Question

No 4 ,6 dan 7 pliss jawab

Answer 1

4. 
a. 0,00000000002345 = 2,345 x 10⁻¹¹
b. 12.245.657,0000 = 1,2245657 x 10⁷
c. 0,002356 = 2,356 x 10⁻³

6.
Fy = 2N
Fy = F sin 30
2 = F . 1/2
F = 4 N

Fx = F cos 30
Fx = 4 . 1/2√3
Fx = 2√3 N

7.
F1 = 4 N
F2 = 8 N
F3 = 12 N

F1x = F1 cos 30 = 4 . 1/2√3 = 2√3 N
F1y = F1 sin 30 = 4 . 1/2 = 2 N

F2x = F2 cos 60 = 8 . 1/2 = 4 N
F2y = F2 sin 60 = 8 . 1/2√3 = 4√3 N

F3x = F3 cos 90 = 12 . 0 = 0 N
F3y = F3 sin 90 = 12 . 1 = 12 N

∑Fx = 2√3 + 4 N ≈ 7,5 N
∑Fy = 2 + 4√3 + 12 = 14 + 4√3 N ≈ 20,9 N

F² = Fx² + Fy²
F² = 7,5² + 20,9²
F² = 56,25 + 436,81 = 493,06
F ≈ 22,2 N

tan β = Fy/Fxtan β = 20,9/7,5
tan β = 2,79
β = arc tan 2,79 
β = 70,28