Astro 7N Exam 1
The pressure of gravity by the Sun continues the planet in orbit round it, however how do the
planets have an effect on the solar?
They exert an equally robust pull on the solar, causing it move slightly
Newton's First Law
An item at relaxation remains at rest and an object in movement stays in motion with the same
speed and in the same path unless acted upon with the aid of an unbalanced force.
Ex: if the solar all of sudden disappeared, the Earth could keep in the direction that it was
traveling in its orbit at that point
Newton's Second Law
The acceleration of a body because of a pressure could be within the equal direction as the
pressure, with significance immediately proportional to its mass
Force = mass x acceleration
A smaller mas will pass quicker, if the equal pressure is carried out to it
Newton's Third Law
For each motion there is an equal and contrary reaction
The Sun exerts pressure on planets, and that they orbit it - he planets exert equal pressure on
Sun, however it handiest moves slightly due to its very massive mass relative to the planets
Surface Gravity on a Planet
the power of gravity: g = m/r^2
wherein M is the mass of the planet and R is its radius. Note the radius is squared but the mass
isn't.
More mass = more gravity.
,- If the mass of a planet have been two times that of any other, however they'd the same radius,
the gravity felt at the surface of the more-massive one would be twice as robust.
Larger separation = less gravity.
- If the radius of a planet had been twice that of any other, the gravity is 1 / (2) 2 = 1/four as
sturdy.
Putting the effects of mass and radius together, you must be capable of figure out the floor
gravity of Mars, relative to the Earth.
- Mars has 1/10 the mass of the Earth and half the radius of Earth. So for Mars,
g = (1/10) / (1/2) 2 = (1/10) / (1/4) = 4/10
Mars has a surface gravity four/10 that of Earth. You will need that allows you to do this sort of
estimate for the test, given the numbers for mass and radius.
If I practice exactly the identical quantity of pressure to a pebble and a boulder, what is going to
show up
the pebble will pass quicker
If the Earth have been moved to half of its modern distance from the solar, how could the
pressure of gravity by the sun on the planet alternate?
It would turn out to be four instances weaker
Mass
As the mass of the planet increases, the leap top does decreases via the identical factor
As the mass of the planet decreases, the soar top does increases by the same issue
According to Newton's Second regulation of motion, if the net pressure performing at the item
will increase whilst the mass of the item remains consistent, what takes place to acceleration
acceleration will increase
If the earth were actions to half its present day distance from the Sun, how might the pressure of
gravity by means of the Sun at the Earth exchange
, it would turn out to be 4 instances weaker
What did newton's law of commonplace gravitation tell us approximately how gravity works
the force of gravity from the solar might be more potent on object with extra mass
If you were to take a seat at the ground, there would be a pressure due to gravity pulling you
towards the earth. Which of the subsequent is genuine in line with newton's third law
you're pushing the earth faraway from yourself with the identical pressure
what could occur to the earth sun's gravity come what may turned off instantaneously
it'd continue to move within the line within the identical route it changed into transferring while
the gravity turned off
Newton's Universal Law of Gravitation
This law offers the force of gravity between any objects within the Universe. The force of gravity
is proportional to (mass of item 1) × (mass of item 2) divided through the gap between the 2
gadgets squared:
F M1 x M2 / d 2
Again, greater mass = more potent gravity. If the items were moved 2 instances closer (or, to 1/2
of their initial distance among), ...
F M1 x M2 / (1/2) 2 = M1 x M2 / (1/four) = 4 (M1 x M2)
... So, the gravitational enchantment would grow to be 4 times as brilliant.
The Seasons, Day & Night
Q: What reasons day and night time?
A: Rotation of the Earth on its axis.
Q: How does the Sun appear to transport inside the sky in the path of an afternoon?
A: East to West, because of Earth's rotation. The stars and planets circulate in the identical
manner from our point of view, also, because of Earth's rotation.
Q: What takes place to the Earth in twelve months?
The pressure of gravity by the Sun continues the planet in orbit round it, however how do the
planets have an effect on the solar?
They exert an equally robust pull on the solar, causing it move slightly
Newton's First Law
An item at relaxation remains at rest and an object in movement stays in motion with the same
speed and in the same path unless acted upon with the aid of an unbalanced force.
Ex: if the solar all of sudden disappeared, the Earth could keep in the direction that it was
traveling in its orbit at that point
Newton's Second Law
The acceleration of a body because of a pressure could be within the equal direction as the
pressure, with significance immediately proportional to its mass
Force = mass x acceleration
A smaller mas will pass quicker, if the equal pressure is carried out to it
Newton's Third Law
For each motion there is an equal and contrary reaction
The Sun exerts pressure on planets, and that they orbit it - he planets exert equal pressure on
Sun, however it handiest moves slightly due to its very massive mass relative to the planets
Surface Gravity on a Planet
the power of gravity: g = m/r^2
wherein M is the mass of the planet and R is its radius. Note the radius is squared but the mass
isn't.
More mass = more gravity.
,- If the mass of a planet have been two times that of any other, however they'd the same radius,
the gravity felt at the surface of the more-massive one would be twice as robust.
Larger separation = less gravity.
- If the radius of a planet had been twice that of any other, the gravity is 1 / (2) 2 = 1/four as
sturdy.
Putting the effects of mass and radius together, you must be capable of figure out the floor
gravity of Mars, relative to the Earth.
- Mars has 1/10 the mass of the Earth and half the radius of Earth. So for Mars,
g = (1/10) / (1/2) 2 = (1/10) / (1/4) = 4/10
Mars has a surface gravity four/10 that of Earth. You will need that allows you to do this sort of
estimate for the test, given the numbers for mass and radius.
If I practice exactly the identical quantity of pressure to a pebble and a boulder, what is going to
show up
the pebble will pass quicker
If the Earth have been moved to half of its modern distance from the solar, how could the
pressure of gravity by the sun on the planet alternate?
It would turn out to be four instances weaker
Mass
As the mass of the planet increases, the leap top does decreases via the identical factor
As the mass of the planet decreases, the soar top does increases by the same issue
According to Newton's Second regulation of motion, if the net pressure performing at the item
will increase whilst the mass of the item remains consistent, what takes place to acceleration
acceleration will increase
If the earth were actions to half its present day distance from the Sun, how might the pressure of
gravity by means of the Sun at the Earth exchange
, it would turn out to be 4 instances weaker
What did newton's law of commonplace gravitation tell us approximately how gravity works
the force of gravity from the solar might be more potent on object with extra mass
If you were to take a seat at the ground, there would be a pressure due to gravity pulling you
towards the earth. Which of the subsequent is genuine in line with newton's third law
you're pushing the earth faraway from yourself with the identical pressure
what could occur to the earth sun's gravity come what may turned off instantaneously
it'd continue to move within the line within the identical route it changed into transferring while
the gravity turned off
Newton's Universal Law of Gravitation
This law offers the force of gravity between any objects within the Universe. The force of gravity
is proportional to (mass of item 1) × (mass of item 2) divided through the gap between the 2
gadgets squared:
F M1 x M2 / d 2
Again, greater mass = more potent gravity. If the items were moved 2 instances closer (or, to 1/2
of their initial distance among), ...
F M1 x M2 / (1/2) 2 = M1 x M2 / (1/four) = 4 (M1 x M2)
... So, the gravitational enchantment would grow to be 4 times as brilliant.
The Seasons, Day & Night
Q: What reasons day and night time?
A: Rotation of the Earth on its axis.
Q: How does the Sun appear to transport inside the sky in the path of an afternoon?
A: East to West, because of Earth's rotation. The stars and planets circulate in the identical
manner from our point of view, also, because of Earth's rotation.
Q: What takes place to the Earth in twelve months?
