# User:CeryM11

Hello there, I'm a pupil of the Gisela Gym, munich I study physics with mr Oswald as my teacher. I'm 16 years old and like drawing and dancing. Hope you'll be nice to me ;-)

1.9 Rückwärtsgang

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

 $v=\frac {-168m} {12,5s}$
$v=-13.4\frac {m} {s}$


b)$x(t)=x_0+v*\Delta {t}$

 $x(t)=168m-13.4\frac {m} {s} * 173s$
$x(t)=2.16\frac {km} {h}$


c)$t=\frac {x(t)-x_0} {v}$

$\frac {-6200m-168m} {-13.4\frac {m} {s}}$
$=473.8s$


4.1: Brummi, Teil 2

c)$W_a =\frac {m} {2}* v^2$

 $17500kg * (13.89\frac {m} {s})^2 =3.4MJ$


d1)$P=\frac {W} {t}$

  $\frac {3375750J} {40s}=84393.75W=84.4kW$


d2)$P=\frac {W_a +W_R} {t}$

  $341.9kW$


d3)$W_R =F_R *x=$

  $10.3MJ$


4.6: Energievergleich

a) $E_Kin=\frac {1} {2}m*v^2$

  $\frac {1} {2}*2000kg*13.9\frac {m} {s}=$

$193kJ$


b) $E_Pot =m*g*h$

  $1.9MJ$


c) $E_Kin =\frac {1} {2}*m*v^2$

  $2MJ$


4.13: Bilderbuchstart

a)$F=m*g=$

 $1.77MN$


b)$p=m*v$

 $890kg*5000\frac {m} {s}=$

$4450000$

 $F=\frac {p} {\Delta {t}}=$
$4.45MN$


c)$a=\frac{F_S - F_G} {m}$

 $\frac {(4.45-1.77)MN} {180000kg}=$

 $15\frac {m} {s}$