The Kelvin temperature of the hot reservoir of a Carnot engine is twice that of the cold reservoir, and work done by the engine per cycle is 18 J. (a) Calculate the efficiency of the engine.

η = 0.5 = 50%

Explanation:

The efficiency of a Carnot engine is given by the following formula:

η = (T₁ - T₂)/T₁

η = 1 - T₂/T₁

where,

η = Efficiency of the engine

T₁ = Absolute Temperature of Hot Reservoir

T₂ = Absolute Temperature of Cold Reservoir

but, according to given question the absolute temperature of hot reservoir is twice that of the cold reservoir. Therefore,

T₁ = 2 T₂

Substituting this in equation, we get:

η = 1 - T₂/2T₂

η = 1 - 1/2

η = 0.5 = 50%

this is an example of "committed" time.

committed time, as contracted time, takes need over essential and available time since it is seen as profitable work. it alludes to the time allotted to keep up a home and family. at the point when a man is commuting using committed time this individual may feel that the drive is an obligation to family, for example, strolling youngsters to class or driving a mate to work. contracted and committed time clients may feel that their commute could really compare to the commute of important or leisure time clients on the grounds that their commute is profitable work. in this manner, they might be more disposed to pick a mechanized method of movement.  

multiple allele inheritance is traits controlled by more than 2 alleles (ex: pigeons having 3 alleles of one gene govern their feather color).