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semoga jawabanku benar
= 40 W x 8 jam
= 40 w x (8 x 3600s)
= 4x8x36x1000 J
= 4x8x36 KJ
= 1152 KJ
10. W = P x t
= 350 w x 20 menit
= 350 x (20 x 60s)
= 35x2x6x1000 J
= 35x2x6 KJ
= 420 KJ