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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17. The flow of electric charges though a conductor is known as
a) circuit
b)electric current
c)resistance
d) voltage difference
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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#SPJ2
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
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:
hjhhhhhhhhhshshsjajsjsjabshdhsdjdjdj
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
HELP HELP in order for energy to transform it must be able to do what?
Answer:
1 thermal to nuclear to mechanical to electrical. 2 thermal to mechanical to nuclear to electrical. 3 nuclear to mechanical to electrical to thermal. 4 nuclear to thermal to mechanical to electrical.
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
The chart shows data for a moving object.
Time (s)
Velocity (m/s)
AN
8
8
8
Which conclusion is best supported by the information
in the chart?
The object has negative displacement.
The object has negative acceleration
The object does not have displacement
The object is not accelerating.
6
Answer:
number 2
Explanation:
in which graph is the velocity 0
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].
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!!!
What is the momentum of a
ball that has a mass of 5kg and a velocity of 3.0m/s? *
Answer:
15 kg.m/sExplanation:
The momentum of an object can be found by using the formula
momentum = mass × velocity
From the question we have
momentum = 5 × 3
We have the final answer as
15 kgm/sHope this helps you
Based on Newton's 3rd law, the force pairs always act on what?
(someone please answer i need help)
Answer:
Newton's third law: If an object A exerts a force on object B, then object B must exert a force of equal magnitude and opposite direction back on object A. This law represents a certain symmetry in nature: forces always occur in pairs, and one body cannot exert a force on another without experiencing a force itself.
Explanation:
Newton's third law: If an object A exerts a force on object B, then object B must exert a force of equal magnitude and opposite direction back on object A. This law represents a certain symmetry in nature: forces always occur in pairs, and one body cannot exert a force on another without experiencing a force itself.
Vector v is plotted below. What is the length of the x-component
of v?
Answer:
The length of the x-component of v is 2
Explanation:
Vectors in Two Dimensions
A vector in the plane can be represented as its two components in the rectangular coordinates (x,y), assuming its initial point is the origin (0,0).
The vector plotted in the image provided has the components (-2,5).
The x-component is -2 and the y-component is 5.
The length of the component is the magnitude or absolute value of the x-coordinate, thus the length of the x-component of v is 2
Which statement is true about rubber, a polymeric material?[1] A.A normal rubber band breaks when the strain is greater than 1. B.A normal rubber band breaks when the strain is less than 10%. C.When a small amount of sulfur is added, to provide cross-links between molecules in rubber, the elastic limit is reduced. D.When a small amount of sulfur is added, to provide cross-links between molecules in rubber, the ultimate tensile stress is reduced.
Answer:
A
Explanation:
Which statement is true about rubber, a polymeric material?
A.) The normal rubber band will break when the strain is greater than 1. Because according to the srain formula,
Strain = extension / original length.
For strain to be greater than one, the extension must have been greater than the original length.
B.) A normal rubber band breaks when the strain is less than 10%. This is not true
C.When a small amount of sulfur is added, to provide cross-links between molecules in rubber, the elastic limit is reduced. Surfur increases the elastic limit
D.When a small amount of sulfur is added, to provide cross-links between molecules in rubber, the ultimate tensile stress is reduced. This is not true. Surfur increases the tensile stress of the elastic material
The correct answer is therefore A
30 POINTS!!!! PLEASE HELP ME!!!!!
Answer:
left column: If you can see some animals, you may see a bird with a fruit or nut in its beak. Once it lets go of the object, it drops due to gravity. If a fruit drops from a tree with examples like in Newton's famous example, it is also due to gravity.
Explanation:
withxamples too.)Right column: Think about it like the moon, you wouldn't be able to walk, just float around. If to simply try to put food on a plate, it wouldn't stay. Sitting down at your table to attend class. You'd float away along with your laptop.(you come up wiht e
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
Convert 15*c in Fahrenheit
Answer:
it is 59 degrees Fahrenheit
I'm pretty sure it's 59 °F
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:
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
What is the value of n?
Answer:
THE ANSWE IS C
81
Explanation:
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
I WILL MARK BRAINLIEST!
A 15 kg wagon is accelerated by a constant force of 80.0 N from a speed of 5 m/s to 15 m/s. For how long was the force acting?
a) 1.0 second
b) 3.1 second
c) 0.05 second
d) 1.9 second
Answer:
I would say b) 3.1 second.
Explanation:
What acceleration will you give to a 24.3 kg box if you push it with a force of 85.5 N?
Heya!!
For calculate aceleration, lets applicate second law of Newton:
[tex]\boxed{F=ma}[/tex]
Δ Being Δ
F = Force = 85,5 N
m = Mass = 24,3 kg
a = Aceleration = ?
⇒ Let's replace according the formula and clear "a":
[tex]\boxed{a=85.5 \ N / 24.3\ kg}[/tex]
⇒ Resolving
[tex]\boxed{ a = 3.51 \ m/s^{2}}[/tex]
Result:
The aceleration is 3,41 meters per second squared (m/s²)
Good Luck!!
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.
Which statement BEST describes the difference between speed and velocity?
A
Speed and velocity are in units of meters per second.
B.
Speed is distance divided by time, and velocity is total distance.
C.
Speed is how fast an object is moving, and velocity includes speed and direction.
D
Velocity is how fast an object is moving, and speed includes speed and direction.
C
Answer:
Because velocity is a vector quantity and also it's described by unit plus direction.
!!!!!PLEASE ANSWER CORRECTLY!! I DESPERATLY NEED HELP!!!!!
Answer:
b
Explanation:
A drag racing vehicle travels from zero to a hundred miles per hour and 5 seconds north what is acceleration
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
