Emily learns that ancient astronomers, such as Ptolemy, created a model of the solar
system based only on what they could see with their eyes. Describe Ptolemy's model
of the solar system and how he came to his conclusions. Then describe Galileo's
model of the solar system. Explain how Galileo proved that his model was correct and
that Ptolemy's was not correct.
sorry i had to label this as physics, there's no astronomy label! 20 points for a good answer. :)
Answer:
Explanation:
In Ptolemy's geocentric model of the universe, the Sun, the Moon, and each planet orbit a stationary Earth. He had them in circle orbits.
Galileo's model showed that the sun was the centre of the universe. That everything orbited around the earth. He also saw that they we in elliptical orbits.
Galileo proved Ptolemy wrong because Ptolemy said that everything orbited the earth and they orbited in circle but they orbit in ovals (elliptical) and that they orbit the sun.
Ptolemy was an astronomer, who developed the solar system based on the Earth as its center around which all the planets and Sun revolve. Galileo abolished this model by proving the Sun as the center of the solar system.
The Ptolemy model can be explained as:
Ptolemy model involved the Earth as its center. He believed that the moon was orbiting around the Earth, which is then followed by mercury, venus, and then Sun.
The Galileo model is explained as:
The Galileo model of the solar system involved the sun at the center of the solar system. He used his telescope to prove that all planets revolve around the Sun, in a solar system.
Galileo proved the Ptolemy model wrong by proving that Venus went through full sets of phases similar to the moon.
Thus, the galileo gave the heliocentric model, which is followed till today.
To know more about the solar system, refer to the following link:
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Activity that is equivalent to brisk walking in intensity is considered to be _______________ physical activity. *
vigorous
light
moderate
Answer:
moderate
Explanation:
because light would be walking casually while vigorous would be sprinting or something like that
A cylindrical glass that is 10cm high is partially filled with water. You see the glass in two positions. What is the height of the water when the glass is upright
Answer:
5 cm.
Explanation:
If the glass is located upright, the height of water is about 5 cm because the height of glass is 10 cm and it is partially filled with water and we know that partial means 50 percent of something and here 50 percent of glass is 5 cm. If the glass is slightly bend, so we can't find its right height so the proper height of water is attain if it is placed on flat table and present upright.
A dodgeball has a mass of 0.50 kg and hits a person in the leg with a velocity of 12 m/s. After hitting
the person, it bounced back with a velocity of 5 m/s. Based on time-lapse video, it was determined
the ball was in contact with the person for 0.07 s. If the change impulse of the collision is 3.5 kg m/s
What is the force exerted when the dodgeball made contact with the person's leg.
Answer:15
Explanation:
If you're driving 55 MPH and you suddenly need to stop, how many feet will you travel before the car comes to a stop
What is the value of n?
Answer:
THE ANSWE IS C
81
Explanation:
Which of the following objects have momentum? Select all that apply.
a
an electron is orbiting the nucleus of an atom
b
a flea walking at a constant speed on a dog's back
c
High School building
d
a Honda Prius moving at 70 mph
e
a UPS truck stopped at the side of the road
a. an electron is orbiting the nucleus of an atom
b. a flea walking at a constant speed on a dog's back
d. a Honda Prius moving at 70 mph
What is momentum?
Momentum can be defined as quantity of motion present in a body. It is also called "mass in motion." All objects have mass so if an object is moving, then it has momentum. In terms of an equation, the momentum of an object is equal to the mass of the object multiply by the velocity of the object.
So in conclusion, option a, b and d having momentum.
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Someone help me please.
Treatment for Common Sports Injuries
Practice
Active
b 21 (3
Explain why the first step in responding to any sports injury is to remove the danger that led to the injury
An object has k.e. of 10J at a certain instant. If it is acted on by an opposing force of 5N, which of the number A to E below is the farthest distance it travels in metres before coming to rest?
A - 2
B - 5
C - 10
D - 20
E - 50
Answer:
d = 2 [m].
Explanation:
To solve this problem we must use the principle of conservation of energy, where the mechanical energy in a state plus the work done on the body, must be equal to the mechanical energy in the state E. This can be easily represented in the following equation.
[tex]E_{A}+W_{A-E}=E_{E}[/tex]
where:
Ea = Mechanical energy in A [J]
Wa-e = Work among states a and e [J]
Ee = Mechanical energy in E [J].
The key to being able to understand this problem is that in state A, we only have kinetic energy, while the energy in state E is equal to zero (there is no movement). The work is equal to the product of force by distance, as work acts in the opposite direction to movement, this has a negative sign.
[tex]10 - F*d = 0\\5*d = 10\\d = 10/5\\d = 2 [m][/tex]
4. A 70.0 kg boy and a 45.0 kg girl use an elastic rope while engaged in a tug-of-war on an icy,
frictionless surface. If the acceleration of the girl toward the boy is 2.25 m/s², find the
acceleration of the boy toward the girl. (3M law : m2 a2 = - ml al)
Given:
ml =
m2 =
a2=
Unknown:
al=?
Equation:
m2 a2= - ml al
Answer:
[tex]a_1 = 1.446m/s^2[/tex]
Explanation:
Given
[tex]m_1 = 70.0kg[/tex] -- Mass of the boy
[tex]m_2 = 45.0kg[/tex] -- Mass of the girl
[tex]a_2 = 2.25m/s^2[/tex] -- Acceleration of the girl towards the boy
Required
Determine the acceleration of the boy towards the girl ([tex]a_1[/tex])
From the question, we understand that the surface is frictionless. This implies that the system is internal and the relationship between the given and required parameters is:
[tex]m_1 * a_1 = m_2 * a_2[/tex]
Substitute values for [tex]m_1, m_2[/tex] and [tex]a_2[/tex]
[tex]70.0 * a_1 = 45.0 * 2.25[/tex]
Make [tex]a_1[/tex] the subject
[tex]\frac{70.0 * a_1}{70.0} = \frac{45.0 * 2.25}{70.0}[/tex]
[tex]a_1 = \frac{45.0 * 2.25}{70.0}[/tex]
[tex]a_1 = \frac{101.25}{70.0}[/tex]
[tex]a_1 = 1.446m/s^2[/tex]
Hence, the acceleration of the boy towards the girl is 1.446m/s^2
Newton's second law of motion states the relationship of mass, acceleration and force. It states that
A. force equals mass divided by acceleration.
B. force equals acceleration divided by mass.
C. force equals mass time acceleration.
D. every object attracts every other object in the universe
Answer:
C
Explanation:
force equals mass time acceleration
plz do it all i will give brainlest and thanks to best answer do it right plz
Answer:
i dont know i will get someone to help u in a minute
Explanation:
Niagara Falls is 51 meters high. If you dropped a ball off the ledge, how much time would it take it to hit the water?
PLEASE SHOW WORK. WILL MARK BRAINLIEST
Answer
t = 3.23s
Explanation:
17. The flow of electric charges though a conductor is known as
a) circuit
b)electric current
c)resistance
d) voltage difference
in which graph is the velocity 0
A drag racing vehicle travels from zero to a hundred miles per hour and 5 seconds north what is acceleration
Which object might have the pattern of magnetic domains shown in the image?
A. A building beam made from iron, not near a magnet.
B. A silk fabrics near a magnet.
C. A fabric made from silk, not near a magnet.
D. An iron beam near a magnet.
Answer: A: a building beam made from iron
Explanation:trust
According to modern atomic theory, where are electrons most likely to be found?
A)inside protons
B)electron orbitals
C)inside the nucleus
D)atomic orbitals
Answer:
Option D - atomic orbitals.
Explanation:
According to modern theory, the region where an electron is most likely to be found is called an atomic orbital.
According to modern atomic theory, electrons are most likely to be found in the atomic orbitals, therefore the correct answer is option D.
What are atomic models?There are most widely accepted atomic models are as follows,
The foundation of John Dalton's atomic theory is the idea that an atom is the basic building block of all physical phenomena in the universe.
J.J. Thomson created the Plum Pudding Model.
Rutherford's concept explained why an atom has a nucleus by using the alpha particle bombardment experiment on a thin sheet of gold.
The rotating behavior of the electrons in the several atomic shells around the atom's nucleus was described by Niels Bohr's model.
Thus, according to modern atomic theory, electrons are most likely to be found in the atomic orbitals, therefore the correct answer is option D
To learn more about the atomic models here, refer to the link;
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If a book with a mass of 5.0 kg, is pushed across a table with a net force of 30. N, what is its acceleration?
Answer:
[tex]a=6\ m/s^2[/tex]
Explanation:
Given that,
Mass of a block, m = 5 kg
It is pushed with a net force of 30 N
We need to find its acceleration. The net force acting on an object is given by :
F = ma
a is the acceleration of the block
[tex]a=\dfrac{F}{m}\\\\a=\dfrac{30\ N}{5\ kg}\\\\a=6\ m/s^2[/tex]
So, the acceleration of the block is [tex]6\ m/s^2[/tex].
2. When can you legally use your cell phone while
driving?
A. Never
B. Whenfmyaiting for a train to pass at a closed gate
C. In case of an emergency
Answer:
never
Explanation:
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Which element is metalloid
Answer:
I think it is Boron
Explanation:
I looked it up but I hope this helps happy holidays!
Help pls (momentum and the J=Δp stuff)
The momentum of the first ball is
(0.0600 kg) (60.0 m/s) = 3.60 kg•m/s
The second ball moves at a speed v so that it has the same momentum, which means
(0.0100 kg) v = 3.60 kg•m/s
v = (3.60 kg•m/s) / (0.0100 kg)
v = 360. m/s
A person pushes a block 4 m with a force of 25 N. How much work is being done?
Answer:
100 JExplanation:
The work done by an object can be found by using the formula
workdone = force × distance
From the question we have
workdone = 25 × 4
We have the final answer as
100 JHope this helps you
I"LL MARK BRAINLIEST!
Two cars are rounding curves. Both cars are traveling at a constant speed of 25 miles per hour. Car A is rounding a very sharp curve and car B is rounding a gradual curve. Which of the following are true regarding the motion of the cars?
A. Car A and B have the same acceleration because they have the same speed.
B. Car A and B have the same acceleration because they have the same velocity.
C. Car A and B both have zero acceleration because their speeds are not changing.
D. Car A is accelerating more than car B because it is changing direction at a faster rate.
Please include an explanation why!!!
This problem will require you to make some assumptions, so be sure that your assumptions are clear. You have dinner reservations at Atrio in Brickell, but the elevator is broken. If you decide to take the stairs does that entitle you to eat the entire Chocolate Fondue for Two dessert by yourself? The Chocolate Fondue for Two is 1 lb. of dark chocolate, served with a variety of fruits for dipping.
Answer:
No
Explanation:
The statement is implying that if you do a certain amount of work, you're entitled to do a certain amount of work. Sometimes, work doesn't entitle you a reward.
Is the wavelength of a wave that has a wave frequency of 125 Hz and a speed of 160000 m/s
Answer:
1280m
Explanation:
Un niño de 25 kg corre por un jardín con una velocidad de 2.5 m/s de forma que su trayectoria es tangente al borde de un carrusel de 500 kg•m2 de momento de inercia y un radio de 2 m, que está parado. El niño salta sobre el carrusel y lo pone en movimiento. Determina la velocidad angular del niño y del carrusel cuando se mueven juntos.
Grupo de opciones de respuesta:
0.25 rad/s
5 rad/s
0.208 m/s
0.208 rad/s
Answer:
La velocidad angular del niño y del carrusel cuando se mueven juntos es 0.208 radianes por segundo.
Explanation:
Asumamos que tanto el niño como el carrusel no tienen carga externa aplicada sobre aquellos, de modo que se puede aplicar el Principio de Conservación de la Cantidad de Movimiento Angular:
[tex]m\cdot v \cdot R = (m\cdot R^{2}+I)\cdot \omega[/tex] (1)
Donde:
[tex]m[/tex] - Masa del niño, medida en kilogramos.
[tex]v[/tex] - Velocidad lineal inicial del niño, medida en metros por segundo.
[tex]R[/tex] - Radio máximo del carrusel, medida en metros.
[tex]I[/tex] - Momento de inercia del carrusel, medida en kilogramo-metros cuadrados.
[tex]\omega[/tex] - Velocidad angular final del sistema niño-carrusel, medida en radianes por segundo.
Si sabemos que [tex]m = 25\,kg[/tex], [tex]v = 2.5\,\frac{m}{s}[/tex], [tex]R = 2\,m[/tex] y [tex]I = 500\,kg\cdot m^{2}[/tex], tenemos que la velocidad angular final es:
[tex]\omega = \frac{m\cdot v\cdot R}{m\cdot R^{2}+I}[/tex]
[tex]\omega = \frac{(25\,kg)\cdot \left(2.5\,\frac{m}{s} \right)\cdot (2\,m)}{(25\,kg)\cdot (2\,m)^{2}+500\,kg\cdot m^{2}}[/tex]
[tex]\omega = 0.208\,\frac{rad}{s}[/tex]
La velocidad angular del niño y del carrusel cuando se mueven juntos es 0.208 radianes por segundo.
The Sun appears to move across the sky during the day. The best explanation for this apparent motion is that Earth is
A)much smaller than the Sun
B) tilted on its axis
C)rotating on its axis
D) revolving around the Sun
Answer:
C
Explanation:
The apparent motion is that Earth is rotating on its axis.
How sun appears to move across the sky during the day?The Sun appears to move across the sky during the day and disappears at the night. The Earth is spinning towards the east. The Earth spins or rotates about its own axis, an imaginary line that runs through the middle of the Earth between the two poles, i.e., North and South poles.In case of the Moon, the spin will gets changed.The main reason for the appearing and disappearing of Sun in the Earth is as Earth rotates in its own axis towards the east. It will not happen because of the Sun's and Earth size, or titled on its axis.
Thus, Option C - rotating on its axis is the correct answer.
Learn more about Earth's rotation on axis,
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if the presence of electricity can be made visible in any part of the circuit, I see no reason why intelligence may not be transmitted instantaneously by electricity. what does this qute mean
Answer:
Intelligence can't be transferred, it can be gained through knowledge.
Explanation:
This quotes means that intelligence can't be transferred from one material to another through any tools such as electricity. it can be gained through knowledge and research. Intelligence refers to the ability to acquire and apply knowledge and skills in our daily activities so intelligence can be gained from getting knowledge and skill through continuous struggle and determination.
