# User:JanabananaM11

Hi my name is jana. I am a pupil from the GiSubscript textselagymnasium in Munich and I am in a physikclass leaded by Mr. Osswald. cheers
and I like to move, it move it!

2.9
x(t) = 0,5 a * t2
t = v/a
x(t) = 0,5*a*(v/a)2 = 0,5 * v2/a = v2/2*x(t)
a= 3,6 *105 m/s2
t= v/a = 2,1 * 10-3sSubscript text

3.19 Geg: m=52 kg µ= 0,06 $\alpha$=22°C x=25m

a) Fg= m * g = 52kg * 9,81 N/kg= 5,1 * 102N

  Fh= sin$\alpha$ * F$g$ = 1,9 * 102 N
a= $\frac {F_h} {m}$=
$\frac {1,9 * 10^2 N} {52kg}$ = 3,7 m/s2
v2 = 2*x*a = (2*3,7 m/s2*25m)1/2 = 13,6 m/s2


b) FHr = Fh - Fr

  F$r$ = µ*Fn
Fn = cos $\frac alpha$ * Fg = cos(22) * 5,1*102 =
= 4,7*102 N
Fr= 0,06  4,7 * 102= 28N
Fhr= 1,9* 102N - 28N = 1,6 * 102
a= $\frac {F_hr} {m}$ = 3,1 m/s2
v2 = a*2*x = (3,1 m/s2 * 2* 25m)1/2 = 12m/s


c) Fl= Fh + Fr= 1,9*102 N + 28N = 2,2 *102

  Fl + Fa= F
Fa = a*m = 2,0 m/s2 * 52kg = 104 N
F = 104 N + 2,2 * 102 N = 323N


4.6

a)geg m= 2,0t v=50 km/h ges: Ekin= 0.5*m*v2

   = 0.5 * 2000kg * (13,8 m/s)2
= 192901J = 193kJ


b)H = 200m m=1,0 m3

 Epot= m*g*h = 1962000J =1,9MJ


c)m = 4000m3 = 4000000kg v=1m/s Ekin =0,5*m*v2= 2000000J = 2MJ