Answer:
Rutherford described the atom as consisting of a tiny positive mass surrounded by a cloud of negative electrons. Bohr thought that electrons orbited the nucleus in quantised orbits. Bohr built upon Rutherford's model of the atom. ... So it was not possible for electrons to occupy just any energy level.
Explanation:
Rutherford's model described electrons in orbits like a solar system, which would lead to collapse, whereas Bohr's model introduced quantized orbits that explained atomic stability and spectra.
The main difference between Rutherford's model of the atom and Bohr's model of the atom lies in how they describe the behavior of electrons around the nucleus. Rutherford's model predicted a miniature solar system with electrons in circular or elliptical orbits that, according to classical mechanics, would cause the atom to collapse due to continuous electromagnetic radiation emission. However, Bohr's model introduced the concept of quantized orbits, assuming electrons to move in circular orbits with quantized energies, angular momentum, and radii based on the quantum number 'n.'
Bohr's quantum theory was a significant advancement as it explained why electrons do not radiate energy as they orbit the nucleus. In Bohr's model, electrons remain in their quantized orbits without emitting electromagnetic radiation, but when an electron transitions between orbits, the atom emits or absorbs electromagnetic radiation, resulting in discrete spectra that align with observational evidence. This model, while still incorporating aspects of classical mechanics, corrected the stability issue of the atom and provided a basis for explaining atomic spectra, particularly that of hydrogen.
The fundamental mode of vibration of a wave is defiened as that which as the lowest ____.
Answer:
Frequency
Explanation:
Answer:
Frequency
Explanation:
hi this is a two part question please help!
12. What is the net force on the box above? *
1 point
A. 10 N
B. 15 N
C. 25 N
D. 30 N
13. In which direction will the box from above move? *
1 point
A. Right
B. Left
C. It will not move.
Hi!
So I don't know what the heck net force is, but I think the box would move right because there is more force moving to the right.
A vase with a mass of 0.800 kilograms falls from a height of 0.750 meters to a position of 0.500 meters above the floor. Ignoring frictional effects, the total mechanical energy at the 0.500 position is _____.
Answer:
E= 2 J
Explanation:
For this case we see how the mechanical energy is generated by the potential energy due to the change of position. We can express that as
E=m*g*h
Being "m" the mass of the object, "g" the value of the acceleration by gravity and "h" the distance traveled in the movement. So
E=m*g*h=0.8Kg*10m/s2*(0.75-0.5)=2J
Done
14. Copernicus's model of the universe differs from Ptolemy's because Copernicus believed
A. The sun and Earth share a central point from which the other planets rotate around them.
B. Earth rotates on its axis and orbits the sun.
C. Earth orbits the sun but remains stationary on its axis.
D. Earth is still at the center but rotates on its axis.
Answer:
B. Earth rotates on its axis and orbits the sun.
Explanation:
The model given by Ptolemy was a geocentric model. It described Earth as the center of the universe and remains stationary on its axis.
Copernicus gave a heliocentric model. The sun is at the center of the solar system and Earth revolves around the sun as well as rotates on its axis.
Thus, the correct option is B.
Copernicus's heliocentric model places the Sun at the center with Earth rotating on its axis and orbiting the Sun. This is in contrast to Ptolemy's geocentric model where Earth is at the center.
Nicolaus Copernicus's model of the universe is known as the heliocentric model, which is different from Ptolemy's geocentric model. Copernicus suggested in 1543 that the Sun is at the center of the universe, and Earth, along with the other planets, orbits around it. This model was more straightforward and accurate compared to the Ptolemaic system, which had Earth at the center and required complex mechanisms like epicycles and deferents to describe planetary motions. The correct statement regarding Copernicus's belief is B. Earth rotates on its axis and orbits the sun.
A train of mass 320000 kg accelerate uniformly from rest. It takes 57 s to travel a distance of 810 m in a straight line. Find the average net force acting on the train.
Answer:
160,000 N
Explanation:
Given:
m = 320,000 kg
v₀ = 0 m/s
a = constant
t = 57 s
Δx = 810 m
Find: Fnet
Apply Newton's second law:
∑F = ma
Fnet = ma
To find Fnet, we must first find the acceleration.
x = x₀ + v₀ t + ½ at²
810 m = 0 m + (0 m/s) (57 s) + ½ a (57 s)²
a = 0.50 m/s²
Fnet = (320,000 kg) (0.50 m/s²)
Fnet = 160,000 N
A plane passes over point a with a velocity of 5000 m/s north. Sixty seconds later it passes over point b at a velocity of 10,000 m/s north. What is the plane’s acceleration from A to B?
Answer:
The plane’s acceleration from A to B is
[tex]a =83.33\ m/s^2[/tex]
Explanation:
The acceleration of an object is a measure of how its speed changes over time.
In this case, we know that the plane initially has a velocity of 5000 m/s when it passes through point A, and when it passes through point B, 60 seconds later it has a velocity of 10,000 m/s.
Then the average acceleration is calculated as
[tex]a =\frac{s_2-s_1}{t_2-t_1}[/tex]
Where
[tex]s_2 = 10 000[/tex] is the final speed
[tex]s_1=5000[/tex] is the initial velocity
[tex]t_2 -t_1=60[/tex] is the time it took for the object to reach the final speed
Then
[tex]a =\frac{10000-5000}{60}[/tex]
[tex]a =\frac{5000}{60}[/tex]
[tex]a =83.33\ m/s^2[/tex]
What is the main reason water from the ocean turns to water vapor , and then evaporates into the air
A) ocean breezes
B) changing tides
C) heat from the sun
D) moons gravitational pull
Hello! :)
C) heat from the sun
Why?
Because the sun’s heat makes the water turn to steam—or what we call “water vapor.”
Hope this helped and I hope I answered in time!
Good luck!
~ Destiny ^_^
Answer: C
Heat From the Sun
How Do I Know?
SCIENCE
The coefficient of kinetic friction between Gary's shoes and the wet kitchen
floor is 0.21. If Gary has a mass of 115 kg, what is the force of kinetic friction
acting on him as he slides across the floor?
O A. 237 N
O B. 587 N
O C. 316 N
O D. 1127 N
A. 237 N. The force of kinetic friction acting on him as he slides across the floor is Fk ≅ 237 N.
The equation of the force of kinetic friction is given by Fk = μk*N, where n = m*g. We know that the coefficient of kinetic friction between Gary's shoes and the wet kitchen floor is μk = 0.21, and Gary has a mass of 115kg. Substituting the values:
Fk = μk*n
Fk = (0.21)(115kg*9.8m/s²)
Fk = 236.67 N
Fk≅ 237 N
Answer:
237 N
Explanation:
A P E X
Which of the following is the best thermal conductor?
A. Wood
B. Copper
c. Plastic
D. Paper
The best thermal conductor is copper.
Thermal conductivity:Thermal conductivity is the measurment of materials ability to pass heat through it.
Materials with a higher thermal conductivity can effectively pass heat and easily take up heat from their environment.
Poor thermal conductors puts resistance to heat flow and take heat slowly from the surroundings.
The thermal conductivity can be measured in Watts per meter per degree Kelvin (W/m•K).
Copper thermal conductivity is 398 W/m•K which is more than wood, plastic and paper.
Therefore the correct answer is copper (option B)
To learn more thermal conductivity, refer:
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The atomic number of a nucleus is the number of: A electrons B protons C neutrons D nucleons
Answer:
B protons
Explanation:
- The atomic number of a nucleus (often labelled with Z) is the number of protons inside the nucleus
- The mass number of a nucleus (often labelled with A) is the sum of the protons and the neutrons inside the nucleus
- The number of electrons in a neutral atom is equal to the number of protons inside the nucleus
Therefore, the correct answer is
B protons
However, A (electrons) could also be considered correct if we are talking about a neutral atom.
Match each type of wave to the way it moves.
transverse wave
longitudinal wave
electromagnetic wave
back and forth at right angles to the direction of the motion of the wave
arrowRight
two alternating waves moving at right angles to each other
arrowRight
back and forth in the direction of the motion of the wave
arrowRight
Answer:
Transverse wave- Back and forth at right angles to the direction of the wave arrow.
longitudinal wave- bask and forth in the direction of the motion of the motion of the wave.
electromagnetic wave- two alternating waves moving at right angles to each other.
Explanation:
In a longitudinal wave, the particles vibrate at right angles in reference to the wave motion.
In a transverse wave, the particles vibrate parallel to the wave motion
Electromagnetic waves occur as a result of the interaction between two waves and are normally transverse in nature.
Answer:
Transverse wave ---> back and forth at right angles to the direction of the motion of the wave.
Electromagnetic wave ----> two alternating waves moving at right angles to each other.
Longitudinal wave ----> back and forth in the direction of the motion of the wave.
Explanation:
In the formula C12H22011 how many atoms and elements are there?
Answer:
Explanation:
12 + 22 + 11 = 45
There are 45 atoms, and there are three elements: C, H, and O.
the heat from the sun mainly comes by
Answer:
The Sun. The heat that eventually causes the earth to warm actually comes from the sun. The sun is a huge ball of gases, mainly hydrogen. Every day, the hydrogen in the sun is converted into helium through millions and millions of chemical reactions.
Does this help?
Please answer these questions
30 points
Answer:
if i were you i would try to do the work because if you let someone else you wont be able to understand the question
Hello There!
Where is fluid pressure greatest? "2 meters below the surface of a swimming pool."
#13 "the weight of the fluid displaced by the object"
#14 25 N•m
#15 "5"
1)
Consider the four phases of matter. How do the characteristics of a liquid differ from a solid? All BUT ONE applies.
A) Energy has increased.
B) Temperature has increased..
C) Molecules begin to vibrate.
D) Intermolecular attraction decreased.
2)
The fourth state of matter, plasma, exists when what happens?
A) The atoms in a gas become ionized.
B) The atoms in a gas undergo nuclear fission.
C) The atoms in a gas lose all intermolecular attraction for one another.
D) When electromagnetic forces causes the atoms to stop colliding with one another.
Answer:
1) A, C, and D
2) D
Explanation:
1) In ice, for instance, the temperature decreases to become a solid, so B does not apply.
2) In most plasma's, the atoms don't collide into each other.
Answer:1 C
2 A
Explanation:
Liquids tend to gain more kinetic energy than solids. Energy is related with temperature. As the kinetic energy is increased so also is the temperature. This increase in temperature reduces the intermolecular attraction in solids.
Plasma comprise of positively Charged and negatively charged particles and occurs when the atoms in a gas becomes ionized.
What is the gravitational force between two trucks, each with a masof 2.0x10^4 k
That are 2.0m apart
Answer:
[tex]6.67\cdot 10^{-3} N[/tex]
Explanation:
The gravitational force between two objects is given by
[tex]F=G\frac{m_1 m_2}{r^2}[/tex]
where
G is the gravitational constant
m1, m2 are the two masses
r is the separation between the two masses
In this problem, we have
[tex]m_1 = m_2 = 2.0 \cdot 10^4 kg[/tex] the mass of each truck
r = 2.0 m is their separation
Substituting,
[tex]F=(6.67\cdot 10^{-11}) \frac{(2.0\cdot 10^4 kg)^2}{(2.0 m)^2}=6.67\cdot 10^{-3} N[/tex]
The gravitational force between the two trucks is calculated using Newton's Universal Law of Gravitation. The force is very small due to the relatively small masses of the trucks compared to large bodies like the Earth.
Explanation:The gravitational force between the two trucks can be calculated using Newton's Universal Law of Gravitation. This law is given in the form F = G * (M1 * M2) / R², where F is the gravitational force, G is the gravitational constant (6.67 × 10^-11 Nm²/kg²), M1 and M2 are the masses of the two bodies in kilograms, and R is their separation in meters.
For the two trucks, the equation can be applied as follows: F = 6.67 × 10^-11 Nm²/kg² * ((2.0x10^4 kg) * (2.0x10^4 kg)) / (2.0 m)². This gives us the gravitational force that the two trucks exert on each other.
It is worth noting that while the gravitational forces between such small bodies are noticeable, they are extremely small. This is consistent with our everyday experience that we do not feel the gravitational force of other nearby objects, but only the force exerted by the Earth, which is of a much larger mass.
Learn more about Gravitational Force here:https://brainly.com/question/32609171
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99 POINTS
1.) Balance the following chemical equation: ___KOH + ___H₃PO₄ → ____K₃PO₄ + ___H₂O
2.) Balance the following chemical equation: ___Al(OH)₃ + ___HCl → ___AlCl₃ + ___H₂O
3.) Balance the following chemical equation: ___Fe₂O₃ + ___CO → ___CO₂ + ___Fe
4.) Balance the following chemical equation: ___AgI + ___Fe₂(CO₃)₃ → ___FeI₃ + ____Ag₂CO₃
There are four blanks on each and if there is no coefficient needed place a "1" in the blank
Answer:
Send a pic of it so i can mark it.
Explanation:
Which of the following BEST describes the energy involved in an exothermic chemical reaction before the reaction?
In an exothermic chemical reaction, energy is stored in the bonds of reactants before the reaction. It's higher than the energy of the products, hence when the reaction takes place, energy is released typically as heat.
Explanation:In a typical exothermic chemical reaction, energy is stored in the chemical bonds of the reactants before the reaction. This energy is higher than that of the product molecules which arise after the reaction. When the reaction takes place, the stored energy is released as heat. This is why the reaction is called 'exothermic', as 'exo' means 'out' and 'thermic' means 'heat'.
An example of an exothermic reaction is the burning of natural gas. In this process, natural gas (methane) reacts with oxygen and release a large amount of energy as heat and light. So, in simple terms prior to an exothermic reaction, the reactants possess a relatively larger potential energy as compared to the products.
Learn more about Exothermic chemical reaction here:https://brainly.com/question/35869321
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Acceleration can be found using a speed-time graph. Please select the best answer from the choices provided T F
Answer:
False
Explanation:
Acceleration is defined as the rate of change of velocity:
[tex]a=\frac{\Delta v}{\Delta t}[/tex]
On a speed-time graph, the slope of the curve gives the magnitude of the acceleration. In fact, the slope of the curve in a speed- time graph is
[tex]m=\frac{\Delta y}{\Delta x}[/tex]
where
[tex]\Delta y[/tex] is the increment in the y-variable, so it corresponds to the change in speed
[tex]\Delta x[/tex] is the increment in the x-variable, so it corresponds to the change in time
so the slope corresponds to
[tex]m=\frac{\Delta v}{\Delta t}[/tex]
which is the magnitude of the velocity. However, in order to define acceleration we need an additional piece of information: the direction. Since speed is a scalar, direction of motion is not provided, so we cannot fully define acceleration from a speed-time graph.
which of thWhich of the following is a true statement?
A. Electric fields increase in strength as you move farther from the charge, but electric forces decrease.
B. Both electric fields and forces decrease in strength as the distance increases.
C. Electric fields don't change in strength with distance from a charge, but electric forces do.
D. Electric forces stay the same as distance changes, but electric fields change.e following is a true statement
Answer:
B. Both electric fields and forces ...
Explanation:
Answer:
B. Both electric fields and forces decrease in strength as the distance increases.
Explanation:
from the Coulomb's law
[tex]F=\frac{k q_{1} q_{2} }{r^{2}}[/tex]
electrif field is also expressed as
F = qE., so
[tex]E = \frac{k q}{r^{2}}[/tex]
it can seen that electric force and electric field and dependent on distance. that is inverse square of distance.
so, if the electric force and eletric field decreases in strength, it is because the distance of separation has increased.
How can an object have KE
Answer:
Explanation:
If it moves, the object has KE. The formula for KE is
KE = 1/2 mv^2
In order to have a measurable KE, you only need the object to have a mass (m) and a speed(v). If it has those two things, it has KE.
A student wants to lift a 350 N bucket of water up from the bottom of a well using a wheel and axle. The wheel has a
radius of 55 cm, and the axle has a radius of 15 cm. How much force will the student need to provide to the wheel to
turn it and lift the bucket?
28.8 N
4242 N
1283 N
95.5 N
Final answer:
The student will need to provide a force of approximately 95.5 N to turn the wheel and lift the bucket of water.
Explanation:
To calculate the force the student needs to provide to the wheel, we can use the concept of mechanical advantage. The mechanical advantage of a wheel and axle is given by the ratio of the radius of the wheel to the radius of the axle. In this case, the mechanical advantage is:
MA = radius of wheel / radius of axle
MA = 55 cm / 15 cm
MA = 3.67
Therefore, the force the student needs to provide to the wheel is:
Force = 350 N / MA
Force = 350 N / 3.67
Force ≈ 95.5 N
A mover hoists a 50 kg box from the ground to a height of 2 m. What was the change in the box's energy
Answer:
980 J
Explanation:
The change in box's energy is equal to its change in gravitational potential energy:
[tex]\Delta U = m g \Delta h[/tex]
where
m = 50 kg is the mass of the box
g = 9.8 m/s^2 is the acceleration due to gravity
[tex]\Delta h= 2m[/tex] is the change in height of the box
Substituting numbers, we find
[tex]\Delta U = (50 kg)(9.8 m/s^2)(2 m)=980 J[/tex]
Answer:
This is late, but your answer would be 1,000 J
Explanation:
How I got my answer was I used the Gravitational Potential Energy Calculator on the calculator soup. the answer I got when I plugged 50 and 2 into the calculator is 980, but since it's not on the list of choices, I went with the closest one, 1,000 J
I got it correct on my test; here is the proof
name three states of matter?
Hello!
There are actually four states of matter. The three main ones are solids, liquids and gasses. The fourth one is called plasma.
Solids have a definite shape and volume.
Liquids have a definite volume but not shape.
Gas doesn’t have a definite volume or shape.
Plasma is like gas but made of electricity charged particles and very hot.
17. A figure skater skating across ice, who grabs another skater and brings him along the ice with her, is an example of what type of collision?
A. Mass collision
B. Inelastic collision
C. Parallel collision
D. Elastic collision
Answer:
B. Inelastic collision
Explanation:
There are two types of collision:
- Elastic collision: in an elastic collision, both the total momentum of the objects and the total kinetic energy of the objects involved are conserved before and after the collision
- Inelastic collision: in an inelastic collision, the total momentum of the objects is conserved before and after the collision, while the total kinetic energy is not - in fact, some of the kinetic energy is converted into other forms of energy (such as thermal energy) due to the presence of frictional forces
In particular, a perfectly inelastic collision is an inelastic collision in which the two objects stick together after the collision: in such a situation, the amount of kinetic energy "lost" (=converted into other forms) is maximum.
In the situation described in the problem, the two skaters stick together after the collision, so this is an example of perfectly inelastic collision.
Copernicus's model of the universe differs from Ptolemy's because Copernicus believed
Answer:
That the Sun was the center of the universe.
Explanation:
Ptolemy believed in geocentrism, which means that the Earth is the center of the Universe. This was also supported by Aristotle. Copernicus on the other hand believed in a heliocentric system, which proposes that the sun is the center of the universe.
Answer:
Earth rotates on its axis and orbits the sun.
Explanation:
Ptolemy believed earth is stationary and is located at the center of the universe. Every celestial object moves around the earth.
It was easier to assume that the earth is not moving since it appears to be stationary to people dwelling on it and to assume that the celestial objects are actually rotating the earth since they appear to be moving.
This is the perfect example that looks can be deceiving. In the ancient times the circle is believed to be a divine shape since it is perfect and the two major celestial objects, the sun and the moon, moves in a circular path. But it turns out, not everything rotates the earth in circular orbit. So Ptolemy proposed nested circular orbits. Which was so complex and farfetched.
Copernicus, a student of Tycho Brahe, (remember Tycho Brahe is an advocate of geocentric theory) inherited Tycho brahe's records of the movements of mars. He could not explain the retrograde motion of mars within the limits of geocentric theory.
He then suggested to remove the concept of divinity, associated with the earth being the center of all universe and to treat earth like every other celestial object. He was the first ever radical who steered us on the right path. In his heliocentric theory, earth rotates on its axis and orbits the sun. This can explain the retrograde motion of mars very easily
You turn on the faucet for your garden hose and let go immediately the end search flying around and spraying water everywhere which of newtons laws of motion does this motion represent
In the following circuit, the supplied voltage is 1.5 volts and the resistor value is 2 ohms. Use Ohm's law to determine the current in the circuit.
3.0 amps
0.75 amps
3.5 amps
1.3 amps
Answer:
0.75 Amps
Explanation:
I had this question and this was right
Answer:
Current, I = 0.75 amps
Explanation:
Given that
Supplied voltage, V = 1.5 volts
Value of resistor, R = 2 ohms
Ohm's law to used to determine the current in the circuit. Mathematically, it is given by :
V = I R
I = current flowing in the circuit
[tex]I=\dfrac{V}{R}[/tex]
[tex]I=\dfrac{1.5\ V}{2\ ohms}[/tex]
I = 0.75 amps
So, the current flowing in the circuit is 0.75 amps. Hence, the correct option is (b) ''0.75 amps''.
The graph below show how natural processes and human activities affect climate
Answer:here’s the graph d
Explanation:
Apex
What is electrostatic force?
Answer:Physicists deal with the four fundamental forces, which are the gravitational force, weak nuclear force, strong nuclear force, and electromagnetic force. The electrostatic force is associated with the electromagnetic force. Here is the definition of electrostatic force, its history, and a look at how it's calculated
Explanation:
Answer:
Electrostatics is a branch of physics that studies electric charges at rest. Since classical physics, it has been known that some materials such as amber attract lightweight particles after rubbing.
Explanation:
Electrostatic forces are attractive or repulsive forces between particles that are caused by their electric charges. This force is also called the Coulomb force or Coulomb interaction. It is named for the French physicist Charles-Augustin de Coulomb, who described the force in 1795.