第 12 类 RD Sharma 解决方案 - 第 22 章微分方程 - 练习 22.1 |设置 1
确定下列微分方程的阶和阶。还要说明它是线性的还是非线性的(问题 1-13)
问题 1。 ![由 QuickLaTeX.com 渲染 \frac{d^3x}{dt^3}+\frac{d^2x}{dt^2}+(\frac{dx}{dt})^2=e^t](https://mangodoc.oss-cn-beijing.aliyuncs.com/geek8geeks/Class_12_RD_Sharma_Solutions-_Chapter_22_Differential_Equations_%E2%80%93_Exercise_22.1_%7C_Set_1_0.jpg)
解决方案:
We have,
Order of function:
The Highest order of derivative of function is 3 i.e.,
So, the order of derivative is equal to 3.
Degree of function:
As the power of the highest order derivative of function is 1 (i.e., power of is 1)
So, degree of function is 1.
Linear or Non-linear:
The given equation is non-linear.
问题2。 ![由 QuickLaTeX.com 渲染 \frac{d^2y}{dx^2}+4y=0](https://mangodoc.oss-cn-beijing.aliyuncs.com/geek8geeks/Class_12_RD_Sharma_Solutions-_Chapter_22_Differential_Equations_%E2%80%93_Exercise_22.1_%7C_Set_1_4.jpg)
解决方案:
We have,
Order of function:
As the highest order of derivative of function is 2.(i.e.,)
So, Order of the function is equal to 2.
Degree of function:
As the power of the highest order derivative of the function is 1(i.e., power of is 1)
So, Degree of the function is equal to 1.
Linear or Non-linear:
The given equation is linear.
问题 3。 ![由 QuickLaTeX.com 渲染 (\frac{dy}{dx})^2+\frac{1}{(\frac{dy}{dx})}=2](https://mangodoc.oss-cn-beijing.aliyuncs.com/geek8geeks/Class_12_RD_Sharma_Solutions-_Chapter_22_Differential_Equations_%E2%80%93_Exercise_22.1_%7C_Set_1_8.jpg)
解决方案:
We have,
Order of function:
As the highest order of derivative of function is 1 (i.e., )
So, Order of the function is equal to 1.
Degree of function
As the power of the highest order derivative of the function is 3 (i.e., power of dy/dx is 3)
So, the degree of the function is equal to 3.
Linear or Non-linear:
The given equation is non-linear.
问题 4。 ![由 QuickLaTeX.com 渲染 \sqrt{[1+(\frac{dy}{dx})^2]} =(c\frac{d^2y}{dx^2})^\frac{1}{3}](https://mangodoc.oss-cn-beijing.aliyuncs.com/geek8geeks/Class_12_RD_Sharma_Solutions-_Chapter_22_Differential_Equations_%E2%80%93_Exercise_22.1_%7C_Set_1_13.jpg)
解决方案:
We have,
On squaring both side, we get
On cubing both side, we get
Order of function:
As the highest order of derivative of function is 2 (i.e.,
So, Order of the function is equal to 2.
Degree of function:
As the power of the highest order derivative of the function is 2. (i.e., power of is 2)
So, the Degree of the function is equal to 2.
Linear or Non-linear:
The given equation is non-linear.
问题 5。 ![由 QuickLaTeX.com 渲染 \frac{d^2y}{dx^2}+(\frac{dy}{dx})^2+xy=0](https://mangodoc.oss-cn-beijing.aliyuncs.com/geek8geeks/Class_12_RD_Sharma_Solutions-_Chapter_22_Differential_Equations_%E2%80%93_Exercise_22.1_%7C_Set_1_20.jpg)
解决方案:
We have,
Order of function:
As the highest order of derivative of function is 2
So, Order of the function is equal to 2.
Degree of function:
As the power of the highest order derivative of function is 1 (i.e., power of is 1)
So, the Degree of the function is equal to 1.
Linear or Non-linear:
The given equation is non-linear.
问题 6。 ![由 QuickLaTeX.com 渲染 3\sqrt{\frac{d^2y}{dx^2}}= \sqrt\frac{dy}{dx}](https://mangodoc.oss-cn-beijing.aliyuncs.com/geek8geeks/Class_12_RD_Sharma_Solutions-_Chapter_22_Differential_Equations_%E2%80%93_Exercise_22.1_%7C_Set_1_23.jpg)
解决方案:
We have,
On cubing both side, we get
On squaring both side, we get
Order of function:
As the highest order of derivative of function is 2 (i.e., )
So, the Order of the function is equal to 2.
Degree of function:
As the power of the highest order derivative of the function is 2(i.e., power of is 2)
So, the Degree of the function is equal to 2.
Linear or Non-linear:
The given equation is non-linear.
问题 7。 ![由 QuickLaTeX.com 渲染 \frac{d^4y}{dx^4}=[c+(\frac{dx}{dy})^2]^\frac{3}{2}](https://mangodoc.oss-cn-beijing.aliyuncs.com/geek8geeks/Class_12_RD_Sharma_Solutions-_Chapter_22_Differential_Equations_%E2%80%93_Exercise_22.1_%7C_Set_1_29.jpg)
解决方案:
We have,
On squaring both side, we get
Order of function:
The highest order of derivative of function is 4 (i.e., )
So, the order of the derivative is equal to 4.
Degree of function:
As the power of the highest order derivative of the function is 2 (i.e., power of is 2)
So, the degree of function is 2.
Linear or Non-linear:
The given equation is non-linear.
问题 8: ![由 QuickLaTeX.com 渲染 x+\frac{dy}{dx}=\sqrt{1+(\frac{dy}{dx})^2}](https://mangodoc.oss-cn-beijing.aliyuncs.com/geek8geeks/Class_12_RD_Sharma_Solutions-_Chapter_22_Differential_Equations_%E2%80%93_Exercise_22.1_%7C_Set_1_36.jpg)
解决方案:
We have,
On squaring both side, we have
Order of function:
As the highest order of derivative of function is 1.
So, the Order of the function is equal to 1.
Degree of function:
As the power of the highest order derivative of the function is 1.
So, the degree of the function is equal to 1.
Linear or Non-linear:
The given equation is linear.
问题 9: ![由 QuickLaTeX.com 渲染 y\frac{d^2x}{dy^2}=y^2+1](https://mangodoc.oss-cn-beijing.aliyuncs.com/geek8geeks/Class_12_RD_Sharma_Solutions-_Chapter_22_Differential_Equations_%E2%80%93_Exercise_22.1_%7C_Set_1_42.jpg)
解决方案:
We have,
Order of function:
As the highest order of derivative of function is 2 (i.e.,)
So, order of derivative is equal to 2.
Degree of function:
As the power of the highest order derivative of the function is 1 (i.e., power of is 1)
So, the Degree of the function is equal to 1.
Linear or Non-linear:
The given equation is linear.
问题 10: ![由 QuickLaTeX.com 渲染 s^2\frac{d^2t}{ds^2}+st\frac{dt}{ds}=s](https://mangodoc.oss-cn-beijing.aliyuncs.com/geek8geeks/Class_12_RD_Sharma_Solutions-_Chapter_22_Differential_Equations_%E2%80%93_Exercise_22.1_%7C_Set_1_47.jpg)
解决方案:
We have,
Order of function:
As the highest order of derivative of the function is 2.
So, the Order of the function is equal to 2.
Degree of function:
As the power of the highest order derivative of the function is 1 (i.e., power of is 1)
So, the Degree of the function is equal to 1.
Linear or Non-linear:
The given equation is non-linear.
问题 11: ![由 QuickLaTeX.com 渲染 x^2(\frac{d^2y}{dx^2})^3+y(\frac{dy}{dx})^4+y^4=0](https://mangodoc.oss-cn-beijing.aliyuncs.com/geek8geeks/Class_12_RD_Sharma_Solutions-_Chapter_22_Differential_Equations_%E2%80%93_Exercise_22.1_%7C_Set_1_50.jpg)
解决方案:
We have,
Order of function:
As the highest order of derivative of the function is 2
So, the Order of the function is equal to 2.
Degree of function:
As the power of the highest order derivative of the function is 3. (i.e., power of is 3)
So, the degree of the function is equal to 3.
Linear or Non-linear:
The given equation is non-linear.
问题 12: ![由 QuickLaTeX.com 渲染 \frac{d^3y}{dx^3}+(\frac{d^2y}{dx^2})^3+(\frac{dy}{dx})+4y=siny](https://mangodoc.oss-cn-beijing.aliyuncs.com/geek8geeks/Class_12_RD_Sharma_Solutions-_Chapter_22_Differential_Equations_%E2%80%93_Exercise_22.1_%7C_Set_1_53.jpg)
解决方案:
We have,
Order of function:
As the highest order of derivative of the function is 3
So, the Order of the function is equal to 3.
Degree of function:
As the power of the highest order derivative of the function is 1.(i.e., power of is 1)
So, the Degree of the function is equal to 1.
Linear or Non-linear:
The given equation is non-linear.
问题 13: ![由 QuickLaTeX.com 渲染 (xy^2+x)dx+(y-x^2y)dy=0](https://mangodoc.oss-cn-beijing.aliyuncs.com/geek8geeks/Class_12_RD_Sharma_Solutions-_Chapter_22_Differential_Equations_%E2%80%93_Exercise_22.1_%7C_Set_1_56.jpg)
解决方案:
We have,
Order of function:
As the highest order of derivative of the function is 1
So, the Order of the function is equal to 1.
Degree of function:
As the power of the highest order derivative of the function is 1. (i.e., power of dy/dx is 1)
So, the Order of the function is equal to 1.
Linear or Non-linear:
The given equation is non-linear.