Thursday
October 23, 2014

Homework Help: Physics

Posted by Molly on Tuesday, February 11, 2014 at 7:10pm.

A large horizontal circular platform (M=143.1 kg, r=3.01 m) rotates about a frictionless vertical axle. A student (m=75.3 kg) walks slowly from the rim of the platform toward the center. The angular velocity ω of the system is 2.10 rad/s when the student is at the rim. Find ω (in rad/s) when the student is 2.89 m from the center.


Physics - Damon, Tuesday, February 11, 2014 at 6:25pm
conservation of angular momentum (the figure skater spins faster when she pulls her arms in

I1 omega1 = I2 omega2

I of platform = (1/2)(143.1)(3.01)^2
original I of student = m r^2 = 75.3(3.01)^2
final I of student = 75.3(2.89)^2


Physics - Molly, Tuesday, February 11, 2014 at 6:54pm
something is wrong in the answer, can you explain it again please?..

Answer this Question

First Name:
School Subject:
Answer:

Related Questions

Physics - A large horizontal circular platform (M=143.1 kg, r=3.01 m) rotates ...
physics - A horizontal circular platform (m = 108.1 kg, r = 3.25m) rotates ...
physics - A child of mass 40 kg stands beside a circular platform of mass 90 kg ...
Physics - A child of mass 40 kg stands beside a circular platform of mass 115 kg...
Physics - A child of mass 40 kg stands beside a circular platform of mass 100 kg...
Physics - a 32 kg child stands at the edge of a circular platform that rotates ...
physics - A person of mass 84.5 kg is initially at rest on the edge of a large ...
Physics - An amusement ride consists of a large horizontal circular platform ...
Physics - A platform rotates at an angular speed of 2.2 rad/s. A block rests on ...
Physics - A platform rotates at an angular speed of 2.2 rad/s.  A block rests on...

Search
Members