Question

proszę o rozwiązanie tych zadanek:

1 W=5500J

F=1,1kN s=?

2 s=200cm

W=50J F=?

3 P=50W

W=1,5 kJ t=?

4 P=4W

W=480J t=?

5 h=125cm

g=10m/s2 v=?

6 v=4m/s

g=10m/s2 h=?

z dokładnymi obliczeniami daję najj

Answer 1

zadanie 1

 

W = 5500J

F = 1,1kN = 1100N

 

W = Fs => s = W/F

 

s = 5500J/1100N = 5m

 

zadanie 2

 

s = 2m

W = 50J

 

F = W/s

 

F = 50J/2m = 25N

 

zadanie 3

 

P = 50W

W = 1,5kJ = 1500J

 

P = W/t => t = W/P

 

t = 1500J/50W = 300s

 

zadanie 4

 

P = 4W

W = 480J

 

t = 480J/4W = 120s

 

zadanie 5

 

v = √2gh

h = 1,25m

g = 10m/s²

 

v = √2 x 1,25m x 10m/s² = 5m/s

 

zadani 6

 

h = v²/2g

v = 4m/s

g = 10m/s²

 

h = (4m/s)²/2 x 10m/s² = 0,8m

 

 

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