Aspring scale reads 20 n as it pulls a 4 kilogram box across a table. what is the magnitude of the force exerted by the mass on the spring scale, if the frictional force is assumed to be equal to zero?

20N

Explanation:

The same thing happens with your example: the spring scale exerts a force on the mass, and the mass exerts the same force back on the spring: 20Nt.

an energy transformation flow diagram is shown

where is it ?

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.