zad4 Cialo poruszajace sie z predkoscia 10m/s zwiekszylo predkosc do 100m/s w czasie 30 sek jakie jest przyspieszenie tego ruchu zad5 cialo porusza sie sie po okregu o promieniu 40cm oblicz a czestotliwosc jezeli cialo wykonuje 420 obrotow w 3min b okres obiegu c predkosc tego ruchu
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z.4
v1 = 10 m/s
v2 = 100 m/s
t = 30 s
zatem
a = [ v2 - v1 ]/t = [ 100 - 10] m/s : 30 s = 90 m/s : 30 s = 3 m/s^2
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z.5
r = 40 cm = 0,4 m
t = 3 min = 180 s
zatem
a)
f = 420 / 180 s = 2 1/3 1/s = 7/3 1/s = 7/3 Hz
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b)
T = 1/f = 3/7 s
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c)
v = 2 pi*r *f = 2 pi* 0,4 m * ( 7/3) 1/s = ( 56/30) *pi m/s = (28/15)*pi m/s
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zad. 4
v₀=10 m/s
vk = 100m/s
t = 30 s
zad. 5
a)
n = 420
t = 3 min = 180 s
b)