no 1- 2 tolong d kerjain

No. 1
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Diket :
Massa benda, m = 15 kg
Berat benda, w = m.g = 15•10 = 150 N
Sudut antara T dan vertikal, 53°
Sudut antara T dan F, a = (90° + 53°) = 143°
Sudut antara F dan m, b = 90°
Sudut antara m dan T, c = 127°

Tanya :
F = __?
T = __?

Jawab :
Gunakan aturan sinus aja yak

F/sin c = w/sin a
F/sin 127° = 150/sin 143°
F/sin 53° = 150/sin 37°
F/(4/5) = 150/(3/5)
F/4 = 150/3
F/4 = 50
F = 200 N

Dan

T/sin b = w/sin a
T/sin 90° = 150/sin 143°
T/1 = 150/sin 37°
T = 150/(3/5)
T = 150 x 5/3
T = 250 N

No. 2
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Diket :
T1 = 30 N
Sudut Apit Antara T1 dan T2, a = 150°
Sudut Apit antara T2 dan m, b = 120°
Sudut Apit antara m dan T1, c = 90°

Tanya :
T2 = __?
m = __?

Jawab :
Gunakan aturan sinus ya.
# T2/sin c = T1/sin b
T2/sin 90° = 30/sin 120°
T2/1 = 30/sin 60°
T2 = 30/(1/2.√3)
T2 = 60/√3
T2 = 20.√3 N

#
W/sin a = T1/sin b
W/sin 150° = 30/sin 120°
W/sin 30° = 30/sin 60°
W/(1/2) = 30/(1/2.√3)
W/1 = 30/(√3)
W = 10.√3
m.g = 10.√3
m•10 = 10√3
m = √3 kg

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