which of the components of the universe best describes a system of stars, gases, and dust held together by gravity? * 2 points a. galaxy b. planet c. comet d. solar system

Answer:

Procedure - Take 150g of ice in a beaker and suspend a laboratory thermometer so that the bulb is in contact with ice. Start heating and note the temperature when the ice starts melting. Finally, note the temperature when all the ice is completely melted.

Change in heat causes change in temperature because heat is the transfer of energy from a hotter object to a cooler object, leading to a change in the internal energy of the substance, which in turn affects its temperature.

When heat is added to a substance, its internal energy increases, and the particles in the substance gain kinetic energy, leading to an increase in temperature. The kinetic energy of the particles determines their motion, and as they move faster, the temperature of the substance rises.

Conversely, when heat is removed from a substance, its internal energy decreases, and the particles lose kinetic energy, resulting in a decrease in temperature. As the particles slow down, the temperature of the substance decreases.

The relationship between heat and temperature is described by the specific heat capacity of the substance, which quantifies the amount of heat required to raise the temperature of a given mass of the substance by one degree Celsius. In simple terms, heat is the energy transferred during a temperature change, and the two are intrinsically linked.

In summary, change in heat causes change in temperature because heat is the energy transferred that alters the internal energy of a substance, leading to changes in the kinetic energy and motion of its particles, resulting in temperature fluctuations.

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Answer:

Explanation:

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Atoms can be cut. This is a true statement about atoms. Hence, option (B) is correct.

The smallest unit of matter that may be divided without producing electrically charged particles is the atom. It is also the smallest piece of substance with chemical element-like characteristics. As a result, the atom serves as the fundamental unit of chemistry.

Space makes up the majority of an atom. The rest is made up of a cloud of negatively charged electrons surrounding a positively charged nucleus made up of protons and neutrons. Compared to electrons, which are the lightest charged particles in nature, the nucleus is small and dense.

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Answer:

the answer is A

Explanation:

pH is a measure of how acidic/basic water

Answer:

The model using two cars is very simple. It will also involve the use of a recording machine.

Whilst the sound is being recorded, one model will involve the two cars traveling at approximately the same speed in the same direction with Car A blaring its horn.

They have to repeat the same experiment but this time, the two cars traveling apart from each other at approximately the same speed

The third will entail Car A being stationary and blaring the horn whilst Car B travels towards it all the while recording.

The recorder will be able to demonstrate the Doppler effect does NOT occur.

Explanation:

Doppler Effect refers to the apparent change in sound waves as an observer moves closer or farther from its source.

For example, the definition states that it is apparent which means that the source of the sound does not change the frequency of the sound waves. The sound waves appear to have a higher pitch the closer the source of the sound is to the observer and a lower pitch the farther away the source of the sound is to the observer.

Cheers

Answer:

mustt have same speed

Explanation:

Work is the product of force multiplied by the distance moved, but since the distance moved in the vertical direction is zero

Work Done = 0 joules

Given data

Force = 125N

Horizontal Distance = 2 m

Vertical distance = 0 m

Work = Force * Distance

Solution

substitute the given information

Work Done in the horizontal direction= 125*2

Work Done = 250 Joules

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Answer:

A

Explanation:

The particles of the medium don't travel along with the wave.  and I also just did this question

The era of nuclei ended when the universe was about 380,000 years old due to several factors. One major factor was that neutrinos and electrons were finally able to escape the plasma of the early universe and no longer heated the other particles.

This allowed the universe to cool down and particles to combine to form nuclei. Additionally, photons were finally able to escape the plasma of the early universe and no longer heated the hydrogen and helium ions. As a result, all the free particles had combined to form the nuclei of atoms. Furthermore, the universe had expanded and cooled to a temperature of about 3,000 k, cool enough for stable, neutral atoms to form. Despite these explanations, there is currently no theory that can fully explain why the era of nuclei ended at that specific time.

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The equation for energy in the context of fluid dynamics, specifically in Computational Fluid Dynamics (CFD), is typically represented by the conservation of energy equation, also known as the energy equation or the first law of thermodynamics. The equation can be expressed as:

ρ * (du/dt + u * ∇u) = -∇p + ∇⋅(μ * (∇u + (∇u)^T)) + ρ * g + Q

where:

ρ is the density of the fluid

u is the velocity vector

t is time

∇u represents the gradient of velocity

p is the pressure

μ is the dynamic viscosity

g is the gravitational acceleration vector

Q represents any external heat source/sink

The physical meaning of energy in CFD is the total energy of the fluid system, which includes kinetic energy (associated with the motion of the fluid), potential energy (associated with the elevation of the fluid due to gravity), and internal energy (associated with the fluid's temperature and pressure). The energy equation describes how this total energy is conserved and transformed within the fluid system.

In CFD simulations, the energy equation plays a crucial role in modeling the energy transfer, heat transfer, and flow characteristics within the fluid. It helps in understanding how energy is distributed, dissipated, and exchanged within the fluid domain. By solving the energy equation numerically, CFD simulations can predict temperature profiles, flow patterns, heat transfer rates, and other important parameters that are essential for various engineering applications, such as designing efficient cooling systems, optimizing combustion processes, and analyzing thermal behavior in fluid flows.

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Answer:

thermal energy

Explanation:

The guitar player should shorten the string to a length of 1.036 m to create a 491 Hz note.

The guitar is a popular stringed instrument with a long neck, frets, and a flat soundboard. It has six strings which are typically made of nylon or steel. The strings are tuned to specific notes and plucked with the fingers or a pick. The guitar is used in many genres of music, from classical and jazz to rock and metal. It is also a great instrument for solo performances, as well as for accompanying singers. The guitar is a versatile instrument that can be used to create a range of sounds, from soft and mellow to loud and powerful.

The length of the string needed to create a note of 491 Hz is determined by the formula:

length = velocity/frequency.

Therefore, the length of the string needed to create a 491 Hz note is:

length = 509 m/s/491 Hz = 1.036 m.

Therefore, the guitar player should shorten the string to a length of 1.036 m to create a 491 Hz note.

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Thomas Young did experiments with light, known as the double-slit experiments, to produce interference patterns that could only be explained by evoking a wave-like nature for light.

Before the nineteenth century, the wave-like properties of light were not known. They got to know that light behaved like a wave thanks to Thomas Young's double slit experiment which he performed in the early 1800s.

Thomas Young made use of a light source (probably sunlight), barriers with one or two slits, and a screen for observation. First, he allowed light to pass through a slit in the barrier. Due to diffraction, the light that passed through the slit spread out into wave fronts, with the slit becoming the new light source. Another barrier with two slits was then put after the first one, just at the right distance, As expected the light from the first barrier passed through the two slits on the second barrier. The observation screen was placed after the second barrier.

There were two possible results from this experiment. One was that the sum of the intensity of light from each slit will give the intensity of both slits. In this case, light would be a particle. The second possible result was that dark and light bands will be created on the observation screen due to the interference patterns made by the superposition of light. In this case, light would be a wave.

At the end of the experiment, interference patterns were observed on the screen, which showed that light travelled in waves. Hence, Thomas Young's double slit experiment showed the wave-like nature of light.

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Answer:

force, displacement & cause.

Explanation:

there must be a displacement and the force must cause the displacement.

i hope this helps you ahh

There are 12 more squares than triangles on a poster that has a mixture of 36 squares and triangles. The task is to determine the number of triangles on the poster.

To solve this problem, we can set up an equation. Let's represent the number of squares as "x" and the number of triangles as "y". Given that there are 12 more squares than triangles, we can write the equation: x = y + 12. We also know that the total number of squares and triangles on the poster is 36, so we can write another equation: x + y = 36.

Now, we can substitute the value of x from the first equation into the second equation: y + 12 + y = 36.
Simplifying the equation, we get: 2y + 12 = 36.
Subtracting 12 from both sides, we have: 2y = 24.
Dividing both sides by 2, we find: y = 12.
Therefore, there are 12 triangles on the poster.
In conclusion, the number of triangles on the poster is 12.

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In physics, we use vector addition to calculate the net force direction when more than one force is applied. Given the separate x and y components of two forces, F₁ and F₂, we sum the components respectively to find the x and y components of the net force. The arctangent of the ratio Fy/Fₓ then gives the direction in degrees relative to the x-axis.

In physics, specifically in mechanics, you can calculate the net force direction when two forces, F₁ and F₂, are being applied by using vector addition. Vector addition can be visualized graphically using arrows or mathematically using components. In this case, since the forces are given in the form of components (x and y), let's handle it mathematically, the x-component of the net force (Fₓ) will be the sum of the x-components of F₁ and F₂. Similarly, the y-component of the net force (Fy) will be the sum of the y-components of F₁ and F₂. This gives us Fₓ = 5.01N + 3.01N and Fy = 3.0N + 2.0N. The direction of the net force can then be calculated using arctangent of the ratio Fy/Fₓ. This will give the direction in degrees relative to the x-axis.

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option "C". 'ε​​​​​0​​' is the permittivity of free space,'A' the area of each plate, and,'d' is the distance between the plates,Hence, to get capacitance C/2, we can decrease the area of the plates by a factor 2, putting A=A/2 in the above formula, we get value of new capacitance half of the previous one.

Increasing the spacing would only result in a drop in capacitance because the capacitance was inversely related to the separation, or the length between the plates.

Increase the surface area of the parallel plate capacitor, shorten the distance between the plates, and utilize a dielectric material with a greater dielectric breakdown strength between the plates if you wish to improve capacitance.

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Answer:

a = - 11.53[m/s^2]

Explanation:

The airplane slows down as its speed decreases from the initial value of 610 [m/s] to zero.

To calculate the acceleration value we use the following kinematics equation:

\(v_{f} = v_{i}+(a*t)\\\)

where:

Vf = final velocity = 0

Vi = initial velocity = 610 [m/s]

a = acceleration [m/s2]

t = time = 53 [s]

Now replacing:

0 = 610 + (a*53)

-610 = 53*a

a = - 11.53[m/s^2]

The negative sign means that the aircraft is losing speed, i.e. slowing down

The product (2 amperes × 2 volts × 2 seconds) is equal to 8 joules.

The formula for electrical power is P = VI, where P is power in watts, V is voltage in volts, and I is current in amperes. The product of amperes, volts, and seconds can be rearranged as follows:

(2 amperes × 2 volts × 2 seconds) = (2 amperes) × (2 volts) × (2 seconds)

= (4 volts) × (2 seconds) × (2 amperes)

= (4 volts) × (4 coulombs/second)

= 16 joules

However, the question asks for the product in units of coulombs, newtons, joules, calories, or newton-amperes. Since the answer is in joules, the correct option is (C) 8 joules.

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Carrying a load on one's head can indeed be considered as a form of work. Work, in physics, is defined as the transfer of energy from one object to another, resulting in the displacement of the second object in the direction of the applied force.

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The force stood needed to stretch the spring by the initial 15cm exists  1420 N.

The motion between two positions back and forth, or swinging back and forth like a pendulum exists comprehended as oscillation.

A condition where competing forces or activities exist in balance exists named equilibrium.

Tensional force exists as the force exerted by a stretched item.

It could be a rope, string, elastic band, or wire that exists being extended.

The object's tensional force exists used to the object stretching it.

The stretched object exists subject to tensile force.

Force stood needed to stretch the spring by the initial 15cm exists 1420 N.

Let, m = 15, P = 0.25, x = 0.15

F = -K x for spring

where, F is the force

K be the constant

ω \(= (K/m)^{1/2\)

where, ω be the angular frequency

m b the mass of the block

\($\omega^2 = K / m\)

\(K = m \omega^2\) \(= m (2 \pi f)^2\)  \(= m 4 \pi ^2 / P^2\)

K = 4\(\pi ^2\) m / \(P^2\)

\(F = K x = x * 4 \pi ^2 m / P^2\)

\(F = 0.15 * 4 * \pi ^2 * 15 / 0.25^2\)

F = 1420 N

The force stood needed to stretch the spring by the initial 15cm exists  1420 N.

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Answer:

what is the question?

The galvanometer consists of a moving coil, suspension and a permanent magnet. The galvanometer consists of a loop that is in the magnetic field. When current is passed through this loop the wire experiences a torque.

Thu the statement is true.

The displacement of the train to the west is 478 km.

To find the displacement to the west, we need to use the Pythagorean theorem, which states that in a right triangle, the square of the length of the hypotenuse (the straight-line distance from the starting point to the ending point) is equal to the sum of the squares of the lengths of the other two sides.

Let's call the displacement to the west "x". Then, the displacement to the south is 42 km, and the total displacement (the distance traveled by the train) is 478 km. Using the Pythagorean theorem, we can write the following equation:

x^2 + 42^2 = 478^2

Expanding the squares:

x^2 + 42^2 = 478^2

x^2 + 1764 = 229284

x^2 = 227620

x = 478 km

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Correct option is C)  the acceleration of gravity at that altitude is 9.75m/s².

The unit g stands for gravitational acceleration. At sea level, the standard value of g on earth's surface is 9.8 m/s2.

The following formula is used to determine the acceleration of gravity:

g= GM/r2

What G The general gravitational constant is what it is.

G is equal to 6.674x10⁻¹¹ Nm2/kg2, and M is the earth's mass:

M = 5.972x10²⁴kg

The radius of the earth plus the airplane's altitude, or r, is the distance from the earth's center in this case:

r = 6.37x10⁶ m + 20000 m equals 6.39x10⁶ m

Consequently, the acceleration in g is equal to:

(6.674x10⁻¹¹ Nm²/kg²)(5.972x10²⁴ kg) / (6.39x100m)₂

g = 9.75m/s²

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Complete Question -

You are on an airplane traveling with a constant velocity at an altitude of 20,000m. What is the acceleration of gravity at that altitude? The earth's radius is 6.37 x 10^6m.. . A) 9.81 m/s^2. B) 9.78 m/s^2. C) 9.75 m/s^2. D) 9.72 m/s^2. E) 9.69 m/s^2.

∑F = m.a

5 - 3 = 1.5 x a

a = 1.3 m/s²

vf² = vi² + 2ad (vi = o at rest)

vf² = 2 x 1.3 m/s² x 0.5

vf² = 1.3

vf = 1.14 m/s

a. The ball was in the air for 5.53 seconds.

b. The initial velocity of the ball is 54.194 m/s

c. The final velocity of the ball in the y direction is -54.194 m/s

d. The x component of the initial velocity is 50.926 m/s, and the y component is 18.534 m/s.

To solve these questions, we can use the equations of motion for projectile motion. Let's assume the acceleration due to gravity is -9.8 m/\(s^2\) (taking downward as the negative direction).

a. To find the time the ball was in the air, we can use the equation:

Δy = v_iy * t + (1/2) * a_y * \(t^2\)

Where Δy is the vertical displacement, v_iy is the initial vertical velocity, a_y is the vertical acceleration, and t is the time.

Since the ball was dropped from rest, its initial vertical velocity is 0 m/s, and the vertical displacement is -150 m (negative because it is going downward).

-150 = 0 * t + (1/2) * (-9.8) * \(t^2\)

Simplifying the equation and solving for t, we get:

4.9 * \(t^2\) = 150

\(t^2\) = 150 / 4.9

t ≈ 5.53 seconds

Therefore, the ball was in the air for approximately 5.53 seconds.

b. To find the initial velocity of the ball, we can use the equation:

v_fy = v_iy + a_y * t

Where v_fy is the final vertical velocity.

Since the ball lands 30 m away, its final vertical displacement is 0 m, and the time is 5.53 seconds.

0 = v_iy + (-9.8) * 5.53

Solving for v_iy, we get:

v_iy = 9.8 * 5.53

v_iy ≈ 54.194 m/s

Therefore, the initial velocity of the ball is approximately 54.194 m/s.

c. The final velocity of the ball in the y direction is the same as the initial velocity because the only force acting on it is gravity, which causes a constant acceleration. Therefore, the final velocity in the y direction is approximately -54.194 m/s (negative due to the downward direction).

d. When the ball is kicked off the building at an angle of 20 degrees below the horizontal, we need to find the x and y components of the initial velocity.

The magnitude of the initial velocity (from part b) is 54.194 m/s.

The x component of the initial velocity can be found using:

v_ix = v_i * cos(θ)

Where θ is the angle of 20 degrees below the horizontal.

v_ix = 54.194 * cos(20)

v_ix ≈ 50.926 m/s

The y component of the initial velocity can be found using:

v_iy = v_i * sin(θ)

v_iy = 54.194 * sin(20)

v_iy ≈  18.534 m/s

Therefore, the x component of the initial velocity is approximately 50.926 m/s, and the y component is approximately 18.534 m/s.

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The question was Incomplete, Find the full content below:

A soccer ball is kicked off a 150 m tall building and lands 30 m away.

a. How long was the ball in the air?

b. What was the initial velocity of the ball?

C. What is the final velocity of the ball in the y direction?

d. Assume the ball has the same speed as you solved for in part b except it is kicked off the building at an angle of 20 degrees below the horizontal. What is the x component of the initial velocity? What is the y component of the initial velocity?

Answer:

10,000 m/s per 100 seconds

Answer:

1.96m/s^2

Explanation:

According to Newtons second law;

F = ma

a = F/m

a = nR/m

a = nmg/m

a = ng

n is he coefficient of friction = 0.2

g  = 9.8m/s^2

a = 0.2 * 9.8

a = 1.96m/s^2

Hence the acceleration of the box is 1.96m/s^2