Jawaban:

1.

m = 2 kg

h = 2 m

g = 10 m/s²

a.

v = √2gh

v = √2x10x2 = 2√10 m/s

b.

v₀ = 0 (jatuh bebas)

v = v₀ t + gt

2√10 = 0 + 10t

t = 0,2√10 = 0,6 s

2.

h = 40 m

m = 100 kg

η = 75% = 0,75

g = 10 m/s²

Ep = ?

Ep = mgh

Ep = 100x10x40 = 40000 J

E yg berubah = η Ep = 0,75 x 40000 = 30000 J

3.

Q = 324 kJ = 324000 J

V = 300 volt

i = 1,5 A

t = 10 menit = 10x60 = 600 detik

η = ?

W = Vit

W = 300x1,5x600 = 270000 J

η = Q/W = 324000/270000 = 1,2 (?) salahnya dimana ya

4.

R = 240 ohm

i = 0,5 A

P = ?

P = Vi

P = iRi = 0,5x240x0,5 = 60 watt

*maaf bila tak benar

*biasakan cari jawaban lain utk dibandingkan

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