<p>Determine the <strong>force</strong> (in Newtons) to pull a metal bar away fr

Question

<p>Determine the <strong>force</strong> (in Newtons) to pull a metal bar away from a magnet, given:</p>
<p>* A horseshoe magnet is suspended in air<br />* A metal bar is placed beneath &amp; held by magnetic attraction<br />* A weight of 5 grams is attached to the metal bar by a cord of length l<br />* The 5 gram weight is sufficient to pull the metal bar away from the magnet<br />* F = ma</p>
<p>a = 9.81 <img src="https://s3.amazonaws.com/answer-board-image/cramster-equation-2011812202426344877744241118813013.gif" alt="" align="absmiddle" /><br />m = 5 grams or 0.005 kg<br />Therefore <strong>F₂</strong> = ma = <strong>49 mN</strong>&#160;or 49 x 10^-3&#160;<img src="https://s3.amazonaws.com/answer-board-image/cramster-equation-20118122030596344877785941838419099.gif" alt="" align="absmiddle" /><br /><br />Is F₂ accurate?&#160; Does the cord length l and angle shown in the diagram affect F₂?&#160; Thanks</p>
<p><img class="mceBlock" src="https://s3.amazonaws.com/answer-board-image/6189472e-d6ac-495d-a02b-352e1aae093a.jpeg" border="0" alt="uploaded image" width="276" height="540" /></p>

Explanation / Answer

can't find the numerical values in it and may be question itself

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