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mina [271]
3 years ago
14

What is the unit of time most often used by scientists?

Mathematics
2 answers:
Natasha2012 [34]3 years ago
7 0
Seconds is usually the unit used
laiz [17]3 years ago
4 0
The answer is seconds
You might be interested in
Newton's law of cooling is:
Mnenie [13.5K]

Answer:

t = \frac{ln(\frac{21}{59})}{-0.15}=6.887 hr

So it would takes approximately 6.9 hours to reach 32 F.

Step-by-step explanation:

For this case we have the following differential equationÑ

\frac{du}{dt}= -k (u-T)

We can reorder the expression like this:

\frac{du}{u-T} = -k dt

We can use the substitution w = u-T and dw =du so then we have:

\frac{dw}{w} =-k dt

IF we integrate both sides we got:

ln |w| = -kt +C

If we apply exponential in both sides we got:

w = e^{-kt} *e^c

And if we replace w = u-T we got:

u(t)= T + C_1 e^{-kt}

We can also express the solution in the following terms:

u(t) = (T_i -T_{amb}) e^{kt} +T_{amb}

For this case we know that k =-0.15 hr since w ehave a cooloing, T_{i}= 70 F, T_{amb}=11F, we have this model:

u(t) = (70-11) e^{-0.15t} +11

And if we want that the temperature would be 32F we can solve for t like this:

32 = 59 e^{-0.15 t} +11

21=59 e^{-0.15 t}

\frac{21}{59} = e^{-0.15 t}

If we apply natural logs on both sides we got:

ln (\frac{21}{59}) =-0.15 t

t = \frac{ln(\frac{21}{59})}{-0.15}=6.887 hr

So it would takes approximately 6.9 hours to reach 32 F.

7 0
3 years ago
Please help me I'm super super stuck on my Math homework
leonid [27]
The answer is A or it should be

5 0
3 years ago
Read 2 more answers
PLEASE HELP SO I MADE A STAIN ON MY PARENTS COUCH SO I USED STAIN REMOVER BUT THE STAIN REMOVER LEFT A STAIN AND IM NOT SURE HOW
lana66690 [7]

Answer:

that's hardly visible i wouldn't worry about it

Step-by-step explanation:

1+1=2

8 0
3 years ago
PLEASE SOLVE NOW!! I’m in desperate need
Brut [27]

Answer:

sqr of 161

Step-by-step explanation:

8^2 + x^2 = 225

64+x^2 = 225

161=x^2

sqr of 161 = x

hope i helped!!!

8 0
3 years ago
Read 2 more answers
Helppppppppppppppppppppppppppp
Dmitry_Shevchenko [17]

Answer:

126 m^{2}

Step-by-step explanation:

4 0
3 years ago
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