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Clase 01_5°-Dinamica lineal.pptx
1. a
WB
WA=ma*g=3*10
F = m*a
Wa - Wb = (ma+mb)*a
30 - 20 = (3+2)*a
10=5*a
a=2 m/s2
T
En el bloque B:
F=mb*a
a
T - Wb=mb*a
T – 20 = 2*2
T = 20 + 4
T = 24 N
Wa - T=ma*a
30 – T = 3*2
30-6 = T
T = 24 N
En el bloque A:
2. a
a
Wa
N
T
Wb
T
F = m*a
Wb = (ma + mb)*a
(3)*(10)=(2+3)*a
30 = 5*a
a = 6 m/s2
En el bloque B:
F = mb*a
Wb – T = (3Kg) * (6m/s2)
30 – T = 18 N
30 – 18 = T
T = 12 N
12 N
3. a
Wc
Wa
Wb
T2
T1
F = m * a
W – Wc = (mc+ma+mb)*a
60 – 40 = (4+3+3)*a
20 = 10*a
a = 2 m/s2
W = Wa + Wb
W = 60 N
Wc
T2
F = mc * a
T2 – Wc = 4 * a
T2 – 40 = 4 * 2
T2 = 40 + 8
T2 = 48 N
a
Wb
T2
T1
F = mb * a
Wb + T1 – T2 = 3 * a
30 + T1 – 48 = 3 * 2
T1 – 18 = 6
T1 = 24 N
a
4. F = m * a
100 – 40 = (2 +3 +5)*a
60 = 10*a
a = 6 m/s2
a
Reacción
Rb
a
F = mc * a
100 – Rb = 5 * 6
100 – 30 = Rb
Rb = 70 N
5. W = m*g
550 N
a F = m*a
550 – W = 25 * a
550 – 250 = 25*a
300 = 25*a
a = 12 m/s2