Astronomy #4

which one of the following describes an object that is accelerating?

A car going around a circular track at a steady 100 miles per hour.

Suppose you visit another planet:

Your mass would be the same as on Earth, but your weight would be different.

Which person is weightless?

A child in the air as she plays on a trampoline.

Consider the statement "There's no gravity in space." This statement is:

completely false

If you want to make a rocket turn left, you need to:

Fire an engine that shoots out gas to the right.

Compared to its angular momentum when it is farthest from the Sun, Earth's angular momentum when it is nearest to the Sun is:

the same

the gravitational potential energy of a contracting interstellar cloud

gradually transforms into other forms of energy

If Earth were twice as far from the Sun, the force of gravity attracting Earth to the Sun would be

one quarter as strong

According to the law of universal gravitation, what would happen to Earth if the Sun were somehow replaced by a black hole of the same mass?

Earth's orbit would not change

If the Moon were closer to Earth, high tides would

Be higher than they are now

speed

the rate at which an object is moving

velocity

speed in a certain direction

acceleration

a change in velocity (a change in either speed or direction)

momentum

mass*velocity

force

can change an objects momentum causing it to accelerate

What are Newtons three laws of motion

1)an object moves at a constant velocity if there is no net force acting upon it 2)force=mass*acceleration 3)for any force there is always an equal and opposite reaction force

conservation of momentum

an objects momentum cannot change unless it transfers angular momentum to another object

3 types of energy

kinetic,radiative,potential

universal law of gravitation

every object attracts every other object with a gravitational force that is directly proportinal to the product of the objects masses and declines with the square of the distance between their centers F(g)=G((M1M2)/(d2))

how does newtons law of gravity extends keplers laws

1)he showed that any object going around another object will obey Keplers first two laws 2)he showed that bond orbits in ellipses which include circles are not the only possible orbital shape orbits can also be unbound parabolas or hyperbolas 3)he showed that two objects actually orbit their common center of mass 4)Newtons version of Keplers third law allows us to calculate the masses of orbiting objects from their orbital periods and distances

Astronomy #4 - Subjecto.com

Astronomy #4

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which one of the following describes an object that is accelerating?

A car going around a circular track at a steady 100 miles per hour.

Suppose you visit another planet:

Your mass would be the same as on Earth, but your weight would be different.

Which person is weightless?

A child in the air as she plays on a trampoline.

Consider the statement "There’s no gravity in space." This statement is:

completely false

If you want to make a rocket turn left, you need to:

Fire an engine that shoots out gas to the right.

Compared to its angular momentum when it is farthest from the Sun, Earth’s angular momentum when it is nearest to the Sun is:

the same

the gravitational potential energy of a contracting interstellar cloud

gradually transforms into other forms of energy

If Earth were twice as far from the Sun, the force of gravity attracting Earth to the Sun would be

one quarter as strong

According to the law of universal gravitation, what would happen to Earth if the Sun were somehow replaced by a black hole of the same mass?

Earth’s orbit would not change

If the Moon were closer to Earth, high tides would

Be higher than they are now

speed

the rate at which an object is moving

velocity

speed in a certain direction

acceleration

a change in velocity (a change in either speed or direction)

momentum

mass*velocity

force

can change an objects momentum causing it to accelerate

What are Newtons three laws of motion

1)an object moves at a constant velocity if there is no net force acting upon it 2)force=mass*acceleration 3)for any force there is always an equal and opposite reaction force

conservation of momentum

an objects momentum cannot change unless it transfers angular momentum to another object

3 types of energy

kinetic,radiative,potential

universal law of gravitation

every object attracts every other object with a gravitational force that is directly proportinal to the product of the objects masses and declines with the square of the distance between their centers F(g)=G((M1M2)/(d2))

how does newtons law of gravity extends keplers laws

1)he showed that any object going around another object will obey Keplers first two laws 2)he showed that bond orbits in ellipses which include circles are not the only possible orbital shape orbits can also be unbound parabolas or hyperbolas 3)he showed that two objects actually orbit their common center of mass 4)Newtons version of Keplers third law allows us to calculate the masses of orbiting objects from their orbital periods and distances

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