 to 5.25 rev/s while rotating through three-fourths of a revolution. How much time does this maneuver take?

A dentist causes the bit of a high-speed drill to accelerate from an angular speed of 1.45 104 rad/s to an angular speed of 3.14 104 rad/s. In the process, the bit turns through 1.96 104 rad. Assuming a constant angular acceleration, how long would it take the bit to reach its maximum speed of 7.85 104 rad/s, starting from rest?

scottparat answers:

1)ans:76/2*pi*2.3 = 5.26rad/sec

i have to go now so pls satisfy with first ans

Steven asks…

What are some of your favorite gamestoys and why?

One of my favorite games is called “Battling tops” by Ideal games. This game can have from 2 to 4 players and it’s for “Ages 4 and up” In this game you wrap a string around your top and then put off the string and off it goes with another top or tops as they shoot forward into the arena and knocking each other around and the last one standing or spinning around wins. Sometimes the tops lose by literally flying out of the arena.

I like it because it is fast and to me exciting. I like the sound that the tops make and their “aggressive fighting” with each other. Also this game is like no other that I know of. And I win a lot in this game (I guess it’s helps in liking a game if you usually win).

scottparat answers:

I ike this game and its free

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