1. m=1 kg; t=4 s
Ek=mv^2/2
v=gt
Ek=m(gt)^2/2= 1*(10*4)^2/2=800 J; A.
2. Ek-->v^2
p-->v
ΔEk=16
Δp=√16=4; A.
3. h=6 m; Ep=180 J; s=2 m
Ek=Ep-Ep1=Ep-mg(h-s)
Ep=mgh; m=Ep/gh
Ek=Ep-Epg(h-s)/gh=Ep-Ep(h-s)/h
Ek=Ep(1-(h-s)/h)=Ep(1-1+s/h)=Eps/h
Ek= 180*2/6=60 J
dla sprawdzenia
m= 180/10*6=3 kg
Ep= mgh= 3*10*6=180 J
v^2= 2gs
Ek= mv^2/2=m2gs/2=mgs= 3*10*2=60 J
podpowiedzi błędne
4. m=0,5; h=4 m
v^2=2gh
Ek=2mgh/2=mgh= 0,5*10*4=20 J; C.
5. Moc to iloraz pracy i czasu
P=W/t=Fs/t=Fv; D.
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1. m=1 kg; t=4 s
Ek=mv^2/2
v=gt
Ek=m(gt)^2/2= 1*(10*4)^2/2=800 J; A.
2. Ek-->v^2
p-->v
ΔEk=16
Δp=√16=4; A.
3. h=6 m; Ep=180 J; s=2 m
Ek=Ep-Ep1=Ep-mg(h-s)
Ep=mgh; m=Ep/gh
Ek=Ep-Epg(h-s)/gh=Ep-Ep(h-s)/h
Ek=Ep(1-(h-s)/h)=Ep(1-1+s/h)=Eps/h
Ek= 180*2/6=60 J
dla sprawdzenia
m= 180/10*6=3 kg
Ep= mgh= 3*10*6=180 J
v^2= 2gs
Ek= mv^2/2=m2gs/2=mgs= 3*10*2=60 J
podpowiedzi błędne
4. m=0,5; h=4 m
Ek=mv^2/2
v^2=2gh
Ek=2mgh/2=mgh= 0,5*10*4=20 J; C.
5. Moc to iloraz pracy i czasu
P=W/t=Fs/t=Fv; D.