A bar of gold has a temperature of 22°C, and a bar of aluminum has a
temperature of 27°C. Which statement explains why the bar of aluminum ha
a higher temperature?
A. The particles that make up the aluminum bar are moving more
slowly.
B. The particles that make up the aluminum bar are moving faster.
C. The aluminum bar has a lower density than that of the gold bar.
O D. The aluminum bar has less thermal energy.

Answer:The four main branches of physical science are astronomy, physics, chemistry, and the Earth sciences, which include meteorology and geology.

Answer:

Chemistry, physics, astronomy and earth science.

Explanation:

The four main categories of physical sciences are chemistry, physics and earth science and astronomy. Life sciences deal with living organisms and behavioral sciences deals with the interactions between organisms in the natural world.

According to the research, scientific methods are said to involve critical thinking since it seeks to establish the explanation of a phenomenon based on what is previously known, analyzing and evaluating the information.

It is the ability to collect that consists of analyzing and evaluating the consistency of existing information regarding a given topic or issue, trying to clarify the veracity of said information and reach a justified idea in this regard, ignoring possible external biases.

Scientific methods are based on concrete and verifiable facts, and not on beliefs or opinions, being the responsibility of the scientist or researcher to maintain their critical thinking in the research, that is, the constant questioning of information and conclusions.

Therefore, we can conclude that according to the research, scientific methods are said to involve critical thinking since it seeks to establish the explanation of a phenomenon based on what is previously known, analyzing and evaluating the information.

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Answer:

d. N*m

Explanation:

Workdone which is measured in Joules is calculated using the formula;

Workdone = force * distance

Where;

Force is measured in Newton

Distance is measured in meters.

Therefore, workdone also has the measurement of Newton-meters.

Answer:

En esta respuesta voy a usar la unidad μm, tal que:

1 μm = 1*10^(-9) m

Objetos que pueden ser observados a simple vista:

Son todos aquellos objetos que podemos observar simplemente con nuestros ojos, con ellos podemos observar desde un edificio (con tamaños de decenas de metros) hasta algunos cabellos, que pueden tener un diámetro de 0.1 mm

Cosas más pequeñas que estás muy difícilmente se pueden ver a simple vista.

Con un microscopio podremos ver cosas del tamaño de una célula, como glóbulos blancos, rojos, algunos microorganismos, etc, los cuales rondan un tamaño de unos 10 μm. Naturalmente, distintos microscopios tendrán distintas amplificaciones (por lo que con algunos podremos ver objetos muy pequeños que con otros no).

Microscopio eléctrico:

Este microscopio usa electrones en lugar de luz para formar imágenes.

Con él podremos observar cosas como las componentes de una célula (membranas, orgánulos grandes, etc), los cuales pueden medir unos pocos nanómetros (por ejemplo, una membrana celular tendrá un tamaño de entre 5 μm y 10 μm)

Microscopio de transmisión.

Tener en cuenta que el microscopio de transmisión es un microscopio eléctrico, el cual lanza un haz de electrones al objeto que se desea observar, de tal forma que algunos de estos electrones rebotan formando así la imagen virtual amplificada que podemos observar.

Con estos aparatos podemos ver orgánulos pequeños (0.5 μm), y lo más pequeño que podemos ver (con los microscopios más potentes) son columnas de átomos (0.1 μm)

Scientists believe that light is made of streams of particles, called photons, because of their observed behavior. In certain experiments, such as the photoelectric effect, it was found that light behaves more like a particle than a wave. For example, light can knock electrons out of atoms, which would require a particle-like behavior. Additionally, the energy of each photon is directly proportional to its frequency, which is a characteristic of particles. The behavior of light in other experiments, such as the double-slit experiment, can also be explained by the wave-like behavior of photons. Therefore, scientists have concluded that light has both particle and wave-like properties, known as wave-particle duality.

While this answer may provide helpful information for your assignment, it is important to remember that using it verbatim could be seen as plagiarism. To avoid this, it is best to use your own words and properly cite any sources used. This will ensure that you are giving credit to the original author and presenting your own unique perspective on the topic.

~~~Harsha~~~

According to the question, the sofa and carpet have a static friction coefficient of 10.519.

Static friction is defined as a force that maintains an object at rest. when someone tries to move a stationary thing across a platform without actually moving their body or the platform they were moving the object across, they face resistance.

Given:

Wight of sofa = 117 kg

Force= 109N

weight = mass × acceleration due to gravity 117 × 9.8 = 1146.6

the mass is given in kilograms, but work in newtons, thus we multiplied the mass by 9.8

acceleration = Zero

force = resistance

substitute force with 109N and resistance with 1146.6× μ

109 = 1146.6 × μ

μ = 1146.6/109

μ = 10.519

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Explanation:

Option C a magnet attracting a nail

Answer:

2) 6.22 × 10^-13

3) 4.56 × 10^-4

Explanation:

Answer:

B. i think. hope its right

Explanation:

Alright, alright, fam, let's dive into this problem. I'll describe how a Free Body Diagram (FBD) would look for this situation.

a) So picture it, yeah? You got your crate, right? This crate is on the ramp. The forces on the crate are:

1. **Gravitational force (Fg)**: this is the weight of the crate pulling it down towards the Earth. It equals mass times gravity, or 53 kg * 9.8 m/s^2.

2. **Normal force (Fn)**: This one's the force that the ramp is exerting back up on the crate. It's perpendicular to the surface of the ramp, not straight up.

3. **Frictional force (Ff)**: This is the force that's trying to slide your crate back down the ramp. It's always against the direction of movement, so it's downwards along the ramp.

4. **Applied force (Fa)**: This is you pushing the crate up the ramp, fam! This force is 373N, upwards along the ramp.

b) Now, let's slide into the math, okay? When you're pushing the crate up the ramp at a constant velocity, the total force acting on it is zero (it's called equilibrium, yo). This means the sum of all the forces we talked about is equal to zero.

Here's the breakdown:

1. The force you apply up the ramp (Fa) and the force of friction (Ff) that opposes the motion are balanced. So, Fa = Ff. You know Fa, it's 373N.

2. The force of gravity pulling down (Fg) gets split into two components. One part is acting down the ramp, directly opposing your applied force. The other part is acting into the ramp, which is balanced by the normal force. The part of the gravity that is acting down the ramp is Fg * sin(22 degrees).

3. At equilibrium, the force you're applying (Fa) is equal to the frictional force (Ff) plus the component of the gravitational force acting down the ramp. So, Fa = Ff + Fg * sin(22 degrees). Since you know Fa and Fg, you can calculate Ff.

4. The frictional force (Ff) is also equal to the coefficient of friction (mu) times the normal force (Fn). So, Ff = mu * Fn. You can calculate Fn from the component of gravity that's acting into the ramp, which is Fg * cos(22 degrees).

5. From the above two equations, you can find mu (coefficient of friction) as mu = Ff / Fn.

Let's calculate:

The component of gravity along the ramp is Fg_along = 53kg * 9.8 m/s^2 * sin(22 degrees) ≈ 206.7N.

The component of gravity into the ramp is Fg_into = 53kg * 9.8 m/s^2 * cos(22 degrees) ≈ 499.4N.

The force of friction (Ff) is Fa - Fg_along = 373N - 206.7N = 166.3N.

And finally, the coefficient of friction (mu) is Ff / Fn = 166.3N / 499.4N ≈ 0.33.

So there you have it, the coefficient of friction between the crate and the ramp is approximately 0.33. Keep in mind these are all approximations since we rounded off the values a little bit. Hope that's clear

Answer:

B

b

b

b

b

b

b

b

b

b

b

b

b

b

b

bb

b

b

b

b

b

b

b

b

b

b

b

b

b

b

Answer:

B is the answer

Explanation:

i marked b on my test and got 100%

Option(D) is correct. (D) Stored heat and as such cannot be directly measured with a thermometer.

Latent heat refers to the heat energy absorbed or released during a phase change of a substance, such as the conversion of water from a solid (ice) to a liquid (water) or from a liquid to a gas (water vapor). It is a form of stored heat that cannot be directly measured with a thermometer because it is associated with the change in the internal energy of the substance rather than its temperature.

The latent heat associated with melting a solid or freezing a liquid is called the heat of fusion; that associated with vaporizing a liquid or a solid or condensing a vapour is called the heat of vaporization. The latent heat is normally expressed as the amount of heat (in units of joules or calories) per mole or unit mass of the substance undergoing a change of state.

For example, when a pot of water is kept boiling, the temperature remains at 100 °C (212 °F) until the last drop evaporates, because all the heat being added to the liquid is absorbed as latent heat of vaporization and carried away by the escaping vapor molecules. Similarly, while ice melts, it remains at 0 °C (32 °F), and the liquid water that is formed with the latent heat of fusion is also at 0 °C. The heat of fusion for water at 0 °C is approximately 334 joules (79.7 calories) per gram, and the heat of vaporization at 100 °C is about 2,230 joules (533 calories) per gram. Because the heat of vaporization is so large, steam carries a great deal of thermal energy that is released when it condenses, making water an excellent working fluid for heat engines.

Therefore option(D) is correct .  Stored heat and as such cannot be directly measured with a thermometer.

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Assuming a regulation distance of 60 feet 6 inches from the pitcher's mound to home plate, a 90 mph fastball would take approximately 0.43 seconds to reach home plate.

To calculate the time it takes for a 90 mph fastball to reach home plate, we can use the formula:
time = distance / speed
First, we need to convert the speed from miles per hour (mph) to feet per second since the distance to home plate is typically measured in feet. There are 5280 feet in a mile, and 3600 seconds in an hour. So, we can convert the speed like this:
90 mph * (5280 feet / 1 mile) * (1 hour / 3600 seconds) = 132 feet per second
The distance from the pitcher's mound to home plate in a standard baseball field is approximately 60.5 feet. Now, we can plug this distance into our formula:
time = 60.5 feet / 132 feet per second ≈ 0.458 seconds
So, it takes approximately 0.458 seconds for a 90 mph fastball to reach home plate.

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The gain in translational kinetic energy of the cylinder when it has rolled 5m down the incline of the plane is approximately 345.6 J.

Given data:

Diameter, d = 0.20 mRadius,

r = 0.10 mMass of cylinder,

m = 12 kgInclined angle, θ = 37°

Distance traveled by cylinder, s = 5m

We know that work done by the gravitational force is the change in potential energy.

W=Fhsinθ... (1)

The kinetic energy of rolling objects is equal to its rotational kinetic energy plus its translational kinetic energy.

K = 1/2Iω² + 1/2mv²... (2)

The moment of inertia of a solid cylinder I=mr²/2.

Using conservation of energy principle:

Gain in translational kinetic energy of the cylinder is equal to the loss in potential energy.

Thus,

½mv²=mgH-mgSins....(3)

When the cylinder rolls without slipping, its velocity is equal to its angular velocity multiplied by its radius

v=ωr

Therefore, the rotational kinetic energy can be expressed as

1/2Iω²=1/2mr²ω²/2.... (4)

Using equations (1), (2), (3), and (4),

we can find the gain in translational kinetic energy of the cylinder while it rolls 5m down the incline of the plane.

K=1/2mv²=1/2m(v=ωr)²=1/2mr²ω²/2=1/2Iω²=1/2(12)(0.10)²(2/2)=0.12J... (5)

Potential energy, P=mgh=mgSins=12(9.8)(5)sin37°=294.2 J... (6)

So, using equations (5) and (6), we can get the gain in translational kinetic energy of the cylinder to be approximately:

K = 294.2 J – 0.12 J = 294.08 J

Therefore, the gain in translational kinetic energy of the cylinder when it has rolled 5 m down the incline of the plane is approximately 345.6 J.

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Answer:

true

Explanation:

Answer:

false

Explanation:

The speed of rotation for the torus-shaped space station is approximately 1.62 revolutions per minute (RPM). The period of rotation is about 37.04 seconds, and the frequency is approximately 0.027 Hz.

These values allow astronauts to experience half of their normal weight on Earth. To determine the speed of rotation, we need to find the angular velocity, which is given by ω = v/r, where v is the linear velocity and r is the radius. As the astronauts feel half of their normal weight, the centripetal force is equal to half the gravitational force. Setting this up, we have (mv²)/r = (1/2)mg, where m is the mass of the astronaut and g is the acceleration due to gravity. Solving for v, we find v = √((g*r)/2). The speed of rotation is then v/(2πr) in meters per second, which gives approximately 1.62 RPM. The period T is the inverse of the frequency f, so T = 1/f, where f is given by the formula f = v/(2πr). Substituting the values, we find T ≈ 37.04 seconds, and the frequency f ≈ 0.027 Hz.

The speed of rotation for the torus-shaped space station is approximately 1.62 revolutions per minute (RPM). The period of rotation is about 37.04 seconds, and the frequency is approximately 0.027 Hz.

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When, the volume of water will be displaced by a floating 20-ton boat is the volume of 20 tons of water. Option B is correct.

When a boat floats in water, it displaces a certain volume of water that is equal to its own weight. This is known as Archimedes' principle. Therefore, the volume of water displaced by a floating 20-ton boat is equal to the volume of 20 tons of water.

It is important to note that the shape of the boat's hull does affect how much water is displaced, but the displacement will always be equal to the weight of the boat. So while option (D) is partially correct, it is not the best explanation. Option (A) is incorrect because the volume of water displaced is not necessarily equal to the volume of the boat, and option (C) is incorrect because the volume of the boat is not directly related to the amount of water displaced.

Hence, B. is the correct option.

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Answer:

The shape of a screw is a cylindric shape that grows in diameter at the top. Along the cylindar portion, it has horizantal ridges that circulate around the screw.

Hope this helps, brainliest pls :D

In order of increasing frequency, the regions of the electromagnetic spectrum are as follows: infrared, microwave, visible, and gamma.

Starting with infrared, it has lower frequencies than the other regions mentioned. It lies just below the visible spectrum and is associated with heat radiation. Microwaves have slightly higher frequencies and are commonly used in communication and cooking applications.

Next, the visible spectrum encompasses the range of frequencies that our eyes can perceive. It includes the colors of the rainbow, from red (lower frequency) to violet (higher frequency). The visible spectrum plays a vital role in our perception of the surrounding world.

Finally, gamma rays have the highest frequencies in the list. They are associated with extremely energetic phenomena, such as nuclear reactions and high-energy particle interactions. Gamma rays have wavelengths shorter than X-rays and possess immense penetrating power.

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Answer:

open space is important because it allows the team to determine the position of the body in relation to the court, ball, and net

Explanation:

:D hope this helps

Answer:

Explanation:

The force acting on an object given it's mass and acceleration can be found by using the formula

force = mass × acceleration

From the question we have

force = 4.6 × 9.2

We have the final answer as

Hope this helps you

The net force on the rope will be equal to 1.6 N.

The net force can be defined as the vector sum of forces acting on a body. The net force can be described as a single force providing same the effect as the original forces on the body's motion.

The net force acting on an object becomes the resultant force. The net force has the same effect on the motion as all actual forces taken together by the object.

Given, the applied force by Mrs. Cadillac's class = 50.4 N

The applied force by Mrs. Barr's class = 48.8 N

The net force = 50.4 N + (-48.8N) = 1.6 N

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The critical speed below which the rope would become slack when the bucket reaches the highest point in the circle is determined by the length of the rope and the radius of the circle.

When the bucket is at the highest point in the circle, it is momentarily at rest and the tension in the rope must be zero.

The formula for calculating the critical speed at which the rope becomes slack is:

v = √(gr)

where v is the critical speed, g is the acceleration due to gravity, and r is the radius of the circle.

For example, if the radius of the circle is 2 meters and the acceleration due to gravity is 9.8 m/s², the critical speed would be:

v = √(9.8 × 2) = 4.4 m/s

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With a vacuum wavelength of 488 nm and an electron mass of 9.11*10^-31 kg, an electron travelling at 1490.45 m/s has the same momentum as a photon.

The pace at which the distance a moving item travels changes is measured as speed. Since speed is a scalar, it has magnitude but no direction as a unit of measurement. Speed is the rate at which anything moves over a predetermined distance. The elementary electric charge of the electron, sometimes known as the symbol e or, is a negative one. Given that they have no known components and are part of the first generation of lepton particles, electrons are frequently regarded as being elementary particles to its wavelength.

E = mc^2

mc^2 = hc/(lamda)

v = h/m(lamda)

v = 6.626*10^-34/9.11*10^-31*488*10^-9

v = 1490.45 m/s

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We measure an object's internal kinetic energy by observing its motion and calculating the kinetic energy ,whereas the thermal energy transferred from one object to another is transferred from one object to another is measured through the process of heat transfer

We measure an object's internal kinetic energy by observing its motion and calculating the kinetic energy using the formula\(1/2 mv^2\), where m is the mass of the object and v is its velocity. Internal kinetic energy refers to the energy associated with the movement of particles within the object itself. This energy is related to the object's temperature and the average kinetic energy of its constituent particles.

On the other hand, thermal energy transferred from one object to another is measured through the process of heat transfer. Heat transfer occurs when there is a temperature difference between objects, causing energy to flow from the object with higher temperature to the object with lower temperature. The amount of thermal energy transferred is typically measured using instruments such as thermometers or calorimeters.

There are different methods of heat transfer: conduction, convection, and radiation. In conduction, heat is transferred through direct contact between objects or through a conductive medium. In convection, heat is transferred through the movement of fluids, such as air or water. Radiation involves the transfer of thermal energy through electromagnetic waves, such as heat radiated from the sun.

It is important to note that internal kinetic energy and thermal energy are related but distinct concepts. Internal kinetic energy refers to the energy associated with the motion of particles within an object, while thermal energy refers to the overall energy associated with the temperature of an object or the transfer of heat. Both quantities are important in understanding the behavior and properties of objects and systems.

In summary, we measure an object's internal kinetic energy by observing its motion and calculating the kinetic energy using appropriate formulas. Thermal energy transferred from one object to another is measured through the process of heat transfer, which can be quantified using various instruments and methods depending on the specific situation.

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Answer:

A football flying through the air

Explanation:

when an object has projectile motion it is moving through the air

From the given options, the football flying through the air is the prime example of projectile motion. (option d)

Projectile motion refers to the motion of an object that is launched into the air and moves under the influence of gravity alone. It follows a curved path known as a projectile trajectory. Among the options provided, the example that best represents projectile motion is a football flying through the air.

When a football is kicked or thrown, it experiences an initial force that propels it forward. However, as soon as it leaves the kicker's or thrower's hand or foot, the only force acting on it is gravity. Gravity pulls the football downward, causing it to follow a curved path. The shape of the path depends on the angle at which the football is launched and its initial velocity.

During its flight, the football follows a parabolic trajectory, moving both horizontally and vertically. The horizontal component of its motion remains constant, while the vertical component experiences a downward acceleration due to gravity. This combination of horizontal and vertical motion creates the characteristic curved path of projectile motion.

Therefore, option (d) is correct.

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(a) The corresponding velocity potential is -4y x -2x + f(t). (b) Bernoulli equation can be applied if the flow satisfies certain conditions: steady, inviscid, and incompressible.

Q6: The estimated speed of sound in the pipe is 368.9 m/s.

a) The velocity potential (\(\phi\)) can be obtained by taking the negative partial derivatives of the stream function (Y) with respect to x and y. In this case, the stream function \(Y = 2y^2 - 2x + 5\). Taking the partial derivatives:

\(\partial \phi /\partial x = -\partial Y/\partial y = -4y\\\partial\phi /\partial y = \partial Y/\partial x = -2\)

Thus, the corresponding velocity potential is \(\phi = -4y x -2x + f(t)\), where f(t) is an arbitrary function of time.

b) The Bernoulli equation relates the pressure, velocity, and elevation along a streamline in a fluid flow. It can be applied if the flow satisfies certain conditions: steady, inviscid, and incompressible. The given flow field does not provide information about the velocity or elevation, so cannot determine if the flow satisfies these conditions. Therefore, cannot conclusively state whether the Bernoulli equation can be applied to this flow without additional information.

Q6) For calculating the speed of sound, use the adiabatic equation:

\(v = (y * R * T)^{0.5}\)

Where v is the speed of sound, y is the heat capacity ratio (1.4 for carbon dioxide), R is the gas constant (188 m/(s.K) for carbon dioxide), and T is the temperature in Kelvin.

First, convert the temperature from Celsius to Kelvin:

\(T(K) = T(^0C) + 273.15\)

T(K) = 300 + 273.15 = 573.15 K

Next, substitute the given values into the equation:

\(v = (1.4 * 188 * 573.15)^{0.5}\)

v ≈ 368.9 m/s

Therefore, the estimated speed of sound in the pipe is approximately 368.9 m/s.

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Explanation:

With a graph, you can actually see what all the numbers in a data table mean.

Answer:

In the visible spectrum of light, the color of the light depends on the frequency. The visible spectrum is always the same for a rainbow or the separated light from a prism. The order of colors is red, orange, yellow, green, blue, indigo, and violet.

Explanation: