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Surface gravity 1

Surface gravity - Bartol Research Instituteowocki/phys333/Lec06-25Feb.pdf · 980 cm/s2 9.8 m/s2. But this comes where the acceleration of gravity on Earth is ge from Newtons's law

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Page 1: Surface gravity - Bartol Research Instituteowocki/phys333/Lec06-25Feb.pdf · 980 cm/s2 9.8 m/s2. But this comes where the acceleration of gravity on Earth is ge from Newtons's law

Surface gravity

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Page 2: Surface gravity - Bartol Research Instituteowocki/phys333/Lec06-25Feb.pdf · 980 cm/s2 9.8 m/s2. But this comes where the acceleration of gravity on Earth is ge from Newtons's law

Orbital speed

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Page 3: Surface gravity - Bartol Research Instituteowocki/phys333/Lec06-25Feb.pdf · 980 cm/s2 9.8 m/s2. But this comes where the acceleration of gravity on Earth is ge from Newtons's law

Escape speed

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Page 4: Surface gravity - Bartol Research Instituteowocki/phys333/Lec06-25Feb.pdf · 980 cm/s2 9.8 m/s2. But this comes where the acceleration of gravity on Earth is ge from Newtons's law

Virial theorum for bound orbits

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Page 5: Surface gravity - Bartol Research Instituteowocki/phys333/Lec06-25Feb.pdf · 980 cm/s2 9.8 m/s2. But this comes where the acceleration of gravity on Earth is ge from Newtons's law
Page 6: Surface gravity - Bartol Research Instituteowocki/phys333/Lec06-25Feb.pdf · 980 cm/s2 9.8 m/s2. But this comes where the acceleration of gravity on Earth is ge from Newtons's law

Clicker question

A.  4.4B.  5.4C.  3.9D.  3.4E. Not enough information to answer.

In cgs units, the log of sun’s gravity is log gsun=4.4. What is log g for a star with with mass M=10 Msun and radius R=10 Rsun?

spowocki
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Page 7: Surface gravity - Bartol Research Instituteowocki/phys333/Lec06-25Feb.pdf · 980 cm/s2 9.8 m/s2. But this comes where the acceleration of gravity on Earth is ge from Newtons's law

Clicker question

A.  62 km/sB.  620 km/sC.  6200 km/sD.  200 km/sE. 2000 km/s

The sun has an escape speed Ve,s=620 km/s. What is the escape speed from a star with mass M=10 Msun and radius R=10 Rsun?

spowocki
Pencil
Page 8: Surface gravity - Bartol Research Instituteowocki/phys333/Lec06-25Feb.pdf · 980 cm/s2 9.8 m/s2. But this comes where the acceleration of gravity on Earth is ge from Newtons's law

Clicker question

A.  3 km/sB.  30 km/sC.  300 km/sD.  90 km/sE. 900 km/s

The earth at 1 au from the sun has an orbital speed Ve=30 km/s. What is the orbital speed of a planet orbiting a star of mass M=10 Msun at a distance of d=0.1 au?

spowocki
Pencil
Page 9: Surface gravity - Bartol Research Instituteowocki/phys333/Lec06-25Feb.pdf · 980 cm/s2 9.8 m/s2. But this comes where the acceleration of gravity on Earth is ge from Newtons's law

Inferring stellar motion

• Across the sky–  “Proper motion”

• Toward/away from us–  “Radial velocity”–  Doppler shift

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Page 10: Surface gravity - Bartol Research Instituteowocki/phys333/Lec06-25Feb.pdf · 980 cm/s2 9.8 m/s2. But this comes where the acceleration of gravity on Earth is ge from Newtons's law

Proper Motion & Tranverse Speed

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Page 11: Surface gravity - Bartol Research Instituteowocki/phys333/Lec06-25Feb.pdf · 980 cm/s2 9.8 m/s2. But this comes where the acceleration of gravity on Earth is ge from Newtons's law

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Page 12: Surface gravity - Bartol Research Instituteowocki/phys333/Lec06-25Feb.pdf · 980 cm/s2 9.8 m/s2. But this comes where the acceleration of gravity on Earth is ge from Newtons's law

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Page 13: Surface gravity - Bartol Research Instituteowocki/phys333/Lec06-25Feb.pdf · 980 cm/s2 9.8 m/s2. But this comes where the acceleration of gravity on Earth is ge from Newtons's law

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Page 14: Surface gravity - Bartol Research Instituteowocki/phys333/Lec06-25Feb.pdf · 980 cm/s2 9.8 m/s2. But this comes where the acceleration of gravity on Earth is ge from Newtons's law

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Page 15: Surface gravity - Bartol Research Instituteowocki/phys333/Lec06-25Feb.pdf · 980 cm/s2 9.8 m/s2. But this comes where the acceleration of gravity on Earth is ge from Newtons's law

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Page 16: Surface gravity - Bartol Research Instituteowocki/phys333/Lec06-25Feb.pdf · 980 cm/s2 9.8 m/s2. But this comes where the acceleration of gravity on Earth is ge from Newtons's law

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Doppler shift and Radial velocity

Page 17: Surface gravity - Bartol Research Instituteowocki/phys333/Lec06-25Feb.pdf · 980 cm/s2 9.8 m/s2. But this comes where the acceleration of gravity on Earth is ge from Newtons's law
Page 18: Surface gravity - Bartol Research Instituteowocki/phys333/Lec06-25Feb.pdf · 980 cm/s2 9.8 m/s2. But this comes where the acceleration of gravity on Earth is ge from Newtons's law

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Page 19: Surface gravity - Bartol Research Instituteowocki/phys333/Lec06-25Feb.pdf · 980 cm/s2 9.8 m/s2. But this comes where the acceleration of gravity on Earth is ge from Newtons's law

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observer

Page 20: Surface gravity - Bartol Research Instituteowocki/phys333/Lec06-25Feb.pdf · 980 cm/s2 9.8 m/s2. But this comes where the acceleration of gravity on Earth is ge from Newtons's law

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Page 21: Surface gravity - Bartol Research Instituteowocki/phys333/Lec06-25Feb.pdf · 980 cm/s2 9.8 m/s2. But this comes where the acceleration of gravity on Earth is ge from Newtons's law

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Page 22: Surface gravity - Bartol Research Instituteowocki/phys333/Lec06-25Feb.pdf · 980 cm/s2 9.8 m/s2. But this comes where the acceleration of gravity on Earth is ge from Newtons's law

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