Posted by **Anonymous** on Monday, August 8, 2011 at 11:52am.

Chap. 7, #36. (II) A ball is dropped from a height of 1.50 m and rebounds to a height of 1.20 m. Approximately how many rebounds will the ball make before losing 90% of its energy?

- Physics 1 (college) -
**bobpursley**, Monday, August 8, 2011 at 3:27pm
energy retained each bounce: 1.2/1.4=6/7

(6/7)^n=.1

log of each side

n log (6/7)= -1

solve for n.

- physics -
**bobpursley**, Monday, August 8, 2011 at 9:21pm
change that fraction to 1.2/1.5 or 4/5. I misread.

- Physics 1 (college) -
**john**, Monday, March 3, 2014 at 5:49pm
I don't understand where you got .1 and then -1 from. Can you explain that?

## Answer This Question

## Related Questions

- Physics - A ball is dropped from a height of 1.45m and rebounds to a height of 1...
- Maths - A ball is dropped from a height of 80ft.The elasticity of this ball is ...
- Maths - A ball is dropped from a height of 80ft.The elasticity of this ball is ...
- math - A basketball is dropped from a height and it rebounds. Each time the ...
- Math - A ball rebounds the ground to a height of 72 cm, and each time it ...
- math - A tennis ball is dropped from a height of 7 ft. If the ball rebounds 2/3...
- college physics - A small ball of mass m is aligned above a larger ball of mass ...
- college physics - After falling from rest from a height of 34 m, a 0.47 kg ball ...
- college physics - After falling from rest from a height of 34 m, a 0.47 kg ball ...
- math - A ball is dropped from a height of 5 ft. Assuming that on each bounce ...

More Related Questions