The power grid is the system that transfers electricity to homes and businesses. a power plant produces electricity. the output electricity is an input for the wires that lead to power sub stations. the power substations regulate the flow of electricity and send it as an output through different wires. transformers adjust the electricity along the way until it becomes an input for a home. what is the primary type of input and output that is used in the power grid system

First of all, input electricity is just indicating the direction of that energy, in this case, it refers to the  electrity that is being received in a sub-system. On the other hand, output electricity is the energy that is being produced to another sub-system.

For example, in this case the power plant represents the production of energy, which offer output electricity because produces the energy for other sub-system. Then, those sub-systems receive this energy, that's why at this level it becomes input energy.

Being said that, we can say that energy is the primary type of input and output, it's what is being used in the power grid.

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.

false.

explanation:

this statement is false. after falling for 5 seconds, its speed will not be 100 m/s.