Figure 5 shows an electric urm used to boil water 5
3 600 W
The urn contains water at a temperature of 21°C. It is switched on for 50 minutes
(a
Calculate the energy supplied to the kettle by the electricity supply​

wavelength divides in half and speed stays the same.

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

answerdmitry mendeleyev made a workable classification of the elements