Posted by **ashley** on Saturday, June 11, 2011 at 1:37am.

Assuming that 68.1% of the Earth's surface is covered with water at average depth of 1.21 mi. ,estimate the mass of the water on Earth. One mile is 1.609 km and the radius

of the earth is 6.37 x 10^6 m. Answer in units of kg

- physics -
**drwls**, Saturday, June 11, 2011 at 3:40am
The volume in cubic meters is the product of the ocean area (in m^2) and the average depth (in meters).

For the ocean area, take 68.1% of 4*pi*R^2.

For the mass of the water, multiply the volume by 1000 kg/m^3. Actually you should use a higher density of 1027 kg/m^3, corresponding to ocean salt water, since that is what most of it is.

Calculating these numbers yourself will improve your learning experience

- physics -
**ashley**, Sunday, June 12, 2011 at 3:32pm
I multiplied 68.1 X 5.099043638x10^14=3.472448717x10^16 to get the ocean area.

Then to get the average depth i took 1.21mix1609m=1946.89.

Then i multiplied the ocean area and volume i got to equal 6.760475683x10^19.

To get the mass, I took that answer and multiplied it to 1000 kg/m^3. I got 6.760475683x10^22. If i put that in significant figures it woud just be 6.76 x 10^22 kg right? was my method correct?

## Answer This Question

## Related Questions

- Algebra 1 - Earth has a radius of about 6.4 x 10 to the 6th power m. Approximate...
- Maths - Assuming the earth to be a sphere of radius 6370 km.If seventy five ...
- earth science - The global ocean covers about 70% of the Earth’s surface. If all...
- physics - Assuming the Earth's magnetic field averages about 0.50×10−4 T ...
- Earth Science - 1. The water cycle is the _____. A. distribution of drinking ...
- physics problem!! - If the water molecules in 5.70 g of water (H2O) were ...
- Physics - A 1.0kg mass weighs 9.8 Newton on earth's surface, and the radius of ...
- PHYSICS - Search: a 1.0 kg mass weighs 9.8 n on earths surface and the radius of...
- physics-mechanics - A 1.0 kg mass weighs 9.8 N on Earth's surface, and the ...
- physics - A satellite of mass 225 kg is launched from a site on Earth's equator...

More Related Questions