The half life of Carbon-14 is 5730 years, how many years would it take for 7/8 of the original amount to decay? 
<span>Can somebody please help with this problem. I *think* I understand the basics of what a half life is. If I learned correctly, its the amount it takes for half of a sample to decay. It should also happen exponentially, 1/2 remaining after one half life, 1/4 after the second, 1/16 after the third etc. I'm still a little shaky though. Could somebody please clarify what exactly a half life is and how it can be determined (i.e. how to find the time it would take for 7/8 to decay) </span>
        
                    
             
        
        
        
At position of maximum height we know that the vertical component of its velocity will become zero 
so the object will have only horizontal component of velocity
so at that instant the motion of object is along x direction
while if we check the acceleration of object then it is due to gravity
so the acceleration of object is vertically downwards
so it is along y axis
so here these two physical quantities are perpendicular to each other
so correct answer would be
<em>C)At the maximum height, the velocity and acceleration vectors are perpendicular to each other. </em>
 
        
                    
             
        
        
        
He preformed the first ever successful open heart surgery
        
             
        
        
        
Answer:
62 cm is in front of the mirror 
Explanation:
This is answers