Answer:
![0.3\ \text{m}^3/\text{kg}](https://tex.z-dn.net/?f=0.3%5C%20%5Ctext%7Bm%7D%5E3%2F%5Ctext%7Bkg%7D)
![36\ \text{kJ}](https://tex.z-dn.net/?f=36%5C%20%5Ctext%7BkJ%7D)
![18\ \text{kJ/kg}](https://tex.z-dn.net/?f=18%5C%20%5Ctext%7BkJ%2Fkg%7D)
Explanation:
V = Volume of air = ![0.6\ \text{m}^3](https://tex.z-dn.net/?f=0.6%5C%20%5Ctext%7Bm%7D%5E3)
P = Power = 10 W
t = Time = 1 hour
m = Mass of air = 2 kg
Specific volume is given by
![v=\dfrac{V}{m}\\\Rightarrow v=\dfrac{0.6}{2}\\\Rightarrow v=0.3\ \text{m}^3/\text{kg}](https://tex.z-dn.net/?f=v%3D%5Cdfrac%7BV%7D%7Bm%7D%5C%5C%5CRightarrow%20v%3D%5Cdfrac%7B0.6%7D%7B2%7D%5C%5C%5CRightarrow%20v%3D0.3%5C%20%5Ctext%7Bm%7D%5E3%2F%5Ctext%7Bkg%7D)
The specific volume at the final state is ![0.3\ \text{m}^3/\text{kg}](https://tex.z-dn.net/?f=0.3%5C%20%5Ctext%7Bm%7D%5E3%2F%5Ctext%7Bkg%7D)
Work done is given by
![W=Pt\\\Rightarrow W=10\times 60\times 60\\\Rightarrow W=36000\ \text{J}=36\ \text{kJ}](https://tex.z-dn.net/?f=W%3DPt%5C%5C%5CRightarrow%20W%3D10%5Ctimes%2060%5Ctimes%2060%5C%5C%5CRightarrow%20W%3D36000%5C%20%5Ctext%7BJ%7D%3D36%5C%20%5Ctext%7BkJ%7D)
The energy transfer by work, is ![36\ \text{kJ}](https://tex.z-dn.net/?f=36%5C%20%5Ctext%7BkJ%7D)
Change in specific internal energy is given by
![\Delta u=\dfrac{Q}{m}+\dfrac{W}{m}\\\Rightarrow \Delta u=0+\dfrac{36}{2}\\\Rightarrow \Delta u=18\ \text{kJ/kg}](https://tex.z-dn.net/?f=%5CDelta%20u%3D%5Cdfrac%7BQ%7D%7Bm%7D%2B%5Cdfrac%7BW%7D%7Bm%7D%5C%5C%5CRightarrow%20%5CDelta%20u%3D0%2B%5Cdfrac%7B36%7D%7B2%7D%5C%5C%5CRightarrow%20%5CDelta%20u%3D18%5C%20%5Ctext%7BkJ%2Fkg%7D)
The change in specific internal energy of the air is ![18\ \text{kJ/kg}](https://tex.z-dn.net/?f=18%5C%20%5Ctext%7BkJ%2Fkg%7D)
V= d/t, The answer is 0.83 km/m.
Answer:
Explanation:
We shall represent each displacement in vector form .
i will represent east , j will represent north .
D₁ = 4.1 west = - 4.1 i
D₂ = 17.3 north = 17.3 j
D₃ = - 1.2 cos65.4 i + 1.2 sin65.4 j
= - .5 i + 1.09 j
Total displacement
= D₁ + D₂ + D₃
= - 4.1 i + 17.3 j - .5 i + 1.09 j
D = - 4.6 i + 18.39 j
magnitude of D
= √ ( 4.6² + 18.39² )
= √ (21.16 + 338.2 )
= √359.36
= 18.95 km .
Final displacement = 18.95 km .
Answer:
Astronomers have no theoretical explanation for the ""hot Jupiters"" observed orbiting some other stars.
False
Explanation:
The “hot Jupiters” joint word startes to be used to be able to describe planets like 51 Pegasi b, a planet with a 10-day-or-less orbit and a mass 25% or greater than Jupitere, circling a sun-like star planet in 1995, which was found by astronomers Michel Mayor and Didier Queloz, who were awarded the 2019 Nobel Prize for Physics along with the cosmologist James Peebles for their “contributions to our understanding of the evolution of the universe and Earth’s place in the cosmos.”
Now we know a total of 4,000-plus exoplanets, but only a few more than 400 meet the definition of the enigmatic hot Jupiters which, tell us a lot about how planetary systems form, and what kinds of conditions cause extreme results.
In a 2018 paper in the Annual Review of Astronomy and Astrophysics, astronomers Rebekah Dawson of the Pennsylvania State University and John Asher Johnson of Harvard University reviewed on how hot Jupiters might have formed, and would be the meaning for the rest of the planets in the galaxy.