An elevator accelerates upward at 2.0 m/s?,
as illustrated in the diagram below:
The passenger has a mass of 85 kg.
Calculate the force the floor exerts on the
passenger.

Force the floor exerts on the  passenger is 833 N.

Explanation:

                                       i.e. = - = -mg = 833 N

                                       hence   is 833 N

are you like autistic or something?

xd

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.