Cho cơ hệ như hình vẽ . Thả cho trụ rỗng theo phương thẳng đứng xuống dưới. Biết khối lượng của trụ m =5kg, bán kính R=20cm dây nhẹ, không giãn, g=10 Hỏi phân tích các lực tác dụng vào trụ rỗng . B) xác định gia tốc tịnh tiến, gia tốc góc của trụ rỗng theo m R g

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.

i think the answer would be reserve.