I think the land for it represents a DUNE
        
                    
             
        
        
        
Answer:
The correct answer is periods. See the explanation below, please.
Explanation:
The horizontal lines in the periodic table are called periods (ranging from 1 to 7) and vertical lines (ranging from 1 to 18).
The period that an element belongs to coincides with the last electronic layer of the element (that compound in period 3 will have 2 electronic layers).
 
        
                    
             
        
        
        
Answer:
1.33 L.
Explanation:
- We can use the general law of ideal gas: PV = nRT.
 
where, P is the pressure of the gas in atm.
V is the volume of the gas in L.
n is the no. of moles of the gas in mol.
R  is the general gas constant,
T is the temperature of the gas in K.
- If n and T are constant, and have different values of P and V:
 
<em>(P₁V₁) = (P₂V₂)</em>
<em></em>
Knowing that:
V₁  =  4.0 L, P₁ = 2.0 atm,
V₂  =  ??? L, P₂ = 6.0 atm.
- Applying in the above equation 
 
(P ₁V₁) = (P₂V₂) 
<em>∴ V₂ = P ₁V₁/P₂</em> = (2.0 atm)(4.0 L)/(6.0 atm) =<em> 1.33 L.</em>
 
        
             
        
        
        
Half-life is defined as the amount of time it takes a given quantity to decrease to half of its initial value.  The equation to describe the decay is 
Nt=N0(1/2) 

  where N0 is the initial quantity, Nt is the remaining quantity after time t, t1/2 is the half-time.  So work out the equation, t1/2 = t (-ln2)/ln(Nt/N0) = 11.5*(-ln2)/ln(12.5/100) = 3.83 days
 
        
             
        
        
        
Answer:
The answer is 
<h2>720 Joules</h2>
Explanation:
The kinetic energy of a body can be found by using the formula
<h3>

</h3>
where
m is the mass
v is the velocity / speed
From the question
mass = 10 kg
velocity = 12 m/s
Substitute the values into the above formula and solve
That's
<h3>

</h3>
We have the final answer as
<h3>720 Joules</h3>
Hope this helps you