An object moving on a circular path at a constant speed is said ...

[jparksx]

An object moving on a circular path at a
  constant speed is said to be accelerating
  because
  a) the magnitude of the acceleration itself is changing.
  b) the magnitude of the velocity is changing.
  c) the direction of the velocity is changing.
  d) the magnitude is changing.
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Question 2

A wheel starts from rest and rotates with a constant angular acceleration about a fixed axis. It completes the first revolution 6.0 s after it started. How long after it started will the wheel complete the second revolution?
 a. 9.9 s
  b. 7.8 s
  c. 8.5 s
  d. 9.2 s
  e. 6.4 s

[jliusyl]

Answer to Question 1

c

Answer to Question 2

c