An empirical observation is if one forms drops at a constant flow rate such that the drop time is 1, then the observed drop mass, m(t), varies with 1 according to the equation m(t) = m. + st 3/4 where m. is the "equilibrium" value and s is a 9.44s + 5.37. using these two relationships, it is possible to determine surface tension as a function of surface age by means of the drop weight method. combine these equations to obtain one relating m(t) and 1, where ) is the equilibrium drop mass (and the one to which eq. il-25 applies) and surface age 1. for a particular surfactant solution, the observed drop mass is 80.4 mg for drops formed very slowly and 125.7 mg for drops formed every 2 sec. the radius of the tip used is 5 mm and the density of the solution was 1.03 g/cm'. calculate the equilibrium surface tension and that for a surface age of 2 sec given (a) f = 0.6456; and (b) f = 0.6043. (note refs. 41 and 124.)

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.

speed of light in vacuum is 300,000 km/s

speed of light in other mediums is given by the expression v = c/n, where c is the speed of light in vacuum and n is the refractive index of medium.

for the first medium v = 200,000 km/s

  so, refractive index of medium = 300000/200000 = 1.5

    1.5 refractive index is usually for glass. so first medium is glass.

for the second medium v = 250,00 km/s

so, refractive index of medium = 300000/250000 = 1.2

    1.2 refractive index is usually for water. so second medium is water.

for the third medium v = 0 km/s

so, refractive index of medium = 300000/0 = ∞

    ∞ refractive index is usually for opaque mediums. so third medium is opaque medium.

there are no atoms