A wire 50cm long and having a diameter of 0.05cm is in a room at 20ºC. The specific resistance of the material of wire is 2µΩ per cm cube while its temperature co-efficient is 0.004 at 20ºC. Calculate the resistance of wire at 20ºC, if the temperature of the room rises to 25ºC. Find the new resistance of wire.

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.

+15-35=-20

going in opposite directions