6. Konstanta pegas
F = k.x
k = F/x = m.g/x
k = 2.10/0,04
k = 2000/4 = 500 N/m
Energi potensial
Ep = 1/2.k.x²
Ep = 1/2. 500. 0,04²
Ep = 250. 16/10000
Ep = 4000/10000
Ep = 0,4 J
7.
MODULUS YOUNG E
F/A = E.ΔL/L
E = F.L/A.ΔL
E = 100. 0,4/( 2.10⁻⁶ . 1.10⁻³)
E = 2.10¹⁰ Pa
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6. Konstanta pegas
F = k.x
k = F/x = m.g/x
k = 2.10/0,04
k = 2000/4 = 500 N/m
Energi potensial
Ep = 1/2.k.x²
Ep = 1/2. 500. 0,04²
Ep = 250. 16/10000
Ep = 4000/10000
Ep = 0,4 J
7.
MODULUS YOUNG E
F/A = E.ΔL/L
E = F.L/A.ΔL
E = 100. 0,4/( 2.10⁻⁶ . 1.10⁻³)
E = 2.10¹⁰ Pa
dx = 4 cm = 0,04 m
EP = 1/2. k. dx^2
pertama cari k nya dulu.
w = k. dx
2. 10 = k. 0,04
20 = k. 0,04
k = 500 n/m
EP = 1/2. 500. (0,04)^2
EP = 250. 0,0016
EP = 0,4 Joule
soal no 7
diketahui : L = 40 cm = 0,4 m
A = 2 mm² = 2 x 10⁻⁶ m²
F = 100 N
ΔL = 1 mm = 10⁻³ m
ditanya : Y = .... ?
dijawab :
Y = (F . L) / (A . ΔL)
= (100 . 0,4) / (2 x 10⁻⁶ x 10⁻³)
= 40 / (2 x 10⁻⁹)
= 20 x 10⁹
Y = 2x 10¹⁰ N/m²