Transcript Astronomy Day Two

Astronomy Day Two
Dimensions of Solar System, Newton's Laws,
Gravity and Escape Velocities
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http://microcosm.web.cern.ch/Microcosm/P10/english/welcome.html
Every body contintues in a state of rest, or in
a state of uniform motion in a straight line,
unless it is compelled to change that state
by a force acting upon it.
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Every body contintues in a state of rest, or in
a state of uniform motion in a straight line,
unless it is compelled to change that state
by a force acting upon it.
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Orbital Velocity of Earth is 29.8 km/sec
Radius of Earth Orbit (A.U.) is 1.496 x 108
km
Acceleration is Velocity2 ÷ Radius
What is the centripital acceleration of the
Earth, that keeps it in orbit around the Sun?
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Every body contintues in a state of rest, or in
a state of uniform motion in a straight line,
unless it is compelled to change that state
by a force acting upon it.
QuickTime™ and a
TIFF (Uncomp resse d) de com press or
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Orbital Velocity of Earth is 29.8 km/sec
Radius of Earth Orbit (A.U.) is 1.496 x 108
km
Acceleration is Velocity2 ÷ Radius
What is the centripital acceleration of the
Earth, that keeps it in orbit around the Sun?
(29.9 km/sec)2 ÷ 1.496 x 108 km = .000005932
km/sec2
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Or,
.005932 meters/sec2
When a force "F" acts upon a body of mass
"m", it produces in it an acceleration "a", that
is equal to the force divided by the mass.
Therefore, a=F/m, and F=ma
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When a force "F" acts upon a body of mass
"m", it produces in it an acceleration "a", that
is equal to the force divided by the mass.
Therefore, a=F/m, and F=ma
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Earth has a mass of about 5.97 x 1024 kg
Acceleration is about .006 m/s2
What is the centripital force of gravity pulling
the Earth towards the Sun?
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When a force "F" acts upon a body of mass
"m", it produces in it an acceleration "a", that
is equal to the force divided by the mass.
Therefore, a=F/m, and F=ma
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Earth has a mass of about 5.97 x 1024 kg
Acceleration is about .006 m/s2
What is the centripital force of gravity pulling
the Earth towards the Sun?
F = .006 m/s2 x
5,970,000,000,000,000,000,000,000 kg
= 3.582 x 1023 N
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= a whole bunch of force.
Every action has an equal and opposite
reaction.
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The centripital "pull" of the Sun's gravity is
opposed almost exactly by the "push" of the
Earth trying to continue to move in a straight
line.
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Every particle of matter in the Universe
attracts every other particle of matter in the
universe with a force that is directly
proportional to the product of the masses of
the particles, and inversely proportional to
the square of the distance between them.
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Every particle of matter in the Universe
attracts every other particle of matter in the
universe with a force that is directly
proportional to the product of the masses of
the particles, and inversely proportional to
the square of the distance between them.
This force is a property of space itself, and
probably not something that moves within
space, although a particle called a "graviton"
has been postulated, and made popular on
"Star Trek".
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"Can't Live Without You Kurt", and "Don't
Leave Me Donna" are convinced that the
universe is pulling them together. This is
much to the chargrine of the others in the
hallway who must watch the P.D.A., but
anyway.
What is the gravitational pull of the two,
when they are 1 meter apart? Kurt has a
mass of 80 kilograms, and Donna has a
mass of 60 kilograms. The gravitational
constant is 6.67 x 10-11(N m2/kg2).
F=(Gm1m2/r2).
We shall dance, and we shall sing, and then one day we shall trade
a ring!!!
QuickTime™ and a
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"Can't Live Without You Kurt", and "Don't
Leave Me Donna" are convinced that the
universe is pulling them together. This is
much to the chargrine of the others in the
hallway who must watch the P.D.A., but
anyway.
What is the gravitational pull of the two,
when they are 1 meter apart? Kurt has a
mass of 80 kilograms, and Donna has a
mass of 60 kilograms. The gravitational
constant is 6.67 x 10-11(N m2/kg2).
F=(Gm1m2/r2).
F = (6.67 x 10-11 • 60 •80)÷(1 • 1)
F = .000003216 Newtons. Far, far less than the
force of a snowflake hitting the ground.
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What goes up might not
come back.
Does is come down?