Posted by **Anonymous** on Thursday, January 31, 2013 at 7:44am.

a sphere wall is 20mm thick, inside diameter is 10M. What is the mass of steel if the density is 7850Kgm3?

- maths -
**Reiny**, Thursday, January 31, 2013 at 10:06am
find volume of the shell

r1 = 10 m = 1000 cm = 10000 mm

V1 = (4/3)π(10000)^3 = ....

r2 = 10000 - 20 = 9980 mm

V2 = (4/3)π(9980)^3 = ....

volume of shell = V1 - V2 = ....

7850 kg/m^3

= 7850000 g/(100^3 cm^3)

= 7.85 g / cm^3

= .00785 g/ mm^3

I will let you do all the button-pushing

Use the memories in your calculator, don't round off any intermediate numbers, let your machine do the work for you

## Answer This Question

## Related Questions

- physics - Although these quantities vary from one type of cell to another, a ...
- maths - three spheres of diameter 2,3 & 4cms formed into a single sphere.Find ...
- physics - Ali needs to fix plug inside the wall, he then buy a steel plug that ...
- physics - Styrofoam has a density of 300 kg/m^3. What is the maximum mass that ...
- Physics - A solid uniform sphere has a mass of 2.0 104 kg and a radius of 1.5 m...
- Physics - Assume you construct a new water tower for a town water supply. Assume...
- physics - Consider three layers of a wall. The first layer is plaster 1.0 cm ...
- physics - Assume that if the shear stress in steel exceeds about 4.00 108 N/m2, ...
- physics - 1.A 500.0 g mass is placed on a 20.0 cm cube of gelatin. The 500.0 g ...
- physics - 1.A 500.0 g mass is placed on a 20.0 cm cube of gelatin. The 500.0 g ...

More Related Questions