A 0.152 kg ball is attached to a string that is 62.2 cm long. The string will break if subjected to a tension force of 4.8 N. If a small child swings the ball in a horizontal circle around her head, at what velocity will the string break?

The value is  

Explanation:

From the question we are told that

   The mass the ball is  

    The length of the string is

      The tension of force that will break the string is

Generally the radius of the circle made by swinging the  string is  

     Generally the centripetal force acting on the ball is mathematically represented as  

Generally this centripetal force is mathematically represented as

=>      

=>      

=>      

lol

explanation:

the minimum amperage that the current in this wire would have to have so that its weight is completely supported by the magnetic force due to earth's field, assuming that no other forces except gravity act on it