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berat=w=m.g=80 N g=10 N
m = 80/g =80/10=8 kg
v= plt = 20.10.20=4000 cm3
= 0,004 m3
massa jenis=m/v= 8/0,004 = 2000 kg/m3
b. berat jenis=w/v
= 80/0,004
= 20000 N/m3
a. massa jenis benda = massa ÷ volume = 80 ÷ 40 = 20 kg/m3
b. w = m.g/v = 80.9,8/40 = 19,6