order these least to most dense
the core
the mantle
the crust

Answer:

zero

Explanation:

The linear momentum is conserved when the system is closed. Therefore, the net force is zero.

In order to calculate the work done, we can use the formula below:

Where W is the work done (in J), F is the force (in N) and d is the distance (in m).

Since the boy is going up the stairs, the force is equal to his weight force:

Now, calculating the work, we have:

Therefore the correct option is B.

The electrical conductivity of the wire is 10^7 S/m (Siemens per meter).

To calculate the electrical conductivity, we can use the formula:

Electrical conductivity (σ) = 1 / (Resistance × Cross-sectional area / Length)

Given:

Length (L) = 20 cm = 0.2 m (since 1 cm = 0.01 m)

Cross-sectional area (A) = 2 × 10^(-3) cm^2 = 2 × 10^(-7) m^2

Resistance (R) = 0.2 Ω

Substituting these values into the formula, we get:

Electrical conductivity (σ) = 1 / (0.2 Ω × (2 × 10^(-7) m^2) / 0.2 m)

The unit of resistance cancels out, and we are left with:

σ = 1 / (\(2 \times 10^{(-7) }m^2\) / 0.2 m)

Simplifying further:

σ = 1 / (\(10^{(-7)}\) m)

To divide by a number in scientific notation, we can multiply by its reciprocal. Therefore:

σ =\(1 \times 10^7\) m^(-1)

Hence, the electrical conductivity of the wire is 10^7 S/m (Siemens per meter).

Electrical conductivity is a measure of a material's ability to conduct electric current. In this case, the wire's electrical conductivity is relatively high, indicating that it is a good conductor of electricity.

The value of \(10^7\)S/m suggests that the wire can easily carry current due to the presence of free charge carriers (e.g., electrons) that can move through the wire with minimal resistance.

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Answer:

(a) Effect of pressure :

(a) Effect of pressure :(b) Effect of temperature :

(a) Effect of pressure :(b) Effect of temperature :(c) Effect of density :

(a) Effect of pressure :(b) Effect of temperature :(c) Effect of density :(d) Effect of moisture (humidity):

(a) Effect of pressure :(b) Effect of temperature :(c) Effect of density :(d) Effect of moisture (humidity):(e) Effect of wind:

Explanation:

Answer:

Horizontal component = 60.05 m/s

vertical component = 22.96 m/s

Explanation:

cosine(angle) = adjacent / hypotenuse or  horizontal / angled velocity

angled velocity * cosine (angle) = horizontal velocity

65 m/s * cosine(22.5) = 60.05 m/s

sine(angle) = adjacent/ hypotenuse or vertical/ angled velocity

angled velocity * sine (angle) = vertical velocity

65m/s sine(22.5) = 22.96 m/s

The current should the solenoid carry is 0.22A.

We need to know about the magnetic field of solenoids to solve this problem. The magnetic field appears when there is any current flowing through the solenoid. The magnitude of the magnetic field can be determined by

B = μ₀ . I . N / L

where B is the magnetic field, μ₀ is the vacuum permeability (4π x 10¯⁷ H/m), I is current, N is coil turns and L is the length of the solenoid.

From the question above, the parameters given are

L = 52.0 cm = 0.52 m

d = 1.35 cm

R = 0.0135/2 m

B = 0.375 mT = 0.000375 T

N = 705

By substituting the given parameters, we can calculate current

B = μ₀ . I . N / L

0.000375 = 4π x 10¯⁷ . I . 705 / 0.52

I = 0.22 A

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Answer: You can change many things ranging from the size and shape of the paper plane. Cutting slits into the plane allows the air to carry it further.

Rotation curves for spiral galaxies show (C) most have dark halos since It appears that spiral galaxies are encased in the substantial dark matter "halos".

Abstract The main method for ascertaining the mass distribution in spiral galaxies is to analyse the rotation curves of spiral galaxies. They offer vital knowledge for comprehending spiral galaxies' dynamics, evolution, and creation. This substance, which has mass but emits no light, is referred to as "dark matter." The dispersion of dark matter appears to extend much beyond the host galaxy's borders, according to the rotation curves of satellite galaxies.

Rotation curves are used by astronomers to calculate the masses of specific spiral galaxies. There is more mass between the stars and the galactic centre the quicker the stars orbit the galaxy's centre.

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Answer:

Fin Lin = Fo Lo  Work = Work out where in = input and o = output

Fin / Fo = Lo / Lin = 30 / 60 = 1/2   (input force = 1/2 output force)

Lin + Lo = 3

Lo = 3 - Lin

1/2 = (3 - Lin) / Lin    from above

1/2 = 3 / Lin - 1

3 / Lin = 1.5   and Lin = 2

So the input length = 2 m and the output length = 1 m

Using the Newton Laws, the acceleration of the object is 2.67m/s²

Based on the problem, we can draw the diagram as below to help our understanding.

From the information provided we know that:

F = 50 N (horizontal pull)

W = 75 N

f = 30 N (friction force)

From the picture, we could focus first on the X-axis, where the horizontal force and the friction force work on the object. We would apply the second law of Newton for this axis since there is movement happening within this axis.

∑Fx = m.a

F - f = m.a

50 - 30 = m.a

m.a = 20N ... (i)

Next, we will focus on the Y-axis. In this axis neutral force and weight are working but not resulting to any movement within the axis. ence, we will be applying the first law of Newton:

∑F = 0

N - W = 0

N = W

N = 75N ... (ii)

Since we know that weight is the result of multiply between mass and gravity, we could find the mass of the object by assuming the gravity is 10m/s²

W = m.g

75 = m (10)

m = 7.5kg ... (iii)

We could subtitute the equation (iii) into equation (i) to find the acceleration of the object:

m.a = 20N

(7.5) a = 20N

a = 2.67m/s²

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The proportion of energy converted to heat in a machining operation typically ranges between 70-90% of the total energy consumed.

The proportion of energy converted to heat in a machining operation can vary depending on several factors such as the material being machined, cutting tool, and machining parameters. However, it is generally estimated that a significant portion, around 70-90% of the total energy consumed, is converted into heat during the process.

Machining operations involve material removal through cutting, grinding, or drilling. During these processes, a considerable amount of friction is generated between the cutting tool and the workpiece, resulting in heat production. This heat can negatively affect the cutting tool's performance, workpiece dimensional accuracy, and surface finish quality.

The primary sources of heat generation in machining operations are as follows:

1. Primary deformation zone:

Heat is generated due to the plastic deformation of the material being removed from the workpiece. This accounts for approximately 60-80% of the total heat generated.

2. Secondary deformation zone:

Heat is produced due to friction between the newly formed chip and the rake face of the cutting tool. This accounts for around 10-30% of the total heat generated.

3. Tool-chip interface:

The friction between the cutting tool and the chip contributes to additional heat generation, which is approximately 5-10% of the total heat produced.

To minimize heat generation and its adverse effects on machining operations, various techniques can be employed, such as optimizing cutting parameters, using proper cutting fluids, and selecting suitable tool materials and coatings.

This heat is primarily generated in the primary and secondary deformation zones, as well as at the tool-chip interface, and can negatively impact the machining process's performance and product quality.

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1. An example of a flow driven by a horizontal pressure gradient that isn't caused by buoyancy differences is the wind.

2. An example of a large-scale flow in the ocean that is density-driven is the thermohaline circulation, also known as the global conveyor belt.

3. Density-driven or baroclinic flows refer to smaller-scale flows that arise from density differences within a fluid.

1. An example of a flow driven by a horizontal pressure gradient that isn't caused by buoyancy differences is the wind. Wind is the movement of air driven by differences in atmospheric pressure. The horizontal pressure gradient force acts to balance pressure differences, causing air to flow from areas of higher pressure to areas of lower pressure. This movement is not directly related to buoyancy differences but rather the pressure variations in the atmosphere.

2. An example of a large-scale flow in the ocean that is density-driven is the thermohaline circulation, also known as the global conveyor belt. This circulation is driven by differences in water density due to temperature and salinity variations. Cold, dense water sinks in certain regions (such as the North Atlantic), initiating a slow, deep current that transports water masses across vast distances and depths. This circulation plays a crucial role in global heat distribution and nutrient transport.

3. The difference between the density-driven flow in the ocean (such as thermohaline circulation) and a density-driven or baroclinic flow lies in their scales and driving mechanisms. Density-driven flows like thermohaline circulation operate on large scales and are driven by differences in water density due to temperature and salinity variations. These flows involve slow, deep currents that transport water masses over long distances and depths.

On the other hand, density-driven or baroclinic flows refer to smaller-scale flows that arise from density differences within a fluid. These flows typically occur in regions where there are gradients in density, temperature, or salinity. They often involve vertical motions and can be found in various oceanic and atmospheric phenomena, such as coastal upwelling, frontal systems, and eddies. Unlike the large-scale thermohaline circulation, these flows are more localized and occur in specific regions where density gradients exist.

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It is true that motion can be described as using position and time.

Motion is defined as a change in the position of an object with respect to time. It involves measuring the distance and direction of an object's movement from its starting point to its endpoint. Position and time are essential factors that help describe motion. Position refers to the location of the object while time refers to the duration it takes to move from one point to another. For example, if a car starts at point A and moves to point B, the motion of the car can be described by measuring the distance between the two points and the time it took to travel that distance. Therefore, motion can be accurately described by using position and time as key parameters.

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Answer:

petroleum and Natural gas are fossil fuels

Explanation:

The wavelength of the GPS satellite signal with a frequency of 1575 megahertz is 0.1905 meters.

The wavelength of the GPS satellite signal with a frequency of 1575 megahertz (1.575 x 10^9 Hz) can be calculated using the formula: wavelength = speed of light / frequency.

The speed of light in a vacuum is approximately 3 x 10^8 meters per second. To calculate the wavelength, we divide the speed of light by the frequency:

wavelength = (3 x 10^8 m/s) / (1.575 x 10^9 Hz) = 0.1905 meters

Therefore, 0.1905 is the wavelength of the GPS satellite signal with a frequency of 1575 megahertz.

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The magnitude of the acceleration of the ball  applied at the bottom of the circle is expressed as FTension-FGravity/M.

You can write it down as FC = mv2 /r.

The centripetal force in a moving object attached to a string is equal to the product of the object's mass (mg) and the string tension (T).

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The displacement x for times from 0 to 10 seconds when the maximum displacement \(0.628m/s.\)

Given that the amplitude \((A)\)is 0.2 m and the time period \((T)\)is 2 s, we can calculate the maximum velocity \((V)max\) using the formula \(vmax=wA\) where \(W\) is the angular frequency.

The angular frequency \(w\)  is defined as \(2\pi /T\)  Substituting the given values:

\(w=2\pi /t=2\pi /2=\pi =rad/s\)

Now, we can calculate the maximum velocity:

\(vmax = wA =\pi *0.2m/s=0.2\pi m/s\)

Therefore, the maximum velocity is \(0.628m/s.\)

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The question is incomplete complete question is given below

Find the displacement x for times from 0 to 10 seconds when the maximum displacement

Answer:

The force is pull or push acting on the body which tends to change its state of rest or of motion is called force.

There are two types of force:

1.Contact force

2. Non-Contact

Electromagnetic radiation which is visible to the human eye is only visible light and not all electromagnetic radiation. Best choices provided  is F (false).

Electromagnetic radiation are the wave which is form of energy and includes the waves such as radio waves, gamma waves, visible light waves etc.

Types of electromagnetic radiation-

Thus the electromagnetic radiation which is visible to the human eye is only visible light and not all the electromagnetic radiation. Best answer from the choices provided F (false).

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Answer:

False

Explanation:

Have the day you deserve :)

When a dielectric material is introduced between the plates of a capacitor D) the capacitance increases and the potential difference decreases.

When a dielectric material is introduced between the plates of a capacitor, it increases the capacitance of the capacitor. This is because the dielectric material reduces the electric field between the plates, allowing more charge to be stored on the plates for a given potential difference.

However, the charge on the capacitor remains constant because the battery has been disconnected.Since the charge remains constant and the capacitance increases, the potential difference across the plates must decrease according to the equation V=Q/C. Therefore, option (D) is the correct answer.

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The component of white light that will be refracted the most when passing from air into an aquarium filled with salt water is violet light.

When light passes from one medium to another, it undergoes refraction, which is the bending of light as it changes speed. The degree of refraction depends on the refractive index of the medium. The refractive index is a measure of how much a medium can slow down light compared to a vacuum or air.

In general, the refractive index of a medium increases as the frequency of light increases. The different colors of light correspond to different frequencies, with violet light having the highest frequency among the visible colors.

The refractive index of salt water is higher than that of air. Therefore, when white light enters the aquarium filled with salt water, each color component will experience a different degree of refraction. Violet light, being the color with the highest frequency, will experience the greatest change in direction.

In summary, when white light passes from air into an aquarium filled with salt water, the violet component of the light will be refracted the most. This is because the refractive index of salt water is higher than that of air, and the refractive index increases with the frequency of light.

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A specific number of frames per minute are processed by the projector when a motion picture on film is shown.

Motion is indeed the open borders of a body in relation to time. For instance, the fan, the carpet's dust blowing off of it, the water running from the taps, a ball rolling about, a moving car, etc. Even for the universe is always changing.

Movement, the act of process of changing or shifting locations or positions. ability to move with the force of a physical human. gait is the term for the way a person walks. a gesture; a movement or shift in posture.

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Answer:

Explanation:

\(m =800kg\\v = 15\\\\K.E = \frac{1}{2}mv^2\\ K.E= \frac{1}{2} \times 800\times 15^2\\= 400 \times 225\\= 90000 joules\\= 90 kilojoules\)

Hi there!

Assuming the rod is pulled back 90° (π/2 radians), we can use angular kinematics to solve.

Using the equation:

\(\omega_f^2= \omega_i^2 + 2\alpha \theta\)

\(\omega_f\) = final angular velocity (? rad/sec)

\(\omega_i\) = initial angular velocity (0 rad/sec)

\(\alpha\) = angular acceleration (rad/sec², must solve for)

\(\theta\) = angular displacement (π/2 rad)

Recall Newton Second Law's rotational equivalent:
\(\Sigma \tau = I\alpha\)

τ = Torque (Nm)

I = Moment of inertia (kgm²)
α = angular acceleration (rad/sec²)

Setting the pivot point at the end, and knowing that the force of gravity works at an object's center of mass (1.5m from the rod's end), we can solve for the angular acceleration.

\(\tau= F \times r\\\\\tau = W \times r = 10(9.8) * 1.5 = 147 Nm\)

Now, solve for the moment of inertia given I = 1/3ML² at one of its ends:
\(I = \frac{1}{3}(10)(3^2) = 30 kgm^2\)

Solve for the angular acceleration:
\(147 = 30\alpha\\\\\alpha = 4.9 \frac{rad}{sec^2}\)

Now, we can use the kinematic equation to solve.

\(\omega_f^2 = 0 + 2(4.9)(\frac{\pi}{2}})\\\\\omega_f = \sqrt{2(4.9)(\frac{\pi}{2})} = \boxed{3.923 \frac{rad}{sec}}\)

The horizontal speed of the kid will be 3.2 meter/sec.

There are two components of velocity , one is horizontal and another is vertical. so with respect to y direction. we generate 2 components when we assume that the event is happening in 2D plane. If the event is happening in 3D plane then we may derive three components of a vector. Velocity is a vector quantity.

initial velocity ( \(v_{y0}\)) = 0

Δy = 3 meter

As we know that

Δy = \(v_{y0}t + \frac{1}{2} a t^{2}\)

putting the values we can calculate

t = 0.78 sec

now for horizontal speed,

Vx = ΔX/t

Vx = 2.5/0.78

Vx = 3.2 m/s

So the horizontal speed is 3.2 m/s .

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Answer:

a counterclaim

Explanation:

authors purpose is what an author wrote somthing for

opinion is someones thoughts or "side" on a argument

an arguement is a battle of opinions if that makes sense

The force exerted by the fire hose is 2.827 kN

First, we need to calculate the area of the jet using the formula for the area of a circle:

Area = π x (radius)^2

We know the diameter of the jet is 0.6m, so the radius is half of that

radius = 0.6m / 2 = 0.3m

Plugging this value into the formula, we get:

Area = π x (0.3m)^2 = 0.2827 m^2

Next, we can use the formula for pressure to calculate the force exerted:

Pressure = Force / Area

Rearranging this formula to solve for force, we get:

Force = Pressure x Area

Plugging in the given values, we get:

Force = 10 kPa x 0.2827 m^2 = 2.827 kN

Therefore, the force exerted by the fire hose is 2.827 kN (kilonewtons).

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A wooden block contains some nails so that its density is exactly equal to that of water. if it is placed in a tank of water and released from rest when it is completely submerged, it will remain where it is released.

The concept of density seeks to measure the weight of an object in relation to its size. It is the measure of how packed together the particles of that object are. An object placed in a liquid displaces a certain volume of the liquid, based on the relative density of the object and the liquid.

If an object is less dense than a liquid in which it is placed, it displaces a smaller volume of the liquid than its volume, hence only some part of the object will be seen to be under the liquid, the other part will float.

If an object is denser than the liquid in which it is placed, it displaces a larger volume of the liquid than its own volume, making the object to sink and is submerged, sometimes to the bottom of the liquid, but mostly below the point at which it was released.

Finally, if the density of an object and the liquid into which it is submerged is the same. the object's mass per unit volume is the same as the liquid's mass per unit volume, hence the weight and force created due to density will balance and cancel each other out hence making the object to remain where it was submerged.

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