physics: please answer the following....?

Question

TABLE A g/cm^3
LIQUID:
A
B
C
D
E
DENSITY, 9m/ml
1.30
0.79
1.60
1.40
8.88

1.) where will a body sink more in fresh water or in a sea water? why?
2.) refer to table A, a solid sinks in all the liquids. which liquid exerst the greatest buoyant force on solid? why?
3.) refer to table A, a stone of density 3g/cm^3 is dropped in each liquid; in which liquid will the stone float?why?
4.)refer to table A,a solid is placed in each liquid and sank in all of them. the volume of liquid displaced is
a.) the samefor the liquids
b.) greatest in liquid E
c.) gratest in liquid B
d.) least in liquid E
e.) leastin liquid A
PROBLEM:
1.) about two third of your body mass consist of water. calculate the volume of water on a 70kg person.
2.) an object weighs 145g in air,135g in water,136.6gin gasoline and132.4g in glycerine.determine the specific gravity of a.) the object b.) gasoline c.) glycerine

-ANALYSIS OF DATA
-CONCLUSION

Answer 1

1. Salt water has a higher density than fresh water therefore a body will sink more in fresh water.

2. See answer to problem 1.

3. E. see answer to problem 1

4. Obviously A .

Problem 1
m= 0.7 x 70
since p=m/V (for water p=1000 kg/ m^3 or 1 g/cm^3
V= m/p = ( .7 x 70)/1000=.049m^3 = 49,000cm^3

Answer 2

1. in fresh water
sea water has salt in it .so it is heavier than fresh water.so the bioncy of body is less in fresh water.so it sinks more in fresh water.
problem 2. gravity of
object=14.4
gasoline=0.34
glysarine=1.26(sorry,i havenot much time to give thecalculation)