Jawaban:

1.

Fx = F cos 37 = 150 x 0,8 = 120 N

s = 1 m

W = ?

W = Fx s = 120x 1 = 120 J

2.

W = 138000 J

t = 1 menit = 60 detik

P = ?

P = W/t = 138000/60 = 2300 watt

3.

3buah x 100watt x 3jam x 30 hari = 27000 wH = 27 kWH

4.

v₀ = 0

m = 50 kg

a = 2 m/s²

t = 10 menit = 10x60 detik = 600 s (di soal mungkin maksudnya 10 detik, kalo 10 detik ketemu Ek = 10 kJ)

Ek = ?

F = ma

F = 50 x 2 = 100 N

s = v₀ t + 1/2 at²

s = 0 + 1/2 x 2 x 600²

s = 360000 m

Ek = F s

Ek = 100 x 360000 = 36000 000 J ( tak ketemu )

5.

m = 10 kg

P = 2,5 J/s

t = 1 menit = 60 s

s = 1 m

F = ?

W = P t

W = 2,5 x 60 = 150 J

ΣF =  F - W sin 37 = F - 10x10x0,6 = F - 60

W = ΣF s

150 = (F - 60) x 1

F = 210 N

6.

a. PLTS (surya) dan PLTB (bayu udara)

7.

b. cuaca panas berlangsung cukup panjang dalam setahun

*maaf bila tak benar

*biasakan cari jawaban lain utk dibandingkan

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