Question

URRGENT!!!! Va rog AJUTATIMA!!!Am nevoie pana marti!!! Orice problema ma ajuta! Va rog macar o problema!

Answer 1

1. L=Fxd=5000 N=5kN

2. L=Fxd=5X10⁶x8x10³=40 x10⁹ N

3.L=Fxd, d=L/F=1200/400=3 m

4. L=Fxd, F=L/d=9x10³/30=300 N

5. conf princ II F-Ff=ma, dar v=ct, a=0 , F=Ff
Lmotor=Fxd=160x3=480

lucrul mecanic rezistent este lucrul mecanic efectuat de forta de frecare si care se opune miscarii deci este negativ
Lr=-Ffxd=-160x3=-480N
6.d=L/F=2x10⁶/100x10³=20 m
7. v=d/t, d=vt
Lom=Fd=Fvt=200x0,5x5=500 J
F-Ffma, v=ct, a=0, F=Ff, Lff=-500J
8. L=Fvt, v=L/Ft=30x10⁶/4x10³x300=25 m/s
9.

Answer 2

9).   10% din 5000 N = 500N
L = 500N×60m = 30kJ
10).  G = mg = 500kg×10 = 5000N
 F = 20×5000N : 100 = 1000N
150 kJ = Fd;  d = 150kJ / 1000N = 150m
11).  V = 1m × 1m × 0,8m = 0,8m³
m = ρV = 0,8m³ × 800kg/m³ = 640 kg
G = mg = 640kg × 10N/kg = 6400 N
Ff = 0,2 × 6400N = 1280N
L = Ff × d;  d = L : Ff = 6400J : 1280N = 5m