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secondary 3 | A Maths
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secondary 3 chevron_right A Maths chevron_right Singapore

pls help

Date Posted: 2 months ago
Views: 37
J
J
2 months ago
Altitude doubles means that the altitude is now 2h.

Original wind speed = 2 ln 100h

New wind speed

= 2 ln 100(2h)

= 2 ln 200h

Increase in wind speed

= 2 ln 200h - 2 ln 100h

= 2 (ln 200h - ln 100h)

= 2 ln (200h/100h)

= 2 ln 2

= ln 2²

= ln 4


Alternatively,


New wind speed

= 2 ln 100(2h)

= 2 ln 100h(2)

= 2 ln 100h + 2 ln 2

= 2 ln 100h + ln 2²

= 2 ln 100h + ln 4
= Original wind speed + ln 4

Increase in wind speed = ln 4
J
J
2 months ago
Wind speed

= 2 ln 100h

= 2 logₑ100h

= 2 lg 100h / lg e

= 2/lg e (lg 100h)

= 2/lg e (lg 100 + lg h)

= 2/lg e (lg 10² + lg h)

= 2/lg e (2lg 10 + lg h)

= 2/lg e (2 + lg h)


Alternatively,


2 ln 100h

= 2 (ln 100 + ln h)

= 2 (logₑ100 + logₑ h)

= 2 (lg 100 / lg e + lg h / lg e)

= 2/lg e (lg 100 + lg h)

= 2/lg e (lg 10² + lg h)

= 2/lg e (2lg 10 + lg h)

= 2/lg e (2 + lg h)

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