The wind speed at a weather monitoring station varies according to the function
where
- What is the amplitude and the period of
? (2 marks)
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- What are the maximum and minimum wind speeds at the weather monitoring station? (1 mark)
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- Find
, correct to four decimal places. (1 mark)
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- Find the average value of
for the first 60 minutes, correct to two decimal places. (2 marks)
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A sudden wind change occurs at 10 am. From that point in time, the wind speed varies according to the new function
where
- Find the smallest value of
, correct to four decimal places, such that and are equal and are both increasing at 10 am. (2 marks)
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- Another possible value of
was found to be 31.4358 Using this value of
, the weather monitoring station sends a signal when the wind speed is greater than 38 km/h. i. Find the value of
at which a signal is first sent, correct to two decimal places. (1 mark)
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ii. Find the proportion of one cycle, to the nearest whole percent, for which
. (2 marks)
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- Let
and .
The transformationmaps the graph of onto the graph of . State the values of
, , and , in terms of where appropriate. (3 marks)
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