### Help with 2 problems! they seem so simple but I can't get it

Posted:

**Mon Apr 16, 2007 6:41 am**HELP!!

I am stuck with this 2 problems from an undergrad book. They seem so easy but I can't find the answer (and this book only give answers to some questions...

Can u give me a tip in any one of those PLEASE?????

1. Water flows over a section of niagara falls at a rate of 1.20 kg/s and falls 5.0 m. What is the power dissipated by the waterfall?

2. A 2 kg ball has zero kinematic and potential energy. You drop this ball into a 10. m-deep well. Just before the ball hits the bottom, the sum of its potential and kinetic energy is? How about after the ball comes to a stop?

thank you sooooo much for any help!!!!

Melissa

I am stuck with this 2 problems from an undergrad book. They seem so easy but I can't find the answer (and this book only give answers to some questions...

Can u give me a tip in any one of those PLEASE?????

1. Water flows over a section of niagara falls at a rate of 1.20 kg/s and falls 5.0 m. What is the power dissipated by the waterfall?

2. A 2 kg ball has zero kinematic and potential energy. You drop this ball into a 10. m-deep well. Just before the ball hits the bottom, the sum of its potential and kinetic energy is? How about after the ball comes to a stop?

thank you sooooo much for any help!!!!

Melissa