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What is the efficiency of lawn mower's engine when the heat input is 1000 joules and the waste heat is 750 joules?
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∙ 7y ago
25 percent
Norris Bernhard
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What is the ratio of the energy a machine delivers to the energy supplied to it?
efficiencyThe ratio of useful energy to total input energy is called efficiency. It refers to the percentage of the work input that is converted to work output.
Formula for calculating efficiency of a power supply?
Efficiency = workout / workin * 100% how do I format this in the worksheet if the workout=KG what the work in will be?
What is the formula for mechanical efficiency?
Mechanical efficiency:force x distance (output)/ force x distance (input) x 100%ex. 700n x 2 m / 800n x 2m x 100%1400nm/1600nm x 100%0.875 x 100%= 875Mechanical efficiency= 875%The preceding example is incorrectMechanical efficiency is: % efficiency=output power/input power x 100
Why DC motors are not operated to devolop maximum power in practice?
It is almost inevitable that some energy is lost.If the engine produces heat, as in a gasoline engine, there is a theoretical limit - that of the theoretical Carnot engine - which is itself less than 100%. For example, if the ambient temperature is 300 kelvin and the engine works at 900 kelvin, the theoretical efficiency is 66.666... percent. But the real efficiency would be even less than that.
Caltulation of turbine effiency which having multiple extraction?
You compare the btu input with the btu output. Divide the input into the output and that will give you the efficiency. With multiple extraction you will have to add all the uses. For example 100 million btuh input, with all sources of output having 82 million btuh- divide 100 into 82, for .82, or 82% efficiency.
What is efficiency of lawn mower's engine when the heat input is 1000 joules and the waste heat is 750 joules?
25 percent
What is the efficiency of a car's engine when the heat input is 100000 joules and the waste heat is 75000 joules?
25%
What is the efficiency of a street cleaner's engine when the heat input is 200000 joules and the heat waste is 150000 joules?
25 percent
What is the efficiency of a street cleaners engine when the heat input is 200 000 joules and the waste heat is 150 000 joules?
200,000-150,000= 50,000 25 %
Find the efficiency of a machine that does 800 joules of work if the input work is 2400 joules?
.33
What is the machine efficiency of a machine that produces 400 joules of work output from a work input of 500 joules?
The efficiency is 80%. To find the efficiency, 400/500 = 80%.
What is the mechanical efficiency of a machine that produces 400 joules of work output from work input of 500 joules?
The efficiency is 80%. To find the efficiency, 400/500 = 80%.
What is the efficiency of a machine that requires 100 joules of input energy to do 35 joules of useful work?
The machine efficiency is 35 percent (35/100).
What is the mechanical efficiency of a machine that produce 400 joules of work output from a work input of 500 joules?
The efficiency is 80%. To find the efficiency, 400/500 = 80%.
What is the efficiency of a pulley system when its work out equals 100 joules and its work in equals 150 joules?
If the input energy is 210 joules and the efficiency of the system is 30%,then the output energy is30% of 210 = (0.3 x 210) = 63 joules.
What is the efficiency of a street cleaners engine when the heat input is 200000 joules and the waste is 150000 joules?
If the waste heat is 15 compared to the total heat input of 20 (ignoring the thousands) this means the heat doing useful work is 5, which represents 25 percent of the total input heat, so this is the efficiency. Waste heat in a car is the sum of the engine cooling losses and the exhaust losses, the rest is converted to mechanical energy which is useful. 25%
What is the mechanical efficiency of a machine that produces 400 jouls of work output from a work input of 500 joules?
The efficiency is 80%. To find the efficiency, 400/500 = 80%.
