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18.
dane:
F = 6 N
v = 0,6 m/s
t = 3 s
szukane:
m = ?
F = m * a /:a
m = F/a
ale
a = v/t = 0,6m/s/3s = 0,2 m/s2 = 0,2 N/kg
m = 6N/0,2N/kg
m = 30 kg
19.
dane:
m = 1 t = 1000 kg
t = 20 s
s = 400 m
szukane:
Fw = ?
Fw = m * a
s = at^2/2 I*2
at^2 = 2s /:t^2
a = 2s/t^2 = 2 * 400m/(20s)^2 = 2 m/s2 = 2 N/kg
Fw = 1000kg * 2N/kg
Fw = 2000 N = 2 kN
II.
dane:
m = 1kg
v = 0,6 m/s
t = 2s
szukane:
F = ?
F = m * a
a = v/t = 0,6m/s/2s = 0,3 m/s2 = 0,3 N/kg
F = 1kg * 0,3N/kg
F = 0,3 N
19.
dane:
m = 200 t = 200 000 kg
t = 30 s
s = 900 m
szukane:
Fw = ?
Fw = m * a
s = at^2/2 I*2
at^2 = 2s /:t^2
a = 2s/t^2 = 2 * 900m/(30s)^2 = 2 N/kg
Fw = 200000kg * 2N/kg
Fw = 400 000 N = 0,4 MN
1 MN = 1 000 000 N