IB MAI HL Functions Topic 2.2 Applications of Functions (id: e68259a97)

本题目来源于试卷: IB MAI HL Functions Topic 2.2 Applications of Functions，类别为 IB数学

[填空题]
PM2.5 particles are tnm k;)s-tzc 3liz;nx.m.fc4t nohd..6smg8e s -to*br ny air pollutants with a diameter of 2.5 micrometres or less. In comparison, the armx 8tfn.g*e;obs.hz d.6sctno.4 m -verage 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 PM2.52.5 emissions, in grams per second, from all road vehicles in Beijing, China is modelled by the function
$E(t)=6sin(\frac{\pi }{6}t-\frac{5\pi }{6})+9,0$≤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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