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3 years ago

15

Why is a rotting apple a reaction in which energy is neither absorbed nor released?

1 answer:

o-na [289]3 years ago

7 0

Answer:

Hey

It would have to be C because no net energy is lost.

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Final naïve case: If the highest-pitch string on the piano is made of spring steel (density = 7800 kg/m3) with a diameter of 1/3

oksano4ka [1.4K]

Answer:

The linear density is $K = 3.863 *10^{-3 } \ kg/m$

Explanation:

From the question we are told that

The density of steel is $\rho = 7800 \ kg/m^3$

The diameter of the string is $d = 0.794 \ mm = 7.94 *10^{-4} \ m$

The radius of the string is evaluated as $r = \frac{D}{2} = \frac{7.94 *10^{-4}}{2} = 3.97*10^{-4} \ m$

The volume of the string is mathematically evaluated as

$V = \pi * r ^2 * L$

Now assuming that the length of the string is L = 2 m

So

$V = 3.142 * (3.97 *10^{-4})^2 * (2)$

$V = 9.9041 *10^{-7} \ m^3$

Then the mass of the string would be

$m = \rho * V$

substituting value

$m = 7800*9.904 14 *10^{-7}$

$m = 7.73*10^{-3} \ kg$

Looking at the question we see that the unit of the linear density is $\frac{kg}{m}$

Hence the linear density is evaluated as

$K = \frac{m}{L}$

substituting value

$K = \frac{7.73 *10^{-3}}{2}$

$K = 3.863 *10^{-3 } \ kg/m$

8 0

3 years ago

2. An electrical heater 200mm long and 15mm in diameter is inserted into a drilled hole normal to the surface of a large block o

Alenkinab [10]

Answer:

The final temperature is 50.8degrees celcius

Explanation:

Pls refer to attached handwritten document

4 0

4 years ago

Read 2 more answers

What is the speed of a walking person in m/s if the person travels 2000 m in 35 minutes?

iren [92.7K]

Distance = 2000m

Time = 35 minutes = 35×60 sec = 2100 sec

We know, Speed = Distance/Time

Therefore, Speed

= 2000m/2100s = 20/21 m/s

Answer: 20/21 m/s

Hope it helps! Please do comment

4 0

3 years ago

An ideal gas initially at 4.00atm and 350 K is permitted

Nuetrik [128]

Explanation:

It is given that initially pressure of ideal gas is 4.00 atm and its temperature is 350 K. Let us assume that the final pressure is $P_{2}$ and final temperature is $T_{2}$ .

(a) We know that for a monoatomic gas, value of $\gamma$ is \frac{5}{3}[/tex].

And, in case of adiabatic process,

$PV^{\gamma}$ = constant

also, PV = nRT

So, here $T_{1}$ = 350 K, $V_{1} = V$ , and $V_{2} = 1.5 V$

Hence, $\frac{T_{2}}{T_{1}} = (\frac{V_{1}}{V_{2}})^{\gamma -1}$

$\frac{T_{2}}{350 K} = (\frac{V}{1.5V})^{\frac{5}{3} -1}$

$T_{2}$ = 267 K

Also, $P_{1}$ = 4.0 atm, $V_{1} = V$ , and $V_{2} = 1.5 V$

$\frac{P_{2}}{P_{1}} = (\frac{V_{1}}{V_{2}})^{\gamma}$

$\frac{P_{2}}{4.0 atm} = (\frac{V}{1.5V})^{\frac{5}{3}}$

$P_{2}$ = 2.04 atm

Hence, for monoatomic gas final pressure is 2.04 atm and final temperature is 267 K.

(b) For diatomic gas, value of $\gamma$ is \frac{7}{5}[/tex].

As, $PV^{\gamma}$ = constant

also, PV = nRT

$T_{1}$ = 350 K, $V_{1} = V$ , and $V_{2} = 1.5 V$

$\frac{T_{2}}{T_{1}} = (\frac{V_{1}}{V_{2}})^{\gamma -1}$

$\frac{T_{2}}{350 K} = (\frac{V}{1.5V})^{\frac{7}{5} -1}$

$T_{2}$ = 289 K

And, $P_{1}$ = 4.0 atm, $V_{1} = V$ , and $V_{2} = 1.5 V$

$\frac{P_{2}}{P_{1}} = (\frac{V_{1}}{V_{2}})^{\gamma}$

$\frac{P_{2}}{4.0 atm} = (\frac{V}{1.5V})^{\frac{7}{5}}$

$P_{2}$ = 2.27 atm

Hence, for diatomic gas final pressure is 2.27 atm and final temperature is 289 K.

6 0

3 years ago

Detergents are used to clean the clothes why

Alex777 [14]

Answer:Detergent mixes with water to remove dirt and oil from clothes. Water can't remove oil and dirt from clothes. Detergent cleans by causing a chemical reaction with water to force dirt and debris out of clothing. Detergents work with water to loosen the dirt trapped in the material of clothing and clean them away.

Explanation:May i plz have brainlist only if u wanna give me brainlist though have an nice day!

8 0

3 years ago

Read 2 more answers