A) a 5.75 ml sample of mercury has a measured mass of 77.05 g. the density is

Density of the sample will be 13.4 kg/L

Explanation:

We have given volume of the sample

Mass of the sample

We have to find the density of the sample

Density of the sample is given by

So density of the sample will be 13.4 kg/L

when jerome paddle in flowing river towards east the net speed of jerome will increase

so the net speed of jerome will be given as

now the speed of paul will be same as it is given as he is running on the ground

so

so here we can say since the speed of jerome is more so he will win the race

now as we know the distance so the time difference is given as

so jerome will reach first and the time difference will be 203.55 s or 3.4 min