# Homework Help: Motion in a Circle

1. Jun 9, 2014

### gummybeargirl

1. The problem statement, all variables and given/known data
A small mass M attached to a string slides in a circle (x) on a frictionless horizontal table, with the force F providing the necessary tension (see figure). The force is then increased slowly and then maintained constant when M travels around in circle (y). The radius of circle (x) is twice the radius of circle (y).
1) M's kinetic energy at y is four times that at x.
2) M's angular momentum at x is .... that at y.
3) M's angular velocity at x is one quarter that at y.
4) As M moves from x to y, the work done by F is .... 0.
5) While going from x to y, there is no torque on M
Each has the options of True/False/Less than/Greater than/Equal to

2. The attempt at a solution
1) False
2) Greater than
3) False
4) False
5) True

File size:
1.3 KB
Views:
232
2. Jun 9, 2014

### jackarms

Hey, I just saw your other post too. So, same as that one, could you first explain your reasoning for each answer? It helps a lot in seeing if you got the problem right.

3. Jun 9, 2014

### gummybeargirl

Nevermind!!! I was able to get this one as well. My answer turned out to be
1) true
2) equal to
3) true
4) greater than
5) true