Phy 2004 Lectures 1,2,3,4,5

Phy 2004 Lectures 1,2,3,4,5 - Chap 2#43 Y = Vit(1/2)at2(1...

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Chap. 2 #43 Y = V i t +(1/2)at 2 ……………………………………………………… (1) At end Y = -30 m (below origin) acceleration a = -g= -9.8m/s2 Put in Eq n (1) -30=V i 3 (1/2)(9.8) 9 V i = (4.9)3 = 4.7 m/s
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Chap 2. # 35 Red speed constant = 90 km/h = 25 m/s Blue does not start until 5 seconds after red passes, D=(5)(250)=125 m Need to find t, then calculate distances NOTE: X blue = X red + 125 ………………………… .Eq n (1) X red = 25 t X blue = (1/2) at 2 = (1/2)5t 2 = 2.5t 2 Use Eq n (1) 2.5 t 2 = 25t +125, or t 2 = 10t + 50 , or t=5  (75) ( -ve sign non-physical)=5 +8.7 = 13.7s X red = 25 t =341.5 m X blue = 466.5 m
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PHY 2004 : Applied Physics in our world today Neil S. Sullivan Fall 2010 Fall 2010 NPB Rm 2235 Textbook: Email: [email protected] Tel. 352-846-3137 Class meets: M W F (Period 8) 3:00 -3:50 PM NPB 1001 Office Hours: M W F (Period 4) 10:40 – 11:30 AM Technical Physics NPB 2235 F. Bueche & D. Wallach (4 th ed., J. Wiley & Sons, 1994)
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Phy 2004 Lectures 1,2,3,4,5 - Chap 2#43 Y = Vit(1/2)at2(1...

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