Tuesday, May 5, 2009
Homework due 05/05/09
You have the worksheet that I gave you in class. Remember, if it takes you longer then that time is worth spending now. Take more time now and you will naturally be able to sort this stuff out with more ease later. Check the conference folder early in the morning or very late at night for the answers to the worksheet.
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9 comments:
Two questions. For number 7b, could someone explain to me what is meant by angular speed? Second, for 8b, are there ratios that can help or am I missing something very basic?
for 8b you can use your straight edge by putting it on the given value and it will point to the radian/ answer
how do you do 7 a&b?
For 7a, you need to first find the circumference of the wheels and how many feet in a mile. Then you may proceed to calculate how many revolutions the wheels spin in a mile, and then in an hour at 65 mph, and then you can figure out, from that, the number of revolutions per minute at 65 mph. Does that make sense?
I also am confused on what "angular speed" is, and how it can be in radians per minute...
Oh, this webpage might help with angular speed. At least, the equation does. I haven't completely read it through yet, but what I have read seems helpful. http://blade3891.tripod.com/id9.html
How do you get arc length with given radian and degree measure? I just can't remember.
Okay, angular speed is a very simple thing and you might complicate it for yourself. Ask yourself, what is speed. We know it is distance per time, from the usual definition. So what is wrong with having angle per time? In other words, the units radians per minute should automatically indicate what angular speed means. It is very much akin to the idea of revolutions per minute. Find out how much time it takes for 2Pi radians to occur. Then see how you could get how many radians per minute.
Number 8 is asking very simple questions and is really testing whether you understand what these trig function are doing. You have pretty much been given a unit circle but not with the usual special angle markings.
For Lauren's question, degree measure will just give you the central angle. The radius will help you find the circumference. Then it's all about ratios... figure it out!
I remember now! Sorry about that.
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