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4 years ago

Kimberly Burns 360 cal in 45 minutes while jogging determine how many calories can really burns per minute

Mathematics

1 answer:

IgorLugansk [536]4 years ago

8 0

Answer:

Step-by-step explanation:

360 divided by 45 is 8 calories per minute

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4 years ago

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3 years ago

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Step-by-step explanation:

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3 years ago

How long will it take for a radioactive isotope with a decay constant of 0.15 (which means a half life of 4.6 days ) to decay to

hichkok12 [17]

For half lives
$A=P(\frac{1}{2})^\frac{t}{h}$

A=final amount
P=present amount
t=time in some units (this case it is days)
h=half life in days in th is case

so
given
we want 5% left
so A=5% of P or 5/100 of P or 1/20 of P or 0.05P

h=4.6

so
$0.05P=P(\frac{1}{2})^\frac{t}{4.6}$
divide bth sides by P
$0.05=(\frac{1}{2})^\frac{t}{4.6}$
take ln of both sides
$ln(0.05)=ln(\frac{1}{2})^\frac{t}{4.6}$
$ln(0.05)=(\frac{t}{4.6})ln(\frac{1}{2})$
$ln(0.05)=(\frac{t}{4.6})ln(\frac{1}{2})$
divide both sides by $ln(\frac{1}{2})$
$\frac{ln(0.05)}{ln(\frac{1}{2})}=\frac{t}{4.6}$
times both sides by 4.6
$\frac{4.6ln(0.05)}{ln(\frac{1}{2})}=t$
use your calculator
19.889t
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Answer:

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Step-by-step explanation:

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3 years ago