"Suppose you tie a rock to the end of a 0.96 m long string and spin it in a horizontal circle with a constant angular velocity of 20.25 rad/s. If the tension in the string is 970 N, what is the mass of the rock (ignore gravity)

The mass of the rock is  

Explanation:

From the question we are told that

   The length of the string is  

    The angular velocity is  

     The tension on the string is

Generally the centripetal force acting on the rock is mathematically evaluated as

making m the subject of the formula

substituting values

they should be similar or the same

c. magnitude and direction