Question

Nomor 25-28 mohon bantuan.

Answer 1

Nomor 25
F = (F1 + F2) - (F3 + F4)
F = (20 N + 40 N) - (35 N + 25 N)
F = 60 N - 60 N
F = 0 -----------[ tidak ada perpindahan]
--> 0 joule [A]

Nomor 26
P = W/t
P = F x s / t
P = 600 N x 4 m /  8 menit         ( ubah 8 menit = 480 detik )
P = 2.400 Nm x 480 s               ( tanda bagi jadi kali, dan pecahan dibalik)
P = 5 watt  [C]

nomor 27
P = W/t
P = F x s / t
P = 80 N x 3 m / 20 s
P = 12 watt   [C]

nomor 28
W = F x s
F = W / s
F = 60 kJ / 4 m
F = 60.000 J / 4 m
F = 15.000 N   
F = 1,5  x  10⁴  [A]