Silnik o mocy 400W wciąga ciało o masie 20 kg na wysokość 2 m w czasie 2 sek. Oblicz wykonaną pracę..
P=400W
m=20kg
h=2m
t=2s
g=10m/s2
W=mgh
P=W/t
P=(20kg*2m*10m/s2)/2s=200W
200W/400W*100%=50%
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P=400W
m=20kg
h=2m
t=2s
g=10m/s2
W=mgh
P=W/t
P=(20kg*2m*10m/s2)/2s=200W
200W/400W*100%=50%