Question

Zad 1 i 2 bez 3

Answer 1

Zad,1

dane:

m = 300 kg

h = 12 m

g = 10 m/s2

szukane:

W = ?

 

W = E 

W = m x g x h = 300kg x 10m/s2 x 12m = 36 000 J

W = 36 kJ

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Zad.2

dane:

P = 250 W

m = 150 kg

h = 10 m

g = 10 m/s2

szukane:

t = ?

 

P = W/t  I*t

Pt = W  /:P

t = W/P 

    W m x g x h

t = mgh/P = 150kg x 10m/s2 x 10m/250W 

t = 60 s = 1 min

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