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IB MAI HL Geometry & Trigonometry Topic 3.4 Trigonometric Functions (id: 8a14280

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admin 发表于 2024-2-9 17:11:34 | 显示全部楼层 |阅读模式
本题目来源于试卷: IB MAI HL Geometry & Trigonometry Topic 3.4 Trigonometric Functions,类别为 IB数学

[填空题]
PM2.5 particles are tiny qpk kr1,ynv :.air pollutants with a diameter of 2.5 micr/kf3w h,o-3n *dspynp ometres or less. In comparisondh, ons /p3 ypk3wn*f-, the average diameter of a human hair is about 70 micrometresmicrometres. Air pollution from diesel & petrol engines form part of PM2.5 emissions and of particularparticular concern due to the health impacts.

During a particular working day, the rate of PM2.5 emissions, in grams per second, from all road vehicles in Beijing, China is modelled by the function
E(t)=6sin($\frac{π​}{6}$t−$\frac{5π​}{6}$)+9,0≤t≤24,
where t is the elapsed time, in hours, since midnight.
1.Find the maximum rate of PM2.5 emissions during the day in Beijing, China.$E_{max}$ =    g/sec
2.Find the times at which the maximum rate of PM2.5 emissions occur during the day. t =      




参考答案:
空格1: 15±2%空格2: 8±2%空格3: 20±2%


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