Odpowiedzi

2010-01-13T15:49:46+01:00
Ep=m*g*h
Ep=1kg*10m/s*5m
Ep=50J
a)55kJ=55000J
b)2MJ=2000000J
c)0,06=60J
d)24MJ=24000000J
e)845kJ=845000J
4 1 4
2010-01-13T15:52:37+01:00
55 kJ = 55 000 J
2 MJ = 2 000 000 J
0,06 kj = 60 J
24 MJ = 24 000 000 J
845 KJ = 845 000 j


Dane:
m = 20 dag = 200g
F = m*g= 200 * 10 = 2000 N
s = 5m
Szukane :
W = ?

W= F/s = 2 000 / 5 = 400w
4 1 4
2010-01-13T16:06:57+01:00
M = 20dag= 0,2 kg
g = 10 m/s^2
h = 5 m
Ep = m*g*h
Ep = 0,2 kg*10 m/s^2 *5m
Ep = 10 J
jednostki:
Ep = [kg*m/s^2 * m] = N*m] =[J]
zada.2
55 kJ = 55000 J bo przedrostek kilo = 1000
2 MJ = = 2000000 J
0,006 kJ = 0,006 *1000 = 6 J
24 mJ = 24 *1/1000= 0,024 J , bo mili = 1/1000
845 kJ = 845000 J
4 5 4