Answer: B - 8 
Explanation: 8 protons because number of protons is equal to number of atoms in the nucleus. 
 
        
             
        
        
        
A distance of d is covered with 53 mile/hr initially.
Time taken to cover this distance t1 = d/53 hour
Next distance of d is covered with x mile hours.
Time taken to cover this distance t2 = d/x hours.
We have average speed = 26.5 mile / hour           
                                          = Total distance traveled/ total time taken                   
                                          = 
                               
 
        
             
        
        
        
Answer:
199.0521 Will be the answer
 
        
             
        
        
        
Answer:
1 millions times stronger
 
        
             
        
        
        
Answer:
v ≈ 7900 m/s
Explanation:
centripetal force will equal gravity force
mv²/R = mg
v²/R = g
v² = Rg
v = √(Rg)
v = √(6.4e6(9.8)) 
v = 7.91959...e+3 
v ≈ 7900 m/s
of course, at those velocities and that deep into the atmosphere, the satellite would quickly burn up, slow down, and cause tremendous damage to buildings etc. with the sonic boom shock wave. It would also have to avoid a lot of mountains as 4000 m is not that high.