Afloating object oscillates up and down 2 complete cycles in 1 second as a water wave of wavelength 5 meters passes by. the speed of the wave is

10 m/s

Explanation:

The speed of a wave is given by

where

is the wavelength

f is the frequency

For the wave in this problem,

- The frequency is given by the number of oscillations per second, so

- The wavelength is

So, the wave speed is

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.

the answer is a. hope this .