<p>1) A 2.0 kg ball is attached to a vertical post with two strings, one 2.0 m l

Question

<p>1) A 2.0 kg ball is attached to a vertical post with two strings, one 2.0 m long and the other 1.0 m long as shown in the figure. If the the ball is set whirling in a horizontal circle, what is the minimum speed necessary for the lower string to be taught? If the ball has a constant speed of 6 m/s find the tension on each string. <br /><br /></p>
<p><img class="mceBlock" src="https://s3.amazonaws.com/answer-board-image/4fa6fd44-2f3d-43ca-bbb7-e7b31617391c.jpeg" border="0" alt="uploaded image" width="160" height="118" /></p>
<p><br />2) At the end of a factory production line, boxes start from rest and slide down a 30 degree ramp 5.4 m long. If the slide is to take no more then 3.3 s, what is the maximum coefficient of friction between the box and the slide?</p>

Explanation / Answer

Angle = cos-1 ( 1 / 2) = 60o
So that tension in the upper string is
               T' sin = mg
            ==> T' = mg/ sin
                        = 2 * 9.8 / sin60
                        = 22.63 N
Tension in the horizontal string is
                   T = mv2 / r - T'cos
                      = 2 * 36 / 2 - 22.63 cos60
                      = 24.68 N the tension in the string is 24.68 N. ** please post each question separatly

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