A50.0-kg box rests on a horizontal surface. the coefficient of static friction between the box and the surface is 0.300 and the coefficient of kinetic friction is 0.200. what is the friction force on the box if (a) a horizontal 140-n push is applied to it?

98N and 147N

Explanation:

We have the following information:

We can find the static fricton force as follow,

Where N is the normal force (mg)

Static friction force at 147N is greater than the force applied hence body does not move.

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.

that would be because of both gravity and friction. so     c