Answer: E = 0.85
Therefore the efficiency is: E = 0.85 or 85%
Explanation:
The efficiency (e) of a Carnot engine is defined as the ratio of the work (W) done by the engine to the input heat QH
E = W/QH.
W=QH – QC,
Where Qc is the output heat.
That is,
E=1 - Qc/QH
E =1 - Tc/TH
where Tc for a temperature of the cold reservoir and TH for a temperature of the hot reservoir.
Note: The unit of temperature must be in Kelvin.
Tc = 300K
TH = 2000K
Substituting the values of E, we have;
E = 1 - 300K/2000K
E = 1 - 0.15
E = 0.85
Therefore the efficiency is: E = 0.85 or 85%
Answer:The time interval is always positive quantity because time always moves forward. Time can not be reversed.
Explanation:
Velocity is defined as rate of change of position nothing but the displacement. Displacement can be positive or negative.
In case of time interval, time is always a positive quantity. it is impossible to reverse the time. To obtain any displacement we need to measure the time taken. which has to be positive. It always moves forward.
2.5/1=x/.25, x=miles, 0.25 represents 1/4 of an hour since 15 minutes is 1/4 of an hour
The school is .625 miles from the house
Answer:
exothermic
Explanation:
energy is absorbed by the surroundings