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-Dominant- [34]
3 years ago
15

Who reported four “element” classifications, but included some substances that were combinations of elements rather than true el

ements in his listing?
Physics
1 answer:
notsponge [240]3 years ago
7 0
Antoine-Laurent Lavoisier was the first person to report the four element classification system but also ended up including some compounds rather than elements.
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A van moves with a constant speed of 20 miles per hour. How far can it travel in 3 1/2 hours
koban [17]
I think the answer would be 70
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The purpose of _______'s ministry was to bring the nation in exile back to the God of their covenant
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The answer would be Jeremiah
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Read 2 more answers
Carbon dioxide (CO2) gas in a piston-cylinder assembly undergoes three processes in series that begin and end at the same state
topjm [15]

Answer:

a) W =400 kJ

b) W = 0 kJ

c) W =-160.944 KJ

Explanation:

<u>Given  </u>

<u><em>Process 1 ---> 2 </em></u>

The relation of the process P = constant

Pressure of point (1) P1 =  10 bar = P2

Volume of point (1) V1   = 1 m^3

Volume of point (2) V2 =4 m^3

The relation of the process V = constant  

<u>Process 2 ---> 3 </u>

The relation of the process V = constant

V3 = V2

Pressure of point (3) P3 = 10 bar

Volume of point (3) V3 = 4 m^3

<u>Process 3 ---> 1 </u>

The relation of the process PV = constant  

<u>Required  </u>

Sketch the processes on the PV coordinates

The work for each process in kJ  

<u>Solution  </u>

The work is defined by  

W=\int\limits^a_b {x} \, dx

<em>a=V2</em>

<em>b=V1</em>

<em>x=P</em>

<em>dx=dV</em>

<u>Process 1 ---> 2  </u>

P3 = P4 = 5 bar  

W=\int\limits^a_b {x} \, dx

<em>a=V3</em>

<em>b=V2</em>

<em>x=4</em>

<em>dx=dV</em>

putting the value of a, b, x, dx in above integral

W=400 kJ

<u>Process 2 ---> 3 </u>

V = constant Then there is no change in the volume,hence W = 0 kJ  

<u>Process 3 ---> 1  </u>

By substituting with point (1) --> 5 x .2 = C ---> C = 1 P = 5V^-1  

 W=\int\limits^a_b {x} \, dx

a=V1

b=V3

x=1V^-1

dx=dV

putting the value of a, b, x, dx in above integral

W=| ln V | limit a and b

  = -160.944 KJ

5 0
3 years ago
an alligator crawls 25m to the left with an average velocity of -1.2m/s. how many seconds did the alligator crawl?
Crank
It will take 21s for yhe alligator to crawl that distance. Reported answer contains 2 Significant Figures.

5 0
3 years ago
A hot rod can accelerate from 0 to 60 km/h in 5.4 s.
mylen [45]

Answer:

<h2>a) Acceleration is 3.09 m/s²</h2><h2>b) Distance traveled is 45.05 m</h2><h2>c) Time taken to travel 250 m is 12.72 s</h2>

Explanation:

a) We have equation of motion v = u + at

      Initial velocity, u = 0 km/hr = 0 m/s

      Final velocity, v = 60 km/hr = 16.67 m/s  

      Time, t = 5.4 s

      Substituting

                       v = u + at  

                       16.67 = 0 + a x 5.4

                       a = 3.09 m/s²

      Acceleration is 3.09 m/s²

b) We have equation of motion s = ut + 0.5 at²

         Initial velocity, u = 0 m/s

         Acceleration, a = 3.09 m/s²

         Time, t = 5.4 s      

      Substituting

                       s = ut + 0.5 at²

                       s = 0 x 5.4 + 0.5 x 3.09 x 5.4²

                       s = 45.05 m

       Distance traveled is 45.05 m

c) We have equation of motion s = ut + 0.5 at²

         Initial velocity, u = 0 m/s

         Acceleration, a = 3.09 m/s²

         Displacement, s = 0.25 km = 250 m      

      Substituting

                       s = ut + 0.5 at²

                       250 = 0 x t + 0.5 x 3.09 xt²

                       t = 12.72 s

       Time taken to travel 250 m is 12.72 s

6 0
3 years ago
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