自主录题

自主录题一试题标签

省市校区

阶段科目

题型题类

年份题源

存放类型

已选考点

难度系数

一星二星三星四星五星

在线训练

是否

自主录题一试题内容

试题内容

<span style="font-size:10.5pt"><span style="line-height:150%"><span style="font-family:Calibri"><span style="line-height:150%"><span style="font-family:宋体">图示为“长征六号”运载火箭，它首次采用了我国最新研制的大推力液氧煤油发动机。</span></span></span></span></span><br />
<span style="font-size:10.5pt"><span style="line-height:150%"><span style="font-family:Calibri"><span style="line-height:150%"><span style="font-family:宋体">①煤油燃烧过程中，其热值大小<u>　</u></span></span><u>  </u><u>　</u><span style="line-height:150%"><span style="font-family:宋体">；</span></span></span></span></span><br />
<span style="font-size:10.5pt"><span style="line-height:150%"><span style="font-family:Calibri"><span style="line-height:150%"><span style="font-family:宋体">②火箭起飞时，煤油燃烧产生大量高温高压的燃气，燃气对火箭的推力达1.2×10<sup>6</sup>N，这个力可举起质量为<u>　</u></span></span><u>  </u><u>　</u><span style="line-height:150%"><span style="font-family:宋体">t的物体（g取10N/kg）；</span></span></span></span></span><br />
<span style="font-size:10.5pt"><span style="line-height:150%"><span style="font-family:Calibri"><span style="line-height:150%"><span style="font-family:宋体">③燃气对火箭做功，燃气的内能会<u>　</u></span></span><u>  </u><u>　</u><span style="line-height:150%"><span style="font-family:宋体">（选填“增大”、“减小”或“不变”）。</span></span></span></span></span><br />
<img src="/uploads/meth/20210527/0f664dffcd2dd3bb1efccd380fde81cd.png" style="float: right; width: 122px; height: 122px;" /><br />

题型种类

选择题 非选择题

选项效果

一行4选项 一行2选项 一行1选项

选项内容

A B C D E F G H

选择答案

自主录题一试题解答

试题解答

<span style="font-size:10.5pt"><span style="line-height:150%"><span style="font-family:Calibri"><span style="line-height:150%"><span style="font-family:宋体">解：</span></span></span></span></span><br />
<span style="font-size:10.5pt"><span style="line-height:150%"><span style="font-family:Calibri"><span style="line-height:150%"><span style="font-family:宋体">①热值是燃料的一种特性，它只与燃料的种类有关，所以煤油燃烧过程中，其热值大小不变；</span></span></span></span></span><br />
<span style="font-size:10.5pt"><span style="line-height:150%"><span style="font-family:Calibri"><span style="line-height:150%"><span style="font-family:宋体">②火箭起飞时，燃气对火箭的推力与卫星对火箭的压力是一对作用力与反作用力，所以火箭承受的压力为1.2×10<sup>6</sup>N，即物体的重力G=1.2×10<sup>6</sup>N；</span></span></span></span></span><br />
<span style="font-size:10.5pt"><span style="line-height:150%"><span style="font-family:Calibri"><span style="line-height:150%"><span style="font-family:宋体">根据G=mg可知，这个力可举起质量为m=</span></span></span></span></span><img height="36" src="/uploads/meth/20210527/f771e0a408d6844971826bed1cd2bfc8.png" width="13" /><span style="font-size:10.5pt"><span style="line-height:150%"><span style="font-family:Calibri"><span style="line-height:150%"><span style="font-family:宋体">=</span></span></span></span></span><img height="42" src="/uploads/meth/20210527/910956f084210251696d344bfea53589.png" width="82" /><span style="font-size:10.5pt"><span style="line-height:150%"><span style="font-family:Calibri"><span style="line-height:150%"><span style="font-family:宋体">=1.2×10<sup>5</sup>kg=120t；</span></span></span></span></span><br />
<span style="font-size:10.5pt"><span style="line-height:150%"><span style="font-family:Calibri"><span style="line-height:150%"><span style="font-family:宋体">③燃气对火箭做功，内能转化为机械能，所以燃气的内能会减小。</span></span></span></span></span><br />
<span style="font-size:10.5pt"><span style="line-height:150%"><span style="font-family:Calibri"><span style="line-height:150%"><span style="font-family:宋体">故答案为：①不变；②120；③减小。</span></span></span></span></span><br />

自主录题一试题点评

智能点评

手动点评