—second law of newton

where did the “2a” come from in the first equation?

i know that frictional force is equal to “normal force x coeficient of friction” but the problem is with that number 2 on left side.

Explanation:

They substituted the value of M₁.

∑F = ma

M₁ a = T₁ - F

M₁ a = T₁ - Nμ

M₁ a = T₁ - M₁g μ

Given that M₁ = 2, g = 9.81, and μ = 0.25:

(2) a = T₁ - (2) (9.81) (0.25)

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.

hello, i am papaguy.

i have found an answer to your question but use it as information.

information: because weak acids/bases have low concentration of hydrogen ions, the addition of water has a large impact on the ph. 2. a difference in 1 unit is a 10x difference in concentration for example; a liquid with ph of 3 is 10x more acidic than a liquid with a ph of 4. therefore, a liquid with a ph of 3 is stronger.

best of luck!