Answer to Question 6

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(a) v = wr w = 7.0 m s-1 0.98 m 
 
      w = 7.14 rad s-1
 
(b) a = v2/r = 49 m2 s-2 0.98 m  = 50 m s-2 
 
 
 
(c) F = ma F = 0.5 kg 50 m s-2 = 25 N
 
     Least tension is when acceleration = 50 m s-2 9.8 m s-2 = 40.2 m s-2
 
     F = 0.5 kg 40.2 m s-2 = 20.1 N