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AS Physics question help please!
1) A power station has an efficiency of 35% and it produces 200MW of electrical power. The fuel used in the power station releases 80MJ per kilogram of fuel burned. calculate:
- the energy per second supplied by the fuel
- the mass of fuel burned per day
2) A vehicle engine has a power output of 6.2kW and uses fuel which releases 45MJ per kilogram when burned. At a speed of 30m/s on a level road, the fuel usage of the vehicle is 18km per kg. Calculate:
- the time taken by the vehicle to travel 18km at 30m/s
- the useful energy supplied by the engine in this time
- the overall efficiency of the engine
Many thanks
- the energy per second supplied by the fuel
- the mass of fuel burned per day
2) A vehicle engine has a power output of 6.2kW and uses fuel which releases 45MJ per kilogram when burned. At a speed of 30m/s on a level road, the fuel usage of the vehicle is 18km per kg. Calculate:
- the time taken by the vehicle to travel 18km at 30m/s
- the useful energy supplied by the engine in this time
- the overall efficiency of the engine
Many thanks
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