Ahmed is a heating consultant. One of his clients has a boiler that is 62% efficient and uses heating oil that releases 4.15 x 107 J kg-1 of heat energy when it bums in air. What mass of heating oil does the boiler need to heat 245 kg of water from 12.0 °C to 68.0 °C?

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

the answer to this is proletariats.

hope this : )

1.195000

explanation:

total mass=0.0117+0.0137+0.0881+0.0111

total mass= 0.01172kg

total velocity = 0.283-0.743+0.871-0.799+0.155+0.637+0.301=0.102

momentum=mv=0.1172*0.102=1.195000//