Dw) 6. One elevator lifts a mass a given height in 10 seconds. A second elevator does the same work in 5 seconds. Compared with the power developed by the first
elevator, the power developed by the second elevator is -
å
2
CLEAR

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.

d eras and periods

the answer is b, have negligible mass