(1) (100-m杯)/60 =(60-m杯)/20
解得 m杯=40
答:量杯的质量m杯为40g .
(2) ρ液=m液/v液=(60g-40g)/20c㎡= 1g/cm²
答:液体密度ρ液为1g/cm² .
(3)添加条件:m杯+m液=80g时,求v液
V液=(m总-m杯)/ρ液=(80g-40g)/ 1g/cm² =40cm²
(1) (100-m杯)/60 =(60-m杯)/20
解得 m杯=40
答:量杯的质量m杯为40g .
(2) ρ液=m液/v液=(60g-40g)/20c㎡= 1g/cm²
答:液体密度ρ液为1g/cm² .
(3)添加条件:m杯+m液=80g时,求v液
V液=(m总-m杯)/ρ液=(80g-40g)/ 1g/cm² =40cm²