A. 6 F.

B. 32 F.

C. 68 F.

D. 136 F

Bairaxx
2022-10-15
Answered

A temperature of 20 C is equivalent to approximately

A. 6 F.

B. 32 F.

C. 68 F.

D. 136 F

A. 6 F.

B. 32 F.

C. 68 F.

D. 136 F

You can still ask an expert for help

Bridget Acevedo

Answered 2022-10-16
Author has **19** answers

We know that

$T(F)=T(C)\times \frac{9}{5}+32\phantom{\rule{0ex}{0ex}}=20\times \frac{9}{5}+32\phantom{\rule{0ex}{0ex}}=4\times 9+32\phantom{\rule{0ex}{0ex}}=36+32\phantom{\rule{0ex}{0ex}}=68$

Answer: C) 68 F.

$T(F)=T(C)\times \frac{9}{5}+32\phantom{\rule{0ex}{0ex}}=20\times \frac{9}{5}+32\phantom{\rule{0ex}{0ex}}=4\times 9+32\phantom{\rule{0ex}{0ex}}=36+32\phantom{\rule{0ex}{0ex}}=68$

Answer: C) 68 F.

asked 2022-04-26

Why the E of the time component 4-momentum is the total energy and not another?

The time component of the 4-momentum is $E/c$, and I saw that it is the "total energy" and from here we can derive the formula ${E}^{2}=(pc{)}^{2}+{m}^{2}{c}^{4}$

$E$ is the total energy? Can't it be some multiple of it or just some other energy?

The time component of the 4-momentum is $E/c$, and I saw that it is the "total energy" and from here we can derive the formula ${E}^{2}=(pc{)}^{2}+{m}^{2}{c}^{4}$

$E$ is the total energy? Can't it be some multiple of it or just some other energy?

asked 2022-11-20

If 50 degrees Fahrenheit - what is the temperature in degrees Celsius and Kelvin (F = 1.8C +32)?

asked 2022-05-14

Entropy change in a calorimetry problem

A standard textbook problem has us calculate the change in entropy in a system that undergoes some sort of heat exchange. For example, object $A$ has specific heat ${c}_{a}$ and initial temperature ${T}_{A}$ and object $B$ has specific heat ${c}_{b}$ with initial temperature ${T}_{B}$. They are they put in contact with each other until they reach thermal equilibrium, and our goal is to find the total entropy change of the system.

The standard solution is to use

$S=\int \frac{dQ}{T}$

where $dQ=mcdT$. But the above integral is only satisfied for reversible processes, whereas this heat exchange is clearly irreversible.

The usual workaround for this is to pick some reversible path and calculate the entropy change on our "fake" path, since entropy is a state variable. For example, in the free expansion of an ideal gas, we pick calculate the entropy change along an isotherm that carries us along the expansion to find the true change in entropy.

My question is - what exactly is the reversible path we are using when we use $dQ=mcdT$?

A standard textbook problem has us calculate the change in entropy in a system that undergoes some sort of heat exchange. For example, object $A$ has specific heat ${c}_{a}$ and initial temperature ${T}_{A}$ and object $B$ has specific heat ${c}_{b}$ with initial temperature ${T}_{B}$. They are they put in contact with each other until they reach thermal equilibrium, and our goal is to find the total entropy change of the system.

The standard solution is to use

$S=\int \frac{dQ}{T}$

where $dQ=mcdT$. But the above integral is only satisfied for reversible processes, whereas this heat exchange is clearly irreversible.

The usual workaround for this is to pick some reversible path and calculate the entropy change on our "fake" path, since entropy is a state variable. For example, in the free expansion of an ideal gas, we pick calculate the entropy change along an isotherm that carries us along the expansion to find the true change in entropy.

My question is - what exactly is the reversible path we are using when we use $dQ=mcdT$?

asked 2022-11-07

The formula for converting a Celsius temperature to a Fahrenheit temperature is: $F=C\times 9/5+32$

If C = 100 degrees, what is the equivalent Fahrenheit temperature?

If C = 100 degrees, what is the equivalent Fahrenheit temperature?

asked 2022-05-07

How to derive the formula for heat produced due to electricity correctly from Joule's laws for heating?

From Joule's laws, we get this:

$H\propto {I}^{2}Rt$

$\phantom{\rule{thickmathspace}{0ex}}\u27f9\phantom{\rule{thickmathspace}{0ex}}H=K{I}^{2}Rt...(i)$

Now, we have to find/define the value of K. According to my book, when $1A$ of current passes through a conductor of $1\mathrm{\Omega}$ for $1s$, $1J$ heat is produced. If that's the case, then from $(i)$ we get this:

$1=K\times 1\times 1\times 1$

$\phantom{\rule{thickmathspace}{0ex}}\u27f9\phantom{\rule{thickmathspace}{0ex}}K=1$

Therefore, we get our nice little formula:

$H=K{I}^{2}Rt$

My question with the above derivation is, how did we find that when $1A$ of current passes through a conductor of $1\mathrm{\Omega}$ for $1s$, $1J$ heat is produced? Through experimentation? What was the name of the experiment and who conducted it?

From Joule's laws, we get this:

$H\propto {I}^{2}Rt$

$\phantom{\rule{thickmathspace}{0ex}}\u27f9\phantom{\rule{thickmathspace}{0ex}}H=K{I}^{2}Rt...(i)$

Now, we have to find/define the value of K. According to my book, when $1A$ of current passes through a conductor of $1\mathrm{\Omega}$ for $1s$, $1J$ heat is produced. If that's the case, then from $(i)$ we get this:

$1=K\times 1\times 1\times 1$

$\phantom{\rule{thickmathspace}{0ex}}\u27f9\phantom{\rule{thickmathspace}{0ex}}K=1$

Therefore, we get our nice little formula:

$H=K{I}^{2}Rt$

My question with the above derivation is, how did we find that when $1A$ of current passes through a conductor of $1\mathrm{\Omega}$ for $1s$, $1J$ heat is produced? Through experimentation? What was the name of the experiment and who conducted it?

asked 2022-05-15

What is MIP hypothesis?

While reading about muon analysis I read that finding calorimetry segments along with the tracks in the silicon tracker for muons helps us find a subset of tracks compatible with the MIP hypothesis. I was looking for what MIP means and all I could find is Minimum Ionizing Particle. Does MIP mean that and what is the MIP hypothesis?

While reading about muon analysis I read that finding calorimetry segments along with the tracks in the silicon tracker for muons helps us find a subset of tracks compatible with the MIP hypothesis. I was looking for what MIP means and all I could find is Minimum Ionizing Particle. Does MIP mean that and what is the MIP hypothesis?

asked 2022-05-30

a metal rod that is 30.0 cm long expands by 0.0750 cm when its temperature is raised from 0°c to 100°c. a rod of a different material and of the same length expands by 0.040 cm for same rise in temperature. a third rod also 30.0 cm long is made up of pieces of each of the above metals placed end to end and expands 0.0550 cm between 0°c and 100°c. find the length of each portion of the composite bars