Cruising at 35,000 feet in an airliner, straight toward the east, 
at 500 miles per hour.  
Since your speed is not changing and you're moving in a straight line,
your acceleration is zero.
        
             
        
        
        
Answer is in the photo. I can only upload it to a file hosting service. link below!
tinyurl.com/wpazsebu
 
        
             
        
        
        
<u>Answer:</u> The correct answer is Option 2.
<u>Explanation:</u>
Centripetal force is defined as the force that acts on a body moving in a circular path and is directed towards the center around which the body is moving.
Mathematically,

Where,
 = centripetal force
 = centripetal force
m = mass of the object
v = tangential velocity
r = radius of the path
From the above relation, X corresponds to the radius and Y corresponds to the tangential velocity.
Hence, the correct answer is option C.
 
        
                    
             
        
        
        
The formula for K+ and S-2 is K2S because you need 2 potassium ions to balance out the sulfide ion