Monday

March 2, 2015

March 2, 2015

Posted by **Sandhya** on Monday, October 27, 2008 at 11:30pm.

I used energy consideration & got the following answer. But the answer is incorrect.Please point out where i have gone wrong

Under the water you have the net force on the ball; F= 40 N. That force acts over

a distance D (1.5 m in this case) and thus does work on the ball giving it some

KE as it leaves the water: KE = FD. = 40*1.5 = 60 J

To find out how high the ball rises in the air, set that initial KE to the PE at the top

of the motion: KE = FD = 60 J = mgH. Now solve for H. where m = 1 kg

H = 60/1*9.8

= 6.12 m

- physics -
**drwls**, Tuesday, October 28, 2008 at 7:39amPerhaps it has something to do with the radius of the ball. When the center of the ball has risen 1.50 - 0.44 m, it is no longer fully submerged. They want you to assume that work stops then. It is not clear where to measure the potential energy change from: the surface or one radius below.

The answer you get depends upon the approximations made

**Answer this Question**

**Related Questions**

physics - A 1.13 kg hollow ball with a radius of 0.139 m, filled with air, is ...

physics - A 0.9 kg hollow ball with a radius of 0.12 m, filled with air, is ...

physics - An Olympic pool has dimensions 50.0 m × 25.0 m × 2.68 m (length × ...

Math - A swimming pool is 40 feet long, 20 feet wide, 8 feet deep at the deep ...

Calculus - A swimming pool is 40 feet long, 20 feet wide, 8 feet deep at the ...

physics - A thin spherical shell with mass of .4kg and diameter of .2m is filled...

physics - A thin spherical shell of mass 4.00 kg and diameter 0.200 m is filled...

physics - A thin spherical shell of mass 0.450 kg and diameter 0.190 m is filled...

physics - A thin spherical shell of mass 0.450 kg and diameter 0.190 m is filled...

physics - A thin spherical shell of mass 0.400 kg and diameter 0.190 m is filled...