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December 18, 2014

December 18, 2014

Posted by **Anonymous** on Sunday, April 5, 2009 at 8:58pm.

D(t)=12+Asin(((2pi)/(365))(t-80))

where A depends only on the latitude (and not t). for latitude 30 degress, A is about 2.3

1. When is the number of hours of daylight the greatest?

2.When is the number of hours of daylight the least?

3. When is the number of hours of daylight increasing at a rate of 2 minutes per day?

4. when is the number of hours of daylight decreasing at a rate of 2 min per day?

Can any one help me with any of these?

thanks a lot!

- calculus -
**bobpursley**, Sunday, April 5, 2009 at 9:05pmrepeat. I forgot on the last post, on 4 set dD/dt to minus 2/60.

- calculus -
**Anonymous**, Sunday, April 5, 2009 at 9:29pmthank you so much I appreciate this

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