The current theory of the structure of the
earth, called plate tectonics, tells us that the
continents are in constant motion.
assume that the north american continent
can be represented by a slab of rock 5850 km
on a side and 35 km deep and that the rock
has an average mass density of 2750 kg/m3
.
the continent is moving at the rate of about
3.2 cm/year.
what is the mass of the continent?
answer in units of kg.
005 (part 2 of 3) 10.0 points
what is the kinetic energy of the continent?
answer in units of j.
006 (part 3 of 3) 10.0 points
a jogger (of mass 78 kg) has the same kinetic
energy as that of the continent.
what would his speed be?
answer in units of m/s.

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.

find the surface area of the sphere to the nearest square unit. use a calculator.

a. 254 in.2

b. 64 in.2

c. 127 in.2

d. 1,018 in.2

b

explanation: