Which option correctly defines a generator?

1. a device that converts thermal energy into mechanical energy
2. a device that converts light energy into electrical energy
3. a device that converts electrical energy into mechanical energy
4. a device that converts mechanical energy into electrical energy

The answer is 2. A generator takes the gas and runs it through the carburetor and then that takes it to the electrical port to be converted into electricity.

i would think it's food chain

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.