几道英文版的物理题,1.A4.0kgtoyboatthatis0.7timesthedensityofwaterfloatsinwater.whatmassofwaterisdisplaced?2.whena3kgstoneissuspendedinwater,itsapparentmassis1.5kg.whatisthedensityofthestonecomparedtothe

Question

几道英文版的物理题,
1.A 4.0kg toy boat that is 0.7 times the density of water floats in water.what mass of water is displaced?
2.when a 3kg stone is suspended in water,its apparent mass is 1.5kg.what is the density of the stone compared to the density of water?
3.what percentage of earth's radius equals the approximate height of earth's atmosphere?(earth's atmosphere extends some 30km high and earth's radius is 6400km)

Answer 1

1.一个4公斤的玩具船浮在水上,密度是水的0.7倍,排出的水的质量是多少?----4公斤
2.一个3公斤的石块悬在水中时,它的显示质量是1.5公斤.石块的密度是水的密度的多少倍?----1.5倍
3.地球半径的百分之多少等于地球大气的近似高度?（地球的大气延伸到约30公里的高空,地球的半径是6400公里）----0.47