# Transformations of Energy in a Pendulum Type Experiment

1. Apr 1, 2012

### Khaled332

1. The problem statement, all variables and given/known data

The string in Fig. 8-35 is L = 120 cm
long, has a ball attached to one end, and is
fixed at its other end. The distance d to the
fixed peg at point P is 75.0 cm. When the
initially stationary ball is released with the
string horizontal as shown, it will swing
along the dashed arc. What is its speed
when it reaches
1.What is the tension of the string at the final position (answer in terms of m, g, L, a)
2. What is the minimum value ofd so the ball will reach the final position (answer in the same terms)

2. Relevant equations

Ep=mgL ; Ek=mv^2/2

3. The attempt at a solution

1. Fu=T-mg
Fu=T-9.8a
ma=T-9.8a
T=ma+9.8a ? T=ma+ga

2.Cannot understand
Thanks
1. The problem statement, all variables and given/known data

2. Relevant equations

3. The attempt at a solution
1. The problem statement, all variables and given/known data

2. Relevant equations

3. The attempt at a solution