Aclosed, rigid tank contains 5 kg of air initially at 300 k, 1 bar. as illustrated in fig. p6.50, the tank is in contact with a thermal reservoir at 600 k and heat transfer occurs at the boundary where the temperature is 600 k. a stirring rod transfers 600 kj of energy to the air. the final temperature is 600 k. the air can be modeled as an ideal gas with cv= 0.733 kj/kg·k and kinetic and potential energy effects are negligible. determine the amount of entropy transferred into the air and the amount of entropy produced, each in kj/

question1

1,000 tons

question2

3: 8

question 3

store d

step-by-step explanation:

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.

so easy. just google the electromagnetic waves and it’ll pop up.

305.7

explanation:

density =m/v

density =917/3.00

density = 305.

approximately = 305.7

in four significant figures