Bài 4: Khối lượng riêng. Áp suất chất lỏng
Hướng dẫn giải Vận dụng 1 (Trang 61 SGK Vật lý 10, Bộ Cánh diều)
<p>T&iacute;nh khối lượng của một khối đ&aacute; hoa cương dạng h&igrave;nh hộp chữ nhật c&oacute; k&iacute;ch thước 2,0 m x 3,0 m x 1,5 m.</p> <p><strong>Lời giải:</strong></p> <p>Thể t&iacute;ch của khối đ&aacute; hoa cương:&nbsp;<span id="MathJax-Element-1-Frame" class="mjx-chtml MathJax_CHTML" style="box-sizing: border-box; display: inline-block; line-height: 0; text-indent: 0px; text-align: left; text-transform: none; font-style: normal; font-weight: normal; font-size: 21.78px; letter-spacing: normal; overflow-wrap: normal; word-spacing: normal; white-space: nowrap; float: none; direction: ltr; max-width: none; max-height: none; min-width: 0px; min-height: 0px; border: 0px; margin: 0px; padding: 1px 0px; position: relative;" tabindex="0" role="presentation" data-mathml="&lt;math xmlns=&quot;http://www.w3.org/1998/Math/MathML&quot;&gt;&lt;mi&gt;V&lt;/mi&gt;&lt;mo&gt;=&lt;/mo&gt;&lt;mn&gt;2.3.1&lt;/mn&gt;&lt;mo&gt;,&lt;/mo&gt;&lt;mn&gt;5&lt;/mn&gt;&lt;mo&gt;=&lt;/mo&gt;&lt;mn&gt;9&lt;/mn&gt;&lt;mtext&gt;&amp;#x2009;&lt;/mtext&gt;&lt;msup&gt;&lt;mi&gt;m&lt;/mi&gt;&lt;mn&gt;3&lt;/mn&gt;&lt;/msup&gt;&lt;/math&gt;"><span id="MJXc-Node-1" class="mjx-math" aria-hidden="true"><span id="MJXc-Node-2" class="mjx-mrow"><span id="MJXc-Node-3" class="mjx-mi"></span></span></span><math xmlns="http://www.w3.org/1998/Math/MathML"><mi>V</mi><mo>=</mo><mn>2</mn><mo>.</mo><mn>3</mn><mo>.</mo><mn>1</mn><mo>,</mo><mn>5</mn><mo>=</mo><mn>9</mn><msup><mi>m</mi><mn>3</mn></msup></math><math xmlns="http://www.w3.org/1998/Math/MathML"><msup><mn></mn></msup></math></span></p> <p>Khối lượng ri&ecirc;ng của đ&aacute; hoa cương l&agrave;&nbsp;<span id="MathJax-Element-2-Frame" class="mjx-chtml MathJax_CHTML" style="box-sizing: border-box; display: inline-block; line-height: 0; text-indent: 0px; text-align: left; text-transform: none; font-style: normal; font-weight: normal; font-size: 21.78px; letter-spacing: normal; overflow-wrap: normal; word-spacing: normal; white-space: nowrap; float: none; direction: ltr; max-width: none; max-height: none; min-width: 0px; min-height: 0px; border: 0px; margin: 0px; padding: 1px 0px; position: relative;" tabindex="0" role="presentation" data-mathml="&lt;math xmlns=&quot;http://www.w3.org/1998/Math/MathML&quot;&gt;&lt;mi&gt;&amp;#x3C1;&lt;/mi&gt;&lt;mo&gt;=&lt;/mo&gt;&lt;mn&gt;2750&lt;/mn&gt;&lt;mtext&gt;&amp;#x2009;&lt;/mtext&gt;&lt;mi&gt;k&lt;/mi&gt;&lt;mi&gt;g&lt;/mi&gt;&lt;mo&gt;/&lt;/mo&gt;&lt;msup&gt;&lt;mi&gt;m&lt;/mi&gt;&lt;mn&gt;3&lt;/mn&gt;&lt;/msup&gt;&lt;/math&gt;"><span id="MJXc-Node-14" class="mjx-math" aria-hidden="true"><span id="MJXc-Node-15" class="mjx-mrow"><span id="MJXc-Node-16" class="mjx-mi"></span></span></span><math xmlns="http://www.w3.org/1998/Math/MathML"><mi>&#961;</mi><mo>=</mo><mn>2750</mn><mi>k</mi><mi>g</mi><mo>/</mo><msup><mi>m</mi><mn>3</mn></msup></math><math xmlns="http://www.w3.org/1998/Math/MathML"><msup><mn></mn></msup></math></span></p> <p>N&ecirc;n khối lượng của khối đ&aacute; hoa cương tr&ecirc;n l&agrave;:</p> <p><span id="MathJax-Element-3-Frame" class="mjx-chtml MathJax_CHTML" style="box-sizing: border-box; display: inline-block; line-height: 0; text-indent: 0px; text-align: left; text-transform: none; font-style: normal; font-weight: normal; font-size: 21.78px; letter-spacing: normal; overflow-wrap: normal; word-spacing: normal; white-space: nowrap; float: none; direction: ltr; max-width: none; max-height: none; min-width: 0px; min-height: 0px; border: 0px; margin: 0px; padding: 1px 0px; position: relative;" tabindex="0" role="presentation" data-mathml="&lt;math xmlns=&quot;http://www.w3.org/1998/Math/MathML&quot;&gt;&lt;mi&gt;m&lt;/mi&gt;&lt;mo&gt;=&lt;/mo&gt;&lt;mi&gt;&amp;#x3C1;&lt;/mi&gt;&lt;mi&gt;V&lt;/mi&gt;&lt;mo&gt;=&lt;/mo&gt;&lt;mn&gt;2750.9&lt;/mn&gt;&lt;mo&gt;=&lt;/mo&gt;&lt;mn&gt;24750&lt;/mn&gt;&lt;mtext&gt;&amp;#x2009;&lt;/mtext&gt;&lt;mi&gt;k&lt;/mi&gt;&lt;mi&gt;g&lt;/mi&gt;&lt;mo&gt;=&lt;/mo&gt;&lt;/math&gt;"><span id="MJXc-Node-26" class="mjx-math" aria-hidden="true"><span id="MJXc-Node-27" class="mjx-mrow"><span id="MJXc-Node-28" class="mjx-mi"></span></span></span><math xmlns="http://www.w3.org/1998/Math/MathML"><mi>m</mi><mo>=</mo><mi>&#961;</mi><mi>V</mi><mo>=</mo><mn>2750</mn><mo>.</mo><mn>9</mn><mo>=</mo><mn>24750</mn><mi>k</mi><mi>g</mi></math><span class="MJX_Assistive_MathML" role="presentation"><math xmlns="http://www.w3.org/1998/Math/MathML"><mi></mi><mo>=</mo></math></span></span>24,750 tấn</p>
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