Areal heat engine operates between temperatures tc and th. during a certain time, an amount qc of heat is released to the cold reservoir. during that time, what is the maximum amount of work wmax that the engine might have performed? express your answer in terms of qc, th, and tc.

Explanation:

given,

Temperature of heat engine operate between

Th (temperature in hot reservoir) and Tc(temperature in cold reservoir)

amount of heat released to = Qc

to find maximum amount of work = ?

now,

efficiency of heat engine

now,

 maximum work =

above expression gives the expression of maximum amount of work.

answer: at 24 february, 2014 the population gets twice of its initial population.

explanation:

since we have given that

the population for alpha city, t years after january 1, 2004 is given as

first we find out the initial population, i.e. t=0,

so, our quadratic equation becomes,

according to question, we have said that if the population has twice its initial population, then it becomes

so, time taken to reach this above mentioned population is given by

now, we know that time can't be negative so, we take t=9.149 years.

hence, at 24 february, 2014 the population gets twice of its initial population.

lol

explanation: