题库网 (tiku.one)

 找回密码
 立即注册

手机扫一扫,访问本页面

开启左侧

IB MAI HL Calculus Topic 5.4 Differential Equations (id: dd9aeb023)

[复制链接]
admin 发表于 2024-3-22 18:05:08 | 显示全部楼层 |阅读模式
本题目来源于试卷: IB MAI HL Calculus Topic 5.4 Differential Equations,类别为 IB数学

[填空题]
Suppose the populationh rubkz1l6*q 3 size of a bee colony in units of 10 is N . At timeum5hj+w-j tsc t1w g/j88;mm uv-qx2n t weeks, the rate of chgxt -+muu8 jt8 wcjq 5m 1vs2mjhn/;w-ange of the population can be modelled by the differential equation $\frac{\mathrm{d} N}{\mathrm{~d} t}$=0.4 N-0.8 t
1. Given that N=a+b t , for a, b $\in \mathbb{R}$ , is a solution to the differential equation for a particular initial population, find the values of a and b .
a=  .
The slope field for the differential equation is shown below

2. Sketch on the slope diagram:
1. the line N=a+b t
2. the trajectory of the population if at t=0, N=3 .
3. Find the least value for N at t=0 that will ensure the population does not become extinct.
N=  .
A beekeeper measuring the population N determines it will reach a maximum after two and a half weeks and then will begin to decline.
4. Write down an approximation for N at that time.

The beekeeper decides to introduce more bees at t=2.5 .
5. If the model remains valid, find the least number of bees N that needs to be added in order for the population to continue to increase in size as time increases.
Therefore, the beekeeper needs to increase N by   .
Suppose that N=80 after 4 weeks.
6. Estimate N after 5 weeks by using Euler's method with a step size of 0.2 .
N≈  .




参考答案:
空格1: 5空格2: 5空格3: 5空格4: 113


本题详细解析:

微信扫一扫,分享更方便

帖子地址: 

回复

使用道具 举报

您需要登录后才可以回帖 登录 | 立即注册

本版积分规则

浏览记录|使用帮助|手机版|切到手机版|题库网 (https://tiku.one)

GMT+8, 2024-12-26 03:48 , Processed in 0.053445 second(s), 28 queries , Redis On.

搜索
快速回复 返回顶部 返回列表