Questions 1–3 refer to a ball of mass m on
a string of length R, swinging around in circular
motion, with instantaneous velocity v and centripetal
acceleration a.


1. 
What is
the centripetal acceleration of the ball if the length of the string
is doubled? 
 (A) 
a/4 
 (B) 
a/2 
 (C) 
a 
 (D) 
2a 
 (E) 
4a 


2. 
What is
the centripetal acceleration of the ball if the instantaneous velocity
of the ball is doubled? 
 (A) 
a/4 
 (B) 
a/2 
 (C) 
a 
 (D) 
2a 
 (E) 
4a 


3. 
What is
the centripetal acceleration of the ball if its mass is doubled? 
 (A) 
a/4 
 (B) 
a/2 
 (C) 
a 
 (D) 
2a 
 (E) 
4a 
