Question

Proszę o rozwiązanie zadań z załącznika

Answer 1

Zadanie 1

W₁ = F₁*h₁ = 9*3 = 27J

W₂ = F₂*h₂ = 2*15 = 30J

ΔW = 30 - 27 = 3J

W₂/W₁ = 30/27 = 1,11

 

 

 

Zadanie 2

F = W/h = 200/1 = 200N

m = F/g = 200/10 = 20kg

 

 

 

Zadanie 3

P = F*h/t = 9000*20/60 = 3000W = 3kW

 

 

 

Zadanie 5

W = Pt = 500*60 = 30000J = 30kJ

 

Zadanie 6

 

P = mgh/t = 1000*100/10 = 10000W = 10kW

 

Zadanie 7

E = Pt = 1000*10 = 10000W = 10kJ

 

Zadanie 8

V₁ = 36km/h = 10m/s

W₁ = Ek₁ = ½mV₁² = ½*0,6*100 = 30J

V₂ = 20m/s

W₂ = Ek₂ =  ½mV₂² = 120J

 

Zadanie 10

V₁ = 15m/s 

Ek₁ = ½*1500000*225 = 168750000J = 168,75MJ

V₂ = ½*10*360000 = 1800000J = 1,8MJ

ΔEk = 168,75 - 1,8 = 166,86MJ

Ek₁/Ek₂ = 93,75

 

 

Zadanie 11

h = V₀²/(2g) = 100/(2*10) = 100/20 = 5m

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Answer 2

1.
W1=F*s=9N*3m=27J W2=2*15=30J W1<W2
2.
Ep=W Ep=m*g*h m=Ep/g*h= 200J/10*1m= 200/10=20kg g=mg=200N

3.
P=W/t= F*s/t=9000N*20m*60s=3000W

4?
.P=3000N*20/1=60000W

5.
P=W/t W=P*t=500W*3600s=1800kJ

6. P=10000N*100m/10s=10000W=10kW

7.
W=P*t=1000W*600s=600000W=600kW

8.
Ek=W Ep=mv2/2=0.6kg*(10m/s)2/2=0.6*100/2=30J
Ep=0.6kg*(20m/s)2/2=0.6*400/2=120J

9.
Ek=1000kg*(10m/s)2/2- 1000*100/2=50kJ W-50kJ

10.
Ek1=1500000kg*(15)2/2=168750kJ
Ek2=10*(600)2/2=1800kJ

11.
Ek=Ep mv2/2=m*g*h v2/2=g*h [*2 v2=2gh h=v2/2g=10m/s2/20=5m

12.Ep=50*10*10=5000J Ek=50*(10)2/2=50*100/2=2500J Ep-Ek=2500J-siła oporu

13.
Ep=0.02kg*10*3m=0.6J 0.6/3=O.2 Ek=mv2/2 v=pierwiastek z Ek*2/m = pier 0.2*2/0.02=pier. 20J