Mechanics11/Seite4/Loesung1.11

= Gruppe A =

a) Rechtswert: Zeit t, Hochwert: Ortskoordinate x

(1) t1

(2) t2

(3) t3

(4) t4

(5) Schall 1

(6) Schall 2

(7) Auto

(8) x0

= Schülerbeitrag =

b)

x1= vs*$$\frac {\Delta t}{2} $$

$$\Delta t$$ = t2-t1 = 30s

x1= 240$$\frac {m}{s} $$*15s= 51m

x2= 170 m

$$\Delta t$$= 4,30s-0,80s= 3,50s

v= $$\frac {\Delta x}{\Delta t} $$= $$\frac {119m}{3,50s} $$= 34$$\frac {m}{s} $$

c)

x(t)= x0+v*t

x0= x-v*t

= x1-v*t5 = 51m-34$$\frac {m}{s} $$*0,80s= 24m

--Sayuri 13:09, 19 October 2007 (CEST)

--Lenny 13:07, 16 November 2007 (CET)

= Gruppe B, Schülerbeitrag =



b)

x1 = vs*$$\frac {\Delta t}{2} $$

Nebenrechnung:

$$\Delta t$$ = t2-t1

$$\Delta t$$ = 2,80s-1,80s

$$\Delta t$$ = 1s

x1 = 340 $$\frac {m}{s} $$ * 0,5s

x1 = 170 m

x1 = vs*$$\frac {\Delta t}{2} $$

Nebenrechnung:

$$\Delta t$$ = t4-t3

$$\Delta t$$ = 4,95s-4,65s

$$\Delta t$$ = 0,30s

x2 = 340 $$\frac {m}{s} $$ * 1,5s

x2 = 51m

v = $$\frac {\Delta x}{\Delta t}

v = \frac {119m}{2,50s} $$

v = 47,6$$\frac {m}{s} $$

v = 171$$\frac {km}{h} $$

c)

x = x0 + v*t

x0 = x - v*t

x0 = 170m - 47,6 $$\frac {m}{s} $$ * 2,5s

x0 = 60,52m

von Sofiya und Christina 11b