ΣFx = 0
μ.Na - Nb = 0
μ.Na = Nb
Na : Gaya normal lantai.
Nb : Gaya normal dinding.
ΣFy = 0
Na = Wt + Wo
Na = 100 + 500 = 600 N
Nb = μ. Na = 0,5. 600
Nb = 300 N
Wt : Berat tangga.
Wo : Berat orang.
Στ = 0 terhadap ujung bawah tangga.
Nb. 4 - Wt. 1,5 - Wo. x = 0
300. 4 - 100. 1,5 - 500. x = 0
1200 - 150 - 500. x = 0
500.x = 1050
x = 1050/500
x = 2,1 m
Tinggi orang
tan 53 = t/x
t = x. tan 53
t = 2,1. 4/3
t = 2,8 m
Jawaban. B
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ΣFx = 0
μ.Na - Nb = 0
μ.Na = Nb
Na : Gaya normal lantai.
Nb : Gaya normal dinding.
ΣFy = 0
Na = Wt + Wo
Na = 100 + 500 = 600 N
Nb = μ. Na = 0,5. 600
Nb = 300 N
Wt : Berat tangga.
Wo : Berat orang.
Στ = 0 terhadap ujung bawah tangga.
Nb. 4 - Wt. 1,5 - Wo. x = 0
300. 4 - 100. 1,5 - 500. x = 0
1200 - 150 - 500. x = 0
500.x = 1050
x = 1050/500
x = 2,1 m
Tinggi orang
tan 53 = t/x
t = x. tan 53
t = 2,1. 4/3
t = 2,8 m
Jawaban. B