The elastic potential energy of the spring is 0.31 J
Explanation:
The elastic potential energy of a spring is given by

where
k is the spring constant
x is the compression/stretching of the spring
For the spring in this problem, we have:
k = 500 N/m (spring constant)
x = 0.035 m (compression)
Substituting, we find the elastic potential energy:

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The answer to fill in the blank in the question above is "greater than" based on the physic of the air density. The density of air is affected by the temperature and the pressure based on the ideal gas law. A high pressure will make the air becomes denser and the bottom of swimming pool has a higher pressure than the surface<span>.</span>
        
             
        
        
        
Answer:
c. the volume of the part of the ship that lies below the water's surface.
Explanation:
As stated in the problem, Archimedes' Principle tells us that that buoyant force on an object is equal to the weight of fluid it displaces.  The volume of water that a ship displaces is the volume it occupies below the surface.
 
        
             
        
        
        
Answer:
<h2>
  The answer is </h2><h2>
a. 5g/mL</h2>
Explanation:
Given data
mass m= 45g 
volume v= 9mL
we know that density=m/v
substituting our given data we have

What is Density?
The Density of a body can be defined as the ratio of mass to volume, 
or 
Density, mass of a unit volume of a material substance. The formula for density is  ,
,
 where d is density,
 M is mass, and
 V is volume. 
Density is commonly expressed in units of grams per cubic centimetre.