Answer:
5.79 in
Explanation:
We are given that
Diameter,d=0.30 in
Radius,r=
Weight of hydrometer,W=0.042 lb
Specific gravity(SG)=1.10
Height of stem from the water surface=3.15 in
Density of water=
In water
Volume of water displaced 
Volume of another liquid displaced=
Change in volume=V-V'

Substitute the values

By using
1 ft=12 in


l=2.64 in
Total height=h+l=3.15+2.64= 5.79 in
Hence, the height of the stem protrude above the liquid surface=5.79 in
Hi there!
Recall the equation for centripetal force;

m = mass (kg)
v = velocity (m/s)
r = radius (m)
We are not given the mass directly, we are given the object's weight.


Now, we can plug this value along with the given velocity and radius to solve:

Water breaks down into hydrogen and oxygen: It is a decomposition reaction as a single substance decomposes to give two products.

Leaves make starch using chlorophyll and carbon dioxide: Synthesis reaction: as the synthesis reaction involves two or more than two reactants which join together to result into a single main product along with the formation of simple by products.

Food burns in oxygen gas and releases a lot of energy: Combustion: Combustion process involves the use of oxygen to give products along with release of energy.

Adding vinegar (acid) to baking soda (alkali) gives a product that is neither acidic nor alkaline: Neutralization: acetic acid in vinegar reacts with soda (base) to give salt (neutral) and .

Your answer is a new experiment, since it's something that hasn't been tried before, or has, but resulted in with lots of errors.