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runningirl

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## Homework Statement

Students are playing with the 4.13 kg bowling ball hung from the ceiling of the classroom. When at rest, it hangs 0.63 m above the floor. The cord is 1.87 long. The students pull the ball up and to the side and then let go. It swings back and forth like a pendulum. The students pull it so it is 1.40 m above the ground.

a) What is the ball's velocity when it's at the lowest point? Assume no air resistance.

b) What's the tension in the string at this point?

## Homework Equations

## The Attempt at a Solution

a) (1/2)mv^2=mgh

.5(4.13)v^2=4.13*9.8*.63

v=3.51 m/s?

b) mgh=F(1.4-.63)

9.8*4.13*.63=F(.77)

F=33.11 N?

I don't know if I did a right, and I don't know how to do b...

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