Which of the following are most likely to have similar chemical properties?
A. Elements close in atomic mass
B. Elements in the same period
C. Elements close in atomic number
D. Elements in the same group

The experimental evidence led to the development of have gathered new evidence. One of the atomic models this atomic model from the one before it is the colors of light emitted from heated atoms had very specific energies.

As scientific knowledge about the structure of the atom has changed, so have models of the atom.

The Rutherford planetary model, which depicts electrons travelling around the nucleus like planets move around the sun in the solar system, is the direct precursor of the model illustrated in the figure attached.

This model was created as a result of the study of light hues released by heated atoms with highly particular energies.

The Bohr model of the atom is so named because Niels Bohr had a major role in developing it. The passage of electrons between energy levels caused the light hues released by heated atoms. Electrons are grouped in shells or energy levels.

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Answer:

E-Community

Explanation:

edge 2021

Answer:

The answer would be option E- community

Explanation:

Hope this helped :)

edg 2022

In a binary system, two stars orbit around a common center of mass. One of the unique events that can occur in a binary system is a type of stellar explosion known as a supernova.

This occurs when one of the stars in the binary system runs out of fuel and collapses, causing a massive explosion that can outshine an entire galaxy. Another event that can occur in a binary system is a tidal disruption event, where one star is torn apart by the gravitational forces of its companion star. This can also result in a sudden increase in luminosity, although not as bright as a supernova. In addition, binary systems can also exhibit periodic variations in their luminosity due to eclipses, where one star passes in front of the other from our vantage point on Earth. This can be used by astronomers to study the properties of the stars in the binary system, such as their sizes and masses. Overall, while various events can occur in a binary system, supernovae are thought to have about the same luminosity due to the fact that they are caused by the same type of stellar explosion. This allows astronomers to use them as a standard candle for distance measurements in the universe.

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Answer:

1.2 A

Explanation:

From the diagram attached, The three resistors are parallel because the each ends of the resistors are connected together. Since they are in parallel, the voltage across each resistor is the same. The voltage source connected in parallel to the resistors is 60 V. Therefore the voltage across the 50 Ω resistor is 60 V. Using ohm law:

Voltage (V) = Current (I) × Resistance (R)

V = IR

I = V/R

I = 60 V/ 50 Ω

I = 1.2 A

The current in the 50 Ω resistor is 1.2 A

The wavelength of the standing wave pattern on the 9.0 m long string is 18.0 m.

To determine the wavelength of the standing wave pattern on the 9.0 m long string, we need to analyze the diagram carefully. In a standing wave, nodes and antinodes are formed. Nodes are the points on the string where the displacement is zero, while antinodes are the points of maximum displacement.

In the diagram, we can observe that there are two nodes formed, one at each end of the string. This implies that the string is fixed at both ends, creating a situation known as the fundamental mode or the first harmonic. In this mode, half of a wavelength is equal to the length of the string.

Therefore, the wavelength can be calculated by multiplying the length of the string by 2, since there are two halves in a full wavelength. Thus, the wavelength is 2 times the length of the string: 2 * 9.0 m = 18.0 m.

In conclusion, the wavelength of the standing wave pattern on the 9.0 m long string is 18.0 m.

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Answer:

the foiley like color doesn't absorb the heat it bounces off of it. it would be much better to have a black blanket

The normal force acting on the block is approximately 101.64 N, or 102 N after rounding it off, when it experiences a 24.7 N friction force.  

When a block slides across a surface, the frictional force from the surface acts to prevent the block from moving. This force can be calculated using the formula Ff = k x Fn, where k is the coefficient of kinetic friction and Fn is the normal force acting on the block. This force is also known as the kinetic friction force.

The friction force, Ff, experienced by the block can be calculated using the formula:

Ff = μk x Fn

where μk is the coefficient of kinetic friction and Fn is the normal force acting on the block.

Rearranging the formula, we get:

Fn = Ff / μk

Substituting the given values, we get:

Fn = 24.7 N / 0.243

Fn = 101.64 N (rounded to two significant figures)

Therefore, the normal force acting on the block is approximately 101.64 N.

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Correct question is:

A block sliding on ground where μk = 0.243 experiences a 24.7 N friction force. What is the normal force acting on the block?

The type of chemical reaction that takes place in 2Cr(s) + 3FeCl2(aq) → 2CrCl3(aq) + 3Fe(s) is single displacement reaction.

There are six common types of chemical reactions. They are

Since Cl in FeCl takes the place of CrCl with Cr, there is a displacement taken place. But only one element displaced. So this falls under the category of single displacement reaction.

Therefore, the type of chemical reaction that takes place in 2Cr(s) + 3FeCl2(aq) → 2CrCl3(aq) + 3Fe(s) is single displacement reaction.

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Newton and Einstein believe that the factor directly affects gravity is (a) the mass of objects.

Factor affects gravity:

The force that pulls items toward the center of a planet or other entity is called gravity. As we know gravity is a type of force that is mainly affected by the mass of the object and the distance between the objects. The object which has more mass will have large gravity and a smaller mass has small gravity and when the distance between the objects is smaller then the gravity is larger. Thus, the gravity is directly proportional to the mass of the objects and the inversely proportional to the distance between the objects.

Both Newton and Einstein believe that the gravity directly dependent on the mass of the objects.

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Answer:

Newton and Einstein believe that the factor directly affects gravity is (a) the mass of objects.

Factor affects gravity:

The force that pulls items toward the center of a planet or other entity is called gravity. As we know gravity is a type of force that is mainly affected by the mass of the object and the distance between the objects. The object which has more mass will have large gravity and a smaller mass has small gravity and when the distance between the objects is smaller then the gravity is larger. Thus, the gravity is directly proportional to the mass of the objects and the inversely proportional to the distance between the objects.

Both Newton and Einstein believe that the gravity directly dependent on the mass of the objects.

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Explanation:

The speed at which the straw was embedded in the tree is approximately 112.24 m/s.

To determine the speed at which the straw was embedded in the tree, we can use the concept of work done by a force. The work done is equal to the force multiplied by the distance over which the force is applied.

Given:

Mass of the straw (m) = 0.50 g = 0.0005 kg

Distance embedded in the tree (d) = 4.5 cm = 0.045 m

Stopping force (F) = 70 N

The work done (W) can be calculated as:

W = F * d

W = 70 N * 0.045 m

W = 3.15 J (joules)

To find the initial kinetic energy of the straw (K.E.i), we can equate it to the work done:

K.E.i = W

Finally, we can use the equation for kinetic energy to find the initial speed (v) of the straw:

\(K.E.i = (1/2) * m * v^2\)

Rearranging the equation and plugging in the known values:

\(v^2 = (2 * K.E.i) / m\)

\(v^2 = (2 * 3.15 J) / 0.0005 kg\)

\(v^2 = 12600 m^2/s^2\)

Taking the square root of both sides:

v ≈ 112.24 m/s

Therefore, the speed at which the straw was embedded in the tree is approximately 112.24 m/s.

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To measure motor units in the electromyography (EMG) simulator, the most appropriate method would be measuring the distance between two consecutive peaks of the same type in the green plot. So, option B is correct.

Electromyography is a technique used to evaluate and record the electrical activity produced by skeletal muscles. Motor units consist of a motor neuron and the muscle fibers it innervates. The EMG simulator generates signals that mimic the electrical activity of motor units.

By measuring the distance between two consecutive peaks of the same type in the green plot, we can obtain valuable information about the firing pattern and recruitment of motor units. The peaks represent the action potentials generated by individual motor units.

The distance between peaks can indicate the firing rate or the time interval between successive action potentials.

Counting the number of unique peaks in either the green or blue plot (options A and D) may not provide a comprehensive measure of motor units. It might only give an estimation of the number of active motor units, but it doesn't provide information about their firing patterns or recruitment.

Measuring the largest peak-to-peak value (option C) may not be as informative either because the size of the action potentials can vary depending on factors such as the proximity of the electrode to the motor unit or the intensity of the simulated muscle contraction.

Therefore, measuring the distance between two consecutive peaks of the same type in the green plot is a more reliable method to assess motor units in an EMG simulator, as it provides insights into their firing patterns and recruitment dynamics.

So, option B is correct.

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The "arm" of the lever is the handle or bar; it is the portion that you push or pull against. The point on which the lever rotates or balances is known as the "fulcrum.

The pivotal point of the beam is known as the fulcrum. A load is applied at the other end of a lever when an effort is exerted to one end of the lever. A mass will be raised as a result.

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The motion when she is running directly east is Δx = 11.7 and Δy = 15.

To determine the slope of a line select two points on the line and calculate the delta y change in y value to determine the change in elevation. Divide the change in x value by the delta x to determine the change in width. The derivative of y is the square of x with respect to y.

So the derivative of something squared with respect to something is multiplied by the derivative of that thing with respect to x. That's exactly the chain rule. Yes, it means exactly the same. y in Newton notation and dy/dx in Leibniz notation. Newton and Leibniz independently invented calculus at about the same time, so in this case, they used different notations to express the same rate of change.

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Age of the universe, the age we get is less than the Hubble time

Astronomers estimate the age of the universe in two ways: 1) by looking for the oldest stars; and 2) by measuring the rate of expansion of the universe and extrapolating back to the Big Bang; just as crime detectives can trace the origin of a bullet from the holes in a wall

The universe is thought to be 13.77 billion years old. The distances and radial velocities of other galaxies, the majority of which are eclipsing our own at speeds proportionate to their distances, are used to determine this age.

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Answer:

No not at all. A car speeding up is an example of acceleration.

Answer:

No.

Explanation:

Its a example of decceleration because its slowing down not speeding up. If the car were to go faster then it would be an example of acceleration. Hope this helps :)

Answer: I am assuming it is decreases

Explanation: a straight line is 180 degrees. 2 angles both add up to 180 degrees on a straight line. When one increases, the other has to decrease to keep it 180 degrees on a straight line

The man lying on surface of negligible friction, acquire the speed of 3.18×10-3 m/s in direction opposite to the direction of motion of stone.

No external forces with horizontal components act on the man-stone system and the sum of the vertical forces to zero, so the total momentum of the system is conserved. Since the man and the stone are initially at rest, the total momentum is zero both before and after the stone is kicked.

let Ms be the mass of stone and Vs be its velocity after it is kicked and let Mm be the mass of man and Vm be his velocity after he kicks the stone. Then:

MsVs + MmVm = 0

Vm = -MsVs/Mm

Vm = - 0.075 × 3.7/87

= - 0.00318m/s

= -3.18×10-3m/s

(negative sign indicates the direction velocity of man is opposite to direction of velocity of stone)

Hence, the man acquire the speed of 3.18×10-3m/s in direction opposite to the direction of speed of stone.

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Answer:

What do you need help with?

Answer:

true

Explanation:

Answer:

ln physics, Rest is the state at which an object is stationary or not moving with respect to its surroundings, and is said to be at rest. An example would be a book lying on a table.

Answer:

When an object does not change it's position with respect to time it is said to be at rest.

Explanation:

Example- A person sitting on a chair or a book lying on a table.

Please note there is no such thing as absolute rest.

Take the example of a person A sitting in a moving bus. If the observer is in the bus then to him person A is at rest. However if the observer is is outside the bus then person A is in motion as the bus is moving.

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The waves are of two types and they are transverse and longitudinal waves. Longitudinal waves are mechanical waves that require a medium for propagation and transverse waves are waves that don't require a medium for propagation.

From the given,

The first image of the wave represents the longitudinal waves. The second image of the wave is the transverse wave. For longitudinal waves, A represents the wavelength. Wavelength is defined as the distance between two crests or troughs. B represents the compression of the wave and C represents the rarefaction.

For a transverse wave, D represents the crests of the wave. E is the amplitude of the wave, where the amplitude is the maximum height of the wave. F is the wavelength of the wave and G is the trough of the wave.

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Answer:

Since different colours of light travel at different speeds, the refractive index is different for each colour. As a result, when light passes through the refracting surface of the prism,its components bend into different angles, causing the single beam of light to separate

Once ice has been taken out of the freezer, its molecules start to travel more quickly when heat energy is supplied.

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Answer:

g = 1.25m/s²

Explanation:

Given the following data;

Mass = 5kg

Height = 6m

Gravitational potential energy = 24J

To find the acceleration due to gravity;

Potential energy can be defined as an energy possessed by an object or body due to its position.

Mathematically, potential energy is given by the formula;

\( P.E = mgh\)

Where,

P.E represents potential energy measured in Joules.

m represents the mass of an object.

g represents acceleration due to gravity measured in meters per seconds square.

h represents the height measured in meters.

GPE = mgh

Substituting into the equation, we have;

24 = 5*6*g

24 = 30g

g = 30/24

g = 1.25m/s²

Therefore, the acceleration due to gravity on Planet X is 1.25m/s².

Answer:

g=0.8m/s^2

Explanation:

M=5kg

h=6m

GPE=24J

GPE=Mgh

g=GPE/Mh

g=24J/(5kg)(6m)=0.8

g=0.8m/s^2

For a convex passenger-side mirror the distance from you to the image is  270 cm. distance equal to the object distance is 29.4 m, and 0.0327 m tall. If the mirror were flat the height would be 1.5m. The driver is warned that the objects appear closer because convex mirrors provide a wider field of view but produce smaller images than flat mirrors.

Using the mirror equation

1/f = 1/do + 1/di

where f is the focal length of the mirror, do is the distance of the object from the mirror, and di is the distance of the image from the mirror.

Plugging in f = -80 cm, do = 28 m + 1.4 m = 29.4 m (since the mirror, you, and the cyclist all lie along a line), we get:

1/di = 1/f - 1/do

1/di = -0.0125 cm⁻¹

di = -80 cm / (-0.0125 cm⁻¹) = 640 cm

So, the distance from you to the image of the cyclist is 640 cm - 1.4 m = 270 cm.

If the mirror were flat, then the image would be formed at a distance equal to the object distance, so

Lf = do = 29.4 m

Using the magnification equation

m = -di/do

where m is the magnification of the image.

Plugging in di = 640 cm and do = 29.4 m, we get:

m = -0.0218

Using the formula for image height

h' = -m × h

where h is the height of the object.

Plugging in h = 1.5 m, we get:

h' = -(-0.0218) × 1.5 m = 0.0327 m

So, the image height is 0.0327 m.

If the mirror were flat, then the magnification would be 1, so:

h'f = h × |m| = 1.5 m × 1 = 1.5 m

So, the image height would be 1.5 m.

The mirror on the passenger side of the car is often convex to provide a wider field of view for the driver. However, a convex mirror also makes objects appear smaller than they actually are, and farther away than they actually are.

This is why the warning label is necessary, to prevent the driver from misjudging the distance between their car and objects in the mirror, which could lead to accidents.

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The image of the cyclist would be 58.6 cm away from you in the convex mirror and 29.4 m away in a flat mirror. The height of the cyclist image would be 4.34 cm in the convex mirror and 1.5 m in a flat mirror. The warning label on the passenger-side mirror is to notify the driver that objects may appear further away due to the distorted perspective of the convex mirror.

Part A:
The mirror formula for a convex mirror is 1/f = 1/v + 1/u. Given that f = -80 cm, and object distance(u) is -28m (-2800cm as we need to maintain consistent units).The image distance (v) can be calculated as v = (fu) / (f+u), which gives us v = -81.4 cm.
Considering you are 140 cm from the mirror, the image will form at 140 - 81.4 = 58.6 cm away from you.

Part B:
If the mirror were flat, the image would be the same distance away as the object, but on the other side of the mirror. Therefore, you would be 1.4 m (you to the mirror) + 28 m (mirror to the cyclist) = 29.4 m away.

Part C:
The magnification (m) can be calculated as m = -v/u = 0.029. Since the cyclist is 1.5m tall (150 cm), the height of the image would be m*object height  = 0.029 * 150cm = 4.34 cm.

Part D:
If the mirror were flat, the image height would be the same as the object height. So it would be 1.5 m.

Part E:
The passenger-side mirror is convex to give a larger field of view, but this distorts sizes and distances. Objects seem smaller and further away than they really are, hence the warning for the driver to prevent any potential accident.

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The acceleration is of mother before child reaches half a revolution is,
a) 0.42 radians per second squared b) 0.42 radians per second squared

If both are moving in the same direction, the relative velocity of the child with respect to the mother is the angular velocity of the carousel, which is 2π radians per minute. The mother needs to cover the same distance as the child in half the time, so her relative velocity with respect to the child must be twice the angular velocity of the carousel, which is 4π radians per minute.

To calculate the required acceleration, we can use the formula: acceleration = (final velocity - initial velocity) / time. Since the mother starts from rest and reaches a velocity of 4π radians per minute, the final velocity is 4π radians per minute. The time to cover half a revolution is 30 seconds. Therefore, the acceleration required for the mother to catch up with the child is,

acceleration = (4π - 0) / 30 = 4π/30 ≈ 0.42 radians per second squared

If both are moving in opposite directions, the relative velocity of the child with respect to the mother is the sum of their individual angular velocities. Since the mother is moving in the opposite direction to the carousel, her angular velocity is -2π radians per minute. Therefore, the relative velocity is (2π - (-2π)) = 4π radians per minute.

Using the same formula as before, the acceleration required for the mother to catch up with the child is,

acceleration = (4π - 0) / 30 = 4π/30 ≈ 0.42 radians per second squared

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--The complete question is, A carousel completes 1 revolution every minute. A mother realizes that her child is about to fall and starts moving to protect him when the child already has a 90-degree lead. What acceleration must she reach to catch up with him before the child completes half a revolution? a) If both are moving in the same direction? b) If both are moving in opposite directions?--

Answer:

Explanation:

lThe mass of an object given only it's force and acceleration can be found by using the formula

\(m = \frac{f}{a} \\ \)

f is the force

a is the acceleration

From the question

f = 195 N

a = 2.1 m/s

We have

\(m = \frac{195}{2.1 } = 92.857142... \\ \)

We have the final answer as

Hope this helps you

Answer:

70 Pa.

Explanation:

This is you’re answer

Answer:

d

Explanation:

the answer of the above mentioned question is 2N to the left.

hope this helps!

Answer: velocity would doubled

Explanation:

As we know the k.e relation is given by

K.E= 0.5 m v^2

Keeping the mass same and increasing the k.e 4 times makes the velocity double.