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 * 10-3s Subscript 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) FH r = 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   Fh r = 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