<span>This
is because astronomers have discovered that
the Crab Nebula is 6500 light years from earth. This means it takes 6500 earth years
for light to get from the Crab Nebula to
earth. Therefore, if we are able to observe the
Crab Nebula and beyond it then it means that earth has been in existence for 6500 years and
over.  </span>
        
             
        
        
        
Here is the answer of the given problem above.
Use this formula: <span>P = FV = ma*at = ma^2 t
</span><span>Substitute the values, and therefore, we got m(a0)^2t = m(x)^2 (2t)
then, solve for x which is the acceleration at 2t. 
</span>The <span>answer would be a0/sqrt(2).
Hope this answers your question. Thanks for posting.
</span>
        
             
        
        
        
Answer:
x =  0.0734 m = 7.34 cm
Explanation:
First we shall calculate the area of the piston: 

Now, we will calculate the force on the piston due to atmospheric pressure:

Now, for the compression of the spring we will use Hooke's Law as follows:

where,
k = spring constant = 3400 N/m
x = compression = ?
Therefore,
<u>x =  0.0734 m = 7.34 cm</u>
 
        
             
        
        
        
Answer:
mass consumed by 235U each day = 2 kg
Explanation:
electrical power produced = 1 GW = 1 × 10⁹ × (6.24151 × 10¹⁸ ) eV 
                                             = 6.24151× 10²¹ MeV/s
thermal energy =  0.420 * 250 = 105 MeV

                                       = 5.94 × 10¹⁹ fission/second
                                        =5.94 × 10¹⁹× 24 × 60 ×60) 
                                       =  5.13 × 10²⁴ fission/day
mu = 235.04393 ×  1.660× 10 ⁻²⁷ = 390.1729× 10⁻²⁷ Kg
M = mu ×5.13 × 10²⁴
    = 390.1729× 10⁻²⁷ ×5.13 × 10²⁴
M   =  2 kg(approx.)
mass consumed by 235U each day = 2 kg