Question

<p><strong>Investigation&#160;4:</strong>&#160;Assumethat the top disk is identical to the &#8220;Top StainlessSteel Disk&#8221; described in the manual except that it is<span style="color: #ff0000;">7.3</span>% more massive.It is spinning at angular velocity <span style="color:#ff0000;">781</span>&#160;deg/s. After it drops on tothe initally stationary bottom disk, they spin at the common rateof <span style="color:#ff0000;">398</span>&#160;deg/s.</p>
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<p>If the shape of the lower disk is as described in themanual, what is its mass?<br /><spanclass="qTextField"><input id="RN_1730486_0_11_1731320"dir="ltr" onkeyup="if(typeof change_mark =='function'){change_mark('RN_1730486_0_11_1731320','')}"name="RN_1730486_0_11_1731320" size="10" type="text"/></span>&#160;kg</p>
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<td>Top stainless steel:&#160;</td>
<td><span class="qTextField"><span class="box_num"style="display: none;" title="Points:1/1">&#160;</span><inputid="RN_1730486_0_0_1731320" dir="ltr" onkeyup="if(typeofchange_mark =='function'){change_mark('RN_1730486_0_0_1731320','2.752')}"name="RN_1730486_0_0_1731320" size="10" type="text" value="2.752"/></span><img id="mark_RN_1730486_0_0_1731320"title="Your answer is correct."src="http://www.webassign.net/wastatic/wacached67d8ab4f4c10bf22aa353e27879133c/common/img/tick.png"alt="Your answer is correct."/>&#160;g&#183;m^{<small>2</small>}</td>
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<td>Bottom stainless steel:&#160;</td>
<td><span class="qTextField"><span class="box_num"style="display: none;" title="Points:1/1">&#160;</span><inputid="RN_1730486_0_1_1731320" dir="ltr" onkeyup="if(typeofchange_mark =='function'){change_mark('RN_1730486_0_1_1731320','2.726')}"name="RN_1730486_0_1_1731320" size="10" type="text" value="2.726"/></span><img id="mark_RN_1730486_0_1_1731320"title="Your answer is correct."src="http://www.webassign.net/wastatic/wacached67d8ab4f4c10bf22aa353e27879133c/common/img/tick.png"alt="Your answer is correct."/>&#160;g&#183;m^{<small>2</small>}
<p>&#160;</p>
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<td>&#160;</td>
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<td>Top aluminum:&#160;</td>
<td><span class="qTextField"><inputid="RN_1730486_0_2_1731320" dir="ltr" onkeyup="if(typeofchange_mark =='function'){change_mark('RN_1730486_0_2_1731320','.9411')}"name="RN_1730486_0_2_1731320" size="10" type="text" value=".9411"/></span><img id="mark_RN_1730486_0_2_1731320"title="Your answer is correct."src="http://www.webassign.net/wastatic/wacached67d8ab4f4c10bf22aa353e27879133c/common/img/tick.png"alt="Your answer is correct."/>&#160;g&#183;m^{<small>2</small>}
<p>&#160;</p>
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<td>&#160;</td>
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