6 - Today Announcements: HW#3 is due Wed. (tomorrow) at 8...

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ISP209s10 Lecture 6 -1- Today • Announcements: – HW#3 is due Wed. (tomorrow) at 8 am. – Look for two new extra credit problems on CAPA – HW#4 will be due next Wednesday as usual No class on Thursday 2/4 Exam #1 Thurs. Feb. 11 Exam Review in class on Tuesday 2/9
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ISP209s10 Lecture 6 -2- Reminder about the exam • In this room on Thurs. Feb. 11 • You MUST bring a #2 pencil and a calculator. • You will be allowed to bring 1 page of notes (front and back, regular size notebook paper)
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ISP209s10 Lecture 6 -3- A tricky HW problem You are here. You want to be here. A helpful demonstration (note: If fails in Firefox, try Safari or Explorer) http://mysite.verizon.net/vzeoacw1/velocity_composition.html
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ISP209s10 Lecture 6 -4- Example of the use of vectors Velocity of stream Rowing velocity River Velocity you would see from the Shore
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ISP209s10 Lecture 6 -5- How long to cross the river? Velocity of stream Rowing velocity River ACROSS speed rowing river the across distance time = The rowing speed ACROSS is the magnitude of the boat’s velocity directed toward the opposite bank. The blue line is the rowing Speed ACROSS
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ISP209s10 Lecture 6 -6- Vectors Which will get you across faster, B or D ? B D
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ISP209s10 Lecture 6 -7- Vectors Answer: The one with the larger component that points straight across ( “East”). In this case, choice D. B D North East
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ISP209s10 Lecture 6 -8- Vectors Question:What about the river velocity? Claim: It doesn’t matter since it doesn’t effect the rowing velocity Component that points in the East direction B D North East
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ISP209s10 Lecture 6 -9- Vectors river
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ISP209s10 Lecture 6 -10- Vectors river
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ISP209s10 Lecture 6 -11- Vectors Which way will get you across the river in the quickest time, the Red or Blue choice?
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ISP209s10 Lecture 6 -12- Vectors The rowing speed is the magnitude of the component of the boat’s total velocity that is directed toward the opposite bank (I.e., East ). North East ACROSS speed rowing river the across distance time =
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-13- Vectors The rowing speed is the magnitude of the component of the boat’s total velocity that is directed toward the opposite bank (I.e., East ). North
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6 - Today Announcements: HW#3 is due Wed. (tomorrow) at 8...

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