Posted by **chrystabelle** on Thursday, November 10, 2011 at 8:00am.

To verify her suspicion that a rock specimen is hollow,a geologist weighs the specimen in air and in water.She finds that the specimen weighs twice as much in air as it does in water.The solid part of the specimen has a density of 5 multiplied by 10cubedkg/meter cubed.What fraction of the specimen's apparent volume is solid

- physics -
**bobpursley**, Thursday, November 10, 2011 at 8:30am
Lets make it simple: Let the size of the rock in air have a mass of 200kg, in water, half that.

So the bouyancy from water is 100kg*g, meaning the rock volume is 100kg/densitywater= 100kg/(1000kg/m^3)=.1m^3

now, the rock consist of two parts: hollow, and rock.

volume rockpart=massrock/density=100kg/(5E3kg/m^3= 20E-3 m^3

fraction which is solid= .020/.1=20 percent. Check my work

fraction which is solid=

- physics -
**David**, Thursday, November 10, 2011 at 12:12pm
A mass m = 4.3 kg is attached to a vertical spring with k = 210 N/m and is set into motion. What is the frequency of the oscillation?

- physics -
**jamie**, Thursday, December 29, 2011 at 2:28am
Volume of solid in sample is 40%

Density of sample = 2 (from informaton)

If,for example, sample is 100cm3:

Volume(solid)=40 cm3 (from above)

Since density of rock is 5, therefore mass of rock (from 40 cm3)=200g

Therefore density of sample=200/100=2

This verifies the above density for the sample (according to info provided)

## Answer This Question

## Related Questions

- physics - To verify her suspicion that a rock specimen is hollow, a geologist ...
- Physics - A specimen has .625 the amount of carbon 14 you would find in a living...
- Physics - A specimen has .625 the amount of carbon 14 you would find in a living...
- Physics - A specimen has .625 the amount of carbon 14 you would find in a living...
- Lab Math-Dilutions - You have 1.50mL of a urine specimen. The assay you are ...
- AP Physics - A student found an unknown substance. In an effort to identify the ...
- physics - You are at a archeological dig an discover a strange artifact. It is a...
- physics - You are on an archaeological dig and discover a strange artifact. It ...
- physics - A 200 gram copper calorimeter contains 400 grams of water at 25 C. A ...
- CICI - How do light microscopes work? Light microscopes use an electron beam to ...

More Related Questions