Aspherical water drop 1.4 um in diameter is suspended in calm air due to a downward- directed atmospheric electic leld of magni-587 nc. (a) what i the magnitude of the gravitational force on the drop? (b) how many excess electrons does it have?

electrons en excess

Explanation:

We use the density of water equal to 1000 Kg/m^3, in order to find the mass and Force gravitational:

As the water drop is suspended in calm air, the Gravitational force is compensated with the electrical Force:

But:

We solve in order to find the number of electrons in excess at the water drop:

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.

more than, less

less than, more