Ask Questions, Get Answers
Menu
X
JEEMAIN Crash Practice
15 Test Series
NEET Crash Practice
15 Test Series
CBSE XII
Math
JEEMAIN
Math
Physics
Chemistry
Practice Test Series
CBSE XI
Math
NEET
Physics
Chemistry
Biology - XII
Biology - XI
Olympiad class V
Math - 5 Test Series
Olympiad class VI
Math - 5 Test Series
studyplans
JEEMAIN Crash Practice
15 Test Series
NEET Crash Practice
15 Test Series
CBSE XII
Math
JEEMAIN
Math
Physics
Chemistry
Practice Test Series
CBSE XI
Math
NEET
Physics
Chemistry
Biology - XII
Biology - XI
Olympiad class V
Math - 5 Test Series
Olympiad class VI
Math - 5 Test Series
mobile
exams
ask
sample papers
tutors
pricing
login
X
ASK
Home
>>
CBSE XII
>>
Math
>>
Differential Equations
A population grows at the rate of 8% per year. How long does it take for the population to double?
cbse
class12
additionalproblem
kvquestionbank2012
ch9
q21
p34
sec-b
math
Share
asked
Feb 4, 2013
by
meena.p
retagged
Dec 19, 2013
Please
log in
or
register
to add a comment.
Please
log in
or
register
to answer this question.
Related questions
When the interest is compounded continuously, the amount of money invested increases at a rate proportional to its size. If Rs.1000 is invested at 10% compounded continuously, in how many years will the original investment double itself?
cbse
class12
additionalproblem
kvquestionbank2012
ch9
q20
p34
sec-c
math
asked
Feb 4, 2013
by
meena.p
0
answers
A wet porous substance in the open air losses its moisture at a rate proportional to the moisture content. If a sheet hung in the wind loses half of its moisture during the first hour, when will it have lost 95% moisture, weather conditions remaining the same.
cbse
class12
additionalproblem
kvquestionbank2012
ch9
q22
p34
sec-b
math
asked
Feb 4, 2013
by
meena.p
0
answers
Newtons law of cooling states that the rate of change of the temperature T of an object is proportional to the difference between T and the (constant) temperature t of the surrounding medium. We can write it as \[\frac{dT}{dt}=-K(T-t),K>0\; constant.\]A cup of coffee is served at $ 185^\circ F$ in a room where the temperature is $65^\circ F .$ Two minutes later the temperature of the coffee has dropped to $155^\circ F.$(log 3/4=0.144, log3 = 1.09872). Find the time required for coffee to have $105^\circ F$ temperature.
cbse
class12
additionalproblem
kvquestionbank2012
ch9
q25
p34
sec-c
math
asked
Feb 4, 2013
by
meena.p
0
answers
The surface area of a balloon being inflated, changes at a rate proportional to time t. If initially its radius is 1 unit and after 3 seconds it is 2 units, find the radius after time 't'.
cbse
class12
additionalproblem
kvquestionbank2012
ch9
q23
p34
sec-a
math
asked
Feb 4, 2013
by
meena.p
0
answers
Solve: \[\frac{xdx+ydy}{xdy-ydx}=\sqrt{\frac{a^2-x^2-y^2}{x^2+y^2}}\] (Hint : take $ x=r\cos \theta,y=r \sin \theta,$ so that $x^2+y^2=r^2)$
cbse
class12
additionalproblem
kvquestionbank2012
ch9
q19
p34
sec-c
math
asked
Feb 4, 2013
by
meena.p
0
answers
Corpus luteum is pregnancy has a long life. However, if fertilization does not take place, it remain
cbse
class12
ch3
exemplar
theoryquestion
biology
sec-b
human reproduction
asked
Jun 15
by
pady_1
1
answer
A curve passing through the point (1,1) has the property that the perpendicular distance of the origin from the normal at any point P of the curve is equal to the distance of p from the x-axis. Determine the equation of the curve.
cbse
class12
additionalproblem
kvquestionbank2012
ch9
q24
p34
sec-b
math
asked
Feb 4, 2013
by
meena.p
0
answers
Ask Question
Tag:
Math
Phy
Chem
Bio
Other
SUBMIT QUESTION
►
Please Wait
Take Test
JEEMAIN Crash Practice
15 Test Series
NEET Crash Practice
15 Test Series
JEEMAIN
350+ TESTS
NEET
320+ TESTS
CBSE XI MATH
50+ TESTS
CBSE XII MATH
80+ TESTS
...