- 3

- 0

**1. Homework Statement**

A 180 g ball on a 60-cm-long string is swung in a vertical circle about a point 200 cm above the floor. The tension in the string when the ball is at the very bottom of the circle is 5.6 N. At the very bottom of the circle, a very sharp knife is suddenly inserted, as shown in the figure View Figure , to cut the string directly below the point of support.

**2. Homework Equations**

V=sqrt(a R)

a=(F-W)/m = (F - mg)/m=F/m -g

**3. The Attempt at a Solution**

R=.6m

For a free fall

t=sqrt(2h/g)

S=Vt=

S=sqrt(a R) sqrt(2h/g)

S=sqrt(a R 2h/g)

S=sqrt(2[F/m -g] R h /g)

S=sqrt(2 [ 5.6N/ .180 - 9.81] 0.6 x 0.200 /9.81)

S=0.72m

I keep getting this answer. I'm unsure of what I'm doing wrong.