1鋁塊質(zhì)量為27kg全部浸入水中后遭到的浮力為多少牛？若他的1半浸在煤油中

【專家解說】：V鋁 = m鋁/ρ鋁 = 2.7kg/(2.7 x 103kg/m3）=1x10∧⑶m3 全部浸入時 V排 = V鋁F浮 = ρ水gV鋁 = 1x 103kg/m3 x 10N/kg x 1 x 10∧⑶m3 = 10N1半浸在煤油中時 V′ 排= V鋁/2 = (1x10∧⑶m3)/2 = 5 x 10∧⑷m3F′ 浮 = ρ油gV′ 排 = 0.8 x 103kg/m3 x 10N/kg x 5 x 10∧⑷m3 = 4N