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Recent questions tagged p155
Questions
A radioactive substance disintegrates at a rate proportional to its mass. When its mass is $10 $mgm, the rate of disintegration is $0.051$ mgm per day. How long will it take for the mass to be reduced from $10$mgm to $5$mgm.$ [\log_{e}$$2=0.6931]$
tnstate
class12
bookproblem
ch8
sec-1
exercise8-6
p155
q5
asked
Apr 17, 2013
by
poojasapani_1
1
answer
The rate at which the population of a city increases at any time is propotional to the population at that time. If there were $1,30,000$ people in the city in $1960 $ and $1,60,000$ in $1990$ what population may be anticipated in $2020$.$[\log_{e}(\large\frac{16}{13})=$$.2070;$$e^{.42}=1.52]$
math
tnstate
class12
bookproblem
ch8
sec-1
exercise8-6
p155
q4
medium
jeemain
differential-equations
asked
Apr 17, 2013
by
poojasapani_1
1
answer
A cup of coffee at temperature $100^{\circ}$$C$ is placed in a room whose temperature is $15^ {\circ}$$C$ and it cools to $60^{\circ}$$C$ in $5$ minutes . Find its temperature after a further interval of $5$ minutes.
tnstate
class12
math
bookproblem
ch8
sec-1
exercise8-6
p155
q3
jeemain
difficult
modelpaper
oct-2009
asked
Apr 17, 2013
by
poojasapani_1
1
answer
The sum of Rs $1000$ is compounded continuously, the nominal rate of interest being four percent per annum. In how many years will the amount be twice the original principal ? $(\log_{e}$$2=0.6931)$
tnstate
class12
bookproblem
ch8
sec-1
exercise8-6
p155
q2
modelpaper
oct-2006
jun-2007
jun-2008
asked
Apr 17, 2013
by
poojasapani_1
1
answer
Radium disappears at a rate propotional to the amount present .If $5\%$ of the original amount disappears in $50$ years , how much will remain at the end of $100$ years [Take $A_{0}$ as a intial amount.]
tnstate
class12
bookproblem
ch8
sec-1
exercise8-6
p155
q1
modelpaper
jun-2009
mar-2010
asked
Apr 17, 2013
by
poojasapani_1
1
answer
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