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<h2 class="hd hd-2 unit-title">Lecture Files & Content</h2>
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<p><a href="/assets/courseware/v1/3af3fcab3c46aa410a518c568e3725d3/asset-v1:MITx+16.885x+3T2019+type@asset+block/Lecture_19_-_Wayne_Hale_-_Mission_Control.pdf" target="[object Object]">Lecture Slides</a></p>
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<h2 class="hd hd-2 unit-title">Mission Control: Part I</h2>
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<h4 class="hd hd-5">Transcripts</h4>
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<a class="btn btn-link" href="/courses/course-v1:MITx+16.885x+3T2019/xblock/block-v1:MITx+16.885x+3T2019+type@video+block@da6ec72802f04204944d21b21ce6067d/handler/transcript/download" data-value="srt">Download SubRip (.srt) file</a>
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<a class="btn btn-link" href="/courses/course-v1:MITx+16.885x+3T2019/xblock/block-v1:MITx+16.885x+3T2019+type@video+block@da6ec72802f04204944d21b21ce6067d/handler/transcript/download" data-value="txt">Download Text (.txt) file</a>
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<h2 class="hd hd-2 unit-title">Mission Control: Part II</h2>
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<h3 class="hd hd-2">Video</h3>
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<a class="btn btn-link" href="/courses/course-v1:MITx+16.885x+3T2019/xblock/block-v1:MITx+16.885x+3T2019+type@video+block@1056cc7f2c57486fa3f72b6b0be4df95/handler/transcript/download" data-value="srt">Download SubRip (.srt) file</a>
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<a class="btn btn-link" href="/courses/course-v1:MITx+16.885x+3T2019/xblock/block-v1:MITx+16.885x+3T2019+type@video+block@1056cc7f2c57486fa3f72b6b0be4df95/handler/transcript/download" data-value="txt">Download Text (.txt) file</a>
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<h2 class="hd hd-2 unit-title">Mission Control: Part III</h2>
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<h3 class="hd hd-2">Video</h3>
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<a class="btn btn-link" href="/courses/course-v1:MITx+16.885x+3T2019/xblock/block-v1:MITx+16.885x+3T2019+type@video+block@066ee120488046c9b903ca58bfb5368b/handler/transcript/download" data-value="txt">Download Text (.txt) file</a>
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<h2 class="hd hd-2 unit-title">Mission Control: Part IV</h2>
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<h3 class="hd hd-2">Video</h3>
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<div class="wrapper-problem-response" tabindex="-1" aria-label="Question 1" role="group"><p>The Space Shuttle main engines could have been more (chemically) efficient if the hydrogen/oxygen ratio had been &#8220;stoichiometric&#8221; (i.e. the same mass ratio as in the chemical formula). </p>
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<legend id="d89a1c01ccbf462884746e44c10e1595_2_1-legend" class="response-fieldset-legend field-group-hd">In fact, the hydrogen/oxygen ratio used in the SSMEs was ____ the ratio at which hydrogen and oxygen would combine to make water.</legend>
<p class="question-description" id="description_d89a1c01ccbf462884746e44c10e1595_1_1">The value of the ratio (according to this problem) is evaluated as {Hydrogen Amount}/{Oxygen Amount}, so a mixture ratio of 50 hydrogen atoms to 1 oxygen atom would be LARGER than a mixture ratio of 20 hydrogen atoms to 1 oxygen atom. </p>
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<legend id="60ee71252808418d97f0325ecd3159eb_2_1-legend" class="response-fieldset-legend field-group-hd">According to Wayne Hale, what was the mean reason a stoichiometric ratio of hydrogen/oxygen was NOT used in the SSMEs?</legend>
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<p>There are four types of potential aborts once the Space Shuttle has launched. Enter a number from 1 to 4 after each launch abort type in sequential order for when they become available, starting at liftoff.</p>
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<label class="problem-group-label" for="input_9388df763a10421791dea495ccd34917_2_1" id="label_9388df763a10421791dea495ccd34917_2_1">Wayne Hale mentions one system that is officially not considered critical, but he thinks it should have been category one critical. What is that system?</label>
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