For a substance to change from a liquid to a solid, what must happen to its
particles?
O A. They must lose enough of their kinetic energy that their movement
is influenced by the attractions between them.
B. They must gain enough kinetic energy to allow them to move
freely while still being attracted to one another.
C. They must lose enough of their kinetic energy so that the
attractions between them hold in place as they vibrate.
D. They must gain enough kinetic energy to break out of their rigid
structure and move independently.

The coefficient of friction can be calculated by dividing the friction force by the normal reaction force. In this case, the coefficient of friction is 0.64.

Coefficient of friction (μ) is defined as the ratio of the frictional force to the normal reaction force. So, we can use the given formula,
Coefficient of friction (μ) = Frictional force (f)/Normal reaction force (N)

Calculate the friction force by dividing the normal reaction force by the coefficient of friction:
Friction force = Normal reaction force / Coefficient of friction
Friction force = 120 N / 0.64
Friction force = 77.4 N

Calculate the coefficient of friction by dividing the friction force by the normal reaction force:
Coefficient of friction = Friction force / Normal reaction force
Coefficient of friction = 77.4 N / 120 N
Coefficient of friction = 0.64


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Answer:

The penguins are gliding foward without stopping because there is no external force changing their state.

Explanation:

Newtons first law states that every object will remain at rest or in uniform motion in a straight line unless compelled to change its state by the action of an external force.

Answer:

Home run

Explanation:

i play

The work done on a body when it is lifted through a height h appears in the form of its potential energy. Therefore, option (b) is the correct answer.

What is Geothermal Energy?

Geothermal energy is a type of renewable energy that is derived from the heat generated deep beneath the Earth's surface. It is produced by harnessing the naturally occurring heat from the Earth's core, which can be used to generate electricity or heat buildings directly. This energy can be accessed by drilling deep wells into the Earth's crust and tapping into the hot water and steam that is naturally present in underground reservoirs.

When a body is lifted through a height h, the work done on it appears in the form of potential energy. This is because the energy is stored in the body due to its position or configuration, rather than its motion.

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The correct option is (B) flow involves the greatest amount of water in mass movements.

The mass movement that involves the greatest amount of water among the options provided is option (B) flow. Flow refers to the movement of a mass of material, such as soil or sediment, that is saturated with water and moves downslope as a viscous fluid.

Unlike other mass movements that primarily involve the movement of solid material, flow incorporates a significant amount of water, which acts as a lubricant, allowing the material to flow more easily.

This water-saturated mass can travel rapidly and cover a large area, making it the mass movement with the greatest involvement of water among the given choices.

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Answer:

Im answering for free points sry

Explanation:

...

The coefficient of kinetic friction between the cart and the track is 0.058 and the coefficient of static friction between the cart and the track is 0.13.

To determine the coefficient of kinetic friction, we can use the formula

\(F_{friction} = \mu_k * F_N,\)

where F_friction is the force of friction, μ_k is the coefficient of kinetic friction, and F_N is the normal force.

The normal force is equal to the force of gravity acting on the cart perpendicular to the track, which is given by

\(F_N = m * g * cos(10),\)

where m is the mass of the cart, g is the acceleration due to gravity, and 10 degrees is the angle of the track.

Plugging in the given values, we get

\(F_{friction} = \mu_k * (m * g * cos(10))\) and solving for μ_k, we get \(\mu_k = F_{friction} / (m * g * cos(10)) = 0.058.\)

To determine the coefficient of static friction, we can use the formula

\(F_{friction, max} = \mu_s * F_N,\)

where F_friction,max is the maximum force of static friction, μ_s is the coefficient of static friction, and F_N is the normal force.

Since the cart is at rest, the force of friction must be equal and opposite to the force component pulling the cart down the incline, which is \(F_{gravity} = m * g * sin(7)\), where 7 degrees is the angle of the track.

The normal force is given by F_N = m * g * cos(7). Plugging in the given values, we can solve for μ_s and get

\(\mu_s = F_{friction,max} / F_N = F_{gravity} / F_N = (m * g * sin(7)) / (m * g * cos(7)) \\\)

= tan(7) = 0.13.

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This one is leisure for people with common sense. Yellow is an assortment of two of the rudimentary colors, red and green. Yellow appears yellow because red light is being imaged in our eyes, so that's one thing. Green reflections are capable of being enthralled by the shirt; hopefully, this should be meticulous adequate for you to have a basic understanding of this "phenomenon". Cheers!

A yellow T-shirt appear yellow to human eye because it reflects both red and green lights and our eye detects it as a combination of two fundamental colors (red and green), which is yellow.

Color is a perception. Our eyes sense something (the sky, for instance), and information is transferred from our eyes to our brains informing us that it is a particular color (blue). Different combinations of wavelengths of light are reflected by objects. When our brains detect certain wavelength combinations, they transform them into the phenomena known as color.

There has three fundamental color: red, blue and green. Red and green lights are combined to create yellow light. If a shirt reflects both red and green light, it appears yellow to human eyes. These two fundamental colors of light must be present in the incident light for red and green light to reflect yellow light to human mind.

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A rocket can change direction in space by utilizing the principle of conservation of momentum and employing various propulsion techniques.

Newton's third law states that for every action, there is an equal and opposite reaction. Rockets take advantage of this principle by expelling high-velocity exhaust gases in one direction, resulting in a reactive force that propels the rocket in the opposite direction, allowing it to change its direction of motion.

To change direction, a rocket can use thrusters or engine gimballing. Thrusters are small engines that can be fired in different directions to provide the necessary force for altering the rocket's path. Engine gimballing involves swiveling the rocket engine, allowing the exhaust gases to be expelled at an angle, thus changing the direction of the rocket.

Another method involves gravity assists or slingshot maneuvers. By utilizing the gravitational pull of celestial bodies, such as planets or moons, a spacecraft can change its trajectory and direction. The spacecraft can perform a carefully calculated flyby, using the gravity of the celestial body to gain speed or alter its trajectory.

In summary, rockets change direction in space by utilizing the principles of conservation of momentum, Newton's third law, and employing techniques like thrusters, engine gimballing, or gravity assists. These methods enable the spacecraft to alter its course and navigate effectively even in the vacuum of space.

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Answer:

its c. 9km

Explanation:

Because it you add the 4km+5km that gives you a total of 9km

In order to avoid injury to driver, The force constant of this spring should be 73.82 N/m

Calculation of force constant to this spring:

Here  

vertical drop is 15 m.

mass of the car, m= 113 kg

gravitational acceleration, g= -9.8 m/s^2

spring compression before car stops, x= 3.0 m

In order to avoid injury to the driver,

we need to use Hooke's law and Newton's second law:

F(net) = F(x)

m*a=-k*x

here a=g

k= -(m*g) / x

here k is force constant of this spring

substituting the values we get,

k = -(113* -9.8) / (15)

k = 73.8266 N/m

Hence,  the force constant of this spring should be 73.82 N/m

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Answer:

true

Explanation:

Answer:

2970dB

Explanation:

30 x99=2970

The value of n for a Bohr orbit with a radius of 1.00 mm is approximately 137.

In the Bohr model of the hydrogen atom, the radius of the electron orbit is given by the formula:

r = (0.529 Å) * n^2 / Z

Where:

r is the radius of the orbit

n is the principal quantum number

Z is the atomic number (which is 1 for hydrogen)

Given that the radius of the orbit is 1.00 mm, we can convert it to angstroms (Å) since the Bohr radius is typically expressed in angstroms. 1 mm is equal to 10,000 Å.

r = 1.00 mm = 10,000 Å

Plugging the values into the formula, we have:

10,000 Å = (0.529 Å) * n^2 / 1

Simplifying the equation:

n^2 = 10,000 Å / 0.529 Å

n^2 ≈ 18,913

To find the value of n, we take the square root of both sides:

n ≈ √18,913

n ≈ 137.43

Since the principal quantum number, n, must be a positive integer, we round it to the nearest whole number:

n ≈ 137

To determine the energy of the excited hydrogen atom in this orbit, we use the formula for the energy of the hydrogen atom in the Bohr model:

E = -13.6 eV / n^2

Plugging in the value of n:

E = -13.6 eV / (137^2)

E ≈ -13.6 eV / 18,769

E ≈ -7.25 × 10^-4 eV

The energy of the excited hydrogen atom in this orbit is approximately -7.25 × 10^-4 eV. The negative sign indicates that the electron is in an excited state with higher energy than the ground state.

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If a star has less than 20 Solar Masses when it collapses, then it will form a compact object about 20 km in diameter called a  neutron star with part of the matter, and the rest of the matter will explode outward in a Type II supernova.

Define neutron stars

A big star that runs out of fuel and collapses gives birth to neutron stars. Each proton and electron are combined into a neutron as the core of the star, which is its most central area, collapses.

A neutron star makes up the remaining fragment. It collapses much more and turns into a black hole if the remnant has a mass larger than around 3 M. The majority of the angular momentum in the core of a big star is retained as it collapses into a neutron star during a Type II supernova, Type Ib supernova, or Type Ic supernova.

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The unknown metal with a mass of 39.27 g is potassium with the symbol K.

The mass of an atom is due to protons and neutrons present in it.

The protons and neutrons are together present in the nucleus of an atom.

The mass of any element is given by its mass number whose formula is

Mass Number = Number of protons + Number of neutrons

In the given case 39 = Number of protons + Number of neutrons

The only element of the periodic table which satisfies the above equation is potassium because it has 19 protons and 20 neutrons.

Thus, the unknown metal with a mass of 39.27 g is potassium with the symbol K.

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Answer:

Explanation:

To calculate the energy density of the wire, we need to first calculate the strain energy stored in the wire.

The strain energy stored in the wire can be calculated using the formula:

U = (1/2) * F * deltaL

where U is the strain energy, F is the applied force, and deltaL is the change in length of the wire.

Here, the applied force is 200 N, and the change in length of the wire is 1.5 mm = 0.0015 m.

So, the strain energy stored in the wire is:

U = (1/2) * 200 N * 0.0015 m = 0.15 J

Now, we need to calculate the volume of the wire to determine the energy density.

The volume of the wire can be calculated using the formula for the volume of a cylinder:

V = pi * r^2 * L

where V is the volume, r is the radius, and L is the length of the wire.

Here, the radius of the wire is 1 mm = 0.001 m, and the length of the wire is 10 m.

So, the volume of the wire is:

V = pi * (0.001 m)^2 * 10 m = 7.853 x 10^-6 m^3

Finally, we can calculate the energy density of the wire using the formula:

Energy density = Strain energy / Volume

Energy density = 0.15 J / 7.853 x 10^-6 m^3

Energy density = 19,102,077.34 J/m^3

Therefore, the energy density of the copper wire is 19,102,077.34 J/m^3.

PLS MARK ME BRAINLIEST

Answer:

B) A body at rest will stay at rest

Explanation:

A body in motion will stay in motion unless acted on by another force.

Answer:

Air is what you breath in

The work done in stretching the spring from its natural length to a length of 0.6 meters is 1.875 Joules.

To find the work done in stretching the spring from its natural length to a length of 0.6 meters, we can use Hooke's Law and the concept of work.

Hooke's Law states that the force exerted by a spring is directly proportional to its displacement from its natural length. Mathematically, it can be expressed as F = kx, where F is the force, k is the spring constant, and x is the displacement.

In this case, we are given that it takes a force of 15 newtons to keep the spring extended an additional 0.04 meters. This means that the displacement is 0.04 meters and the force is 15 newtons. We can rearrange Hooke's Law to solve for the spring constant: k = F / x = 15 N / 0.04 m = 375 N/m.

To find the work done in stretching the spring from its natural length (0.5 meters) to a length of 0.6 meters, we need to calculate the area under the force-displacement curve. The work done is equal to the area under the curve, which can be found using the formula W = (1/2) k x^2, where W is the work done, k is the spring constant, and x is the displacement.

Plugging in the values, we have: W = (1/2) * 375 N/m * (0.6 m - 0.5 m)^2 = (1/2) * 375 N/m * (0.1 m)^2 = 1.875 J.

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According to Newton's second law of motion, the acceleration of an object is directly proportional to the force applied to it and inversely proportional to its mass. So, as the mass of an object increases, its acceleration decreases, and vice versa.

Newton's Second Law of Motion states that an object's acceleration is inversely proportional to its mass and directly proportional to the force acting on it. In other words, it takes more effort to accelerate an item at the same pace as a smaller object the bigger its mass. As a result, the relationship between acceleration and mass is inverse. The mathematical formula a = F/m, where a stands for acceleration, F for force, and m for mass, describes this connection.

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The brass pendulum will lose or gain approximately 0.0015 seconds per day when the temperature of its surroundings rises from 10°C to 35°C

The time period of a pendulum is given by the formula:

T = 2π√(L/g)

where T is the time period, L is the length of the pendulum, and g is the acceleration due to gravity.

Since both pendulums have the same length and are located in the same gravitational field, their time periods are equal. Therefore, the time gained or lost by the brass pendulum due to the change in temperature can be calculated using the following formula:

ΔT = T × α × ΔT

where ΔT is the change in temperature, α is the coefficient of linear expansion of brass, and T is the original time period.

The coefficient of linear expansion of brass is approximately 19 × 10^-6 /°C.

Substituting the values given in the problem, we get:

ΔT = T × α × ΔT

= (2π√(L/g)) × (19 × 10^-6 /°C) × (35 - 10) °C

= 2π√(L/g) × (0.000019) × (25) °C

= 2π√(L/g) × 0.000475

Assuming a standard pendulum length of 1 meter, the time gained or lost by the brass pendulum can be calculated as follows:

ΔT = 2π√(L/g) × 0.000475

= 2π√(1/9.81) × 0.000475

≈ 0.0015 seconds

Therefore, the brass pendulum will lose or gain approximately 0.0015 seconds per day when the temperature of its surroundings rises from 10°C to 35°C.

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A hot air balloon is 100 feet above the ground when a motorcycle (traveling in a straight line on a horizontal road) passes directly beneath it going 45 miles/hour.

Given that, The altitude of the balloon from the ground = 100 feet The velocity of the motorcycle = 45 miles/hour = 66 feet/second Rate of ascending of the balloon = 10 feet/second Now, When the motorcycle passed the balloon, both of them are on the same line passing through the ground.

Let the length of the balloon be L. The time taken for the balloon to move L distance = L / Rate of ascent of balloon L = 0 because it is already in sight. Hence, the motorcycle driver has to travel for no time before the balloon is out of sight.

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Answer:

0.699 L of the fluid will overflow

Explanation:

We know that the change in volume ΔV = V₀β(T₂ - T₁) where V₀ = volume of radiator = 21.1 L, β = coefficient of volume expansion of fluid = 400 × 10⁻⁶/°C

and T₁ = initial temperature of radiator = 12.2°C and T₂ = final temperature of radiator = 95.0°C

Substituting these values into the equation, we have

ΔV = V₀β(T₂ - T₁)

= 21.1 L × 400 × 10⁻⁶/°C × (95.0°C - 12.2°C)

= 21.1 L × 400 × 10⁻⁶/°C × 82.8°C = 698832 × 10⁻⁶ L

= 0.698832 L

≅ 0.699 L = 0.7 L to the nearest tenth litre

So, 0.699 L of the fluid will overflow

Answer:

A, Bohr's model

Explanation:

Took the quiz, hope it's right for you.

(The other three did have something to do with it they just didn't create that specific model)

The model of the atom that has electrons traveling in specific paths around the nucleus is Rutherford's model.

Therefore, the correct answer is option B

J. J Thomson proposed that the atom is a sphere of positively charged matter in which negatively charged electron are embedded.

In Rutherford's model of atomic structure, the electrons moves in orbits by electrostatic attraction to the positively charged nucleus.

According to Dalton's atomic theory, atom were indestructible and indivisible  solid particle.

Bohr's model made assumption that electron can only exist in circular orbits of definite quantum energy.  

According to the question, the model of the atom that has electrons traveling in specific paths around the nucleus is Rutherford's model.

Therefore, the correct answer is option B

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Answer:

The inverse square law proposed by Newton suggests that the force of gravity acting between any two objects is inversely proportional to the square of the separation distance between the object's centers.

Explanation:

If x(n) is passed through an ideal d/a (digital-to-analog) converter, the reconstructed signal ya(t) will be an analog signal that approximates the original discrete-time signal x(n). The d/a converter converts the discrete-time samples into a continuous-time signal.

To reconstruct the signal ya(t), the d/a converter needs to perform the following steps:

1. Sample and Hold: The d/a converter first samples the discrete-time signal x(n) at regular intervals. This means that it takes snapshots of the signal at specific points in time.

2. Quantization: The sampled values are then quantized, which means they are approximated to a limited set of values. The number of bits used for quantization determines the resolution of the reconstructed signal.

3. Digital-to-Analog Conversion: The quantized values are converted into corresponding analog voltage levels. This process involves reconstructing a continuous-time signal that closely resembles the original waveform.

The reconstructed signal ya(t) is a continuous-time approximation of the original signal x(n). It is important to note that the accuracy of the reconstructed signal depends on the sampling rate and the resolution of the d/a converter. A higher sampling rate and resolution generally result in a more accurate reconstruction.

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Explanation:

(24 cm / 4.0 min) × (1 min / 60 s) × (1 m / 100 cm) = 0.001 m/s

The two variables that affect kinetic energy are the mass and velocity of the object.

The kinetic energy (K.E.) of an object can be described as the energy exhibited by a moving body due to its motion. The change in the kinetic energy of an object when work is done.

The kinetic energy can be expressed as follows:

K.E = ½mv²  where ‘m’ & ‘v’ are mass and the velocity of the object respectively.

Kinetic energy can be transferred but potential energy is not transferable. The body maintains kinetic energy unless its speed changes.  In classical mechanics, the kinetic energy of a non-rotating object is given by \({\textstyle {\frac {1}{2}}mv^{2}}\) .

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