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Likurg_2 [28]
4 years ago
7

if 0.45kg is changed by a reversible process to steam at 100°C, determine the entropy of: 1. the water 2. the surrounding. 3. th

e universe (water+surroundings) as a whole.​
Physics
1 answer:
Inessa [10]4 years ago
4 0

Answer:

1) 2726.5 J/K      2) decrease                     3) 0

Explanation:

1)

change in entropy is given by \Delta s\:=\frac{Q}{T}

here Q=mL where L is the latent heat of vaporization. therefore

Q=\frac{mL}{T}\Delta s\:=\frac{0.45X22.5X10^5}{100+273}=2726.5\:\:\frac{J}{K}

2) \Delta S=\frac{-Q}{T}\:

since the heat is taken from surroundings, the change in entropy is negative therefore entropy of surrounding will decrease.

3) since there is no heat exchange with universe  therefore , Q=0 in this case

\Delta S=\frac{Q}{T}\:=\frac{0}{T}=0

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Name a suitable plece of equipment that could be used to measure the length of the pool.​
Fynjy0 [20]

Answer:

With a tape measure.

Explanation:

We can use a big tape measure, this tape is in the market and we can use the one with the proper length that lets us measure different sections of the total length of the pool.

4 0
4 years ago
a sprinter with a mass of 80kg accelerates uniformly from 0 m/s to 9 m/s in 3 s. a.)what is the runners acceleration? b.) what i
Katyanochek1 [597]
Part A: 
Acceleration can be calculated by dividing the difference of the initial and final velocities by the given time. That is,
             a = (Vf - Vi) / t
where a is acceleration,
Vf is final velocity,
Vi is initial velocity, and
t is time

Substituting,
            a = (9 m/s - 0 m/s) / 3 s = 3 m/s²
<em>ANSWER: 3 m/s²</em>

Part B: 
From Newton's second law of motion, the net force is equal to the product of the mass and acceleration,
               F = m x a
where F is force,
m is mass, and 
a is acceleration

Substituting,
              F = (80 kg) x (3 m/s²) = 240 kg m/s² = 240 N

<em>ANSWER: 240 N </em>

Part C: 
The distance that the sprinter travel is calculated through the equation,
         d = V₀t + 0.5at²

Substituting,
            d = (0 m/s)(3 s) + 0.5(3 m/s²)(3 s)²
             d = 13.5 m

<em>ANSWER: d = 13.5 m</em>

3 0
3 years ago
1.15) What distance will 650 joules of work move a box weighing 50 newtons?​
son4ous [18]

Answer:

The answer is 13 however make sure if they ask for a certain measurement like meter answer it by saying 13 meters.

Explanation:

This basically turns into basic algebra if you know the formula for work. The formula for work is W=F*d  

Here are the variables that you know 650J=50N*d so you need d.

All you do is divide 650J by 50N and you get a total of 13 (meters since I don't know what they want you to put it in).

6 0
3 years ago
2. Which metal ion produces the light with the highest energy? <br> Na+<br> Ca+<br> K+<br> Ba2+
NeX [460]
"K+" is the one metal ion among the choices given in the question that produces <span>the light with the highest energy. The correct option among all the options that are given in the question is the third option or the penultimate option. I hope that the answer has actually come to your help.</span>
5 0
3 years ago
A large truck collides head-on with a small compact car. During the collision: (A) the truck exerts a greater amount of force on
Yakvenalex [24]

Answer:

A The truck exerts greater force

Explanation:

During collision the truck exerts greater force due to its much larger mass coupled with the speed than the car exerts on it thereby damaging the car more

7 0
3 years ago
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