Posted by chrystabelle on Thursday, November 10, 2011 at 8:00am.
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=
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?
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)
Related Questions
physics - To verify her suspicion that a rock specimen is hollow, a geologist ...
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 ...
Earth Science - 1.Which statement made by a student after examining a rock ...
Physics - A precious-stone dealer wishes to find the specific heat capacity of ...
AP Physics - A rock, which weighs 350 lb in air, weighs 226 lb when submerged in...
Physics - A rock, which weighs 350 lb in air, weighs 226 lb when submerged in ...
Physics - A rock, which weighs 350 lb in air, weighs 226 lb when submerged in ...
chemistry - You are conducting experiments with your x-ray diffractometer. (a) A...
chemistry - You have two specimens of copper, both of them polycrystalline. ...
For Further Reading
