Which best describes thermal energy?

A. It is the difference between internal energies of two or more substances.

B. It is the sum of internal energies of two or more substances.

C. It is the portion of internal energy that can be transferred from one substance to another.

D. It is the portion of potential energy that can be transferred from one substance to another.

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.

radiation

explanation:

heat is transmitted by radiation