Astronomers observe two galaxies, A and B. Galaxy A has a recessional velocity of 1000 km/s, while galaxy B has a recessional velocity of 2000 km/s. This means that:

Answer:

Answer: D. Only R

Explanation:

The Principle Of Conservation Of Mechanical Energy

In the absence of friction, the total mechanical energy is conserved. That means that

Em=U+K is constant, being U the potential energy and K the kinetic energy.

At the top of the path (point Q), Joshua is at rest but his height is at a maximum. Thus his kinetic energy is zero.

At point P, Joshua is at the minimum level (potential energy zero) and his speed is at a maximum.

At point R, Joshua has some height and some speed which means he has both types of energy.

Answer: D. Only R

Answer:

5000°A

Explanation:

If it is right answer so please mark me as brainleist anwer as ur wish

Ocean water conducts electrical current because it contains salt, which breaks down into charged ions that are free to move and carry an electrical charge.

The presence of these charged ions makes ocean water an electrolyte, a substance that can conduct electricity.

Specifically, ocean water is a strong electrolyte, which means that it contains a high concentration of dissolved salts and thus can conduct electricity more easily than weak electrolytes.

The most common salt in ocean water is sodium chloride (NaCl), which breaks down into positively charged sodium ions (Na+) and negatively charged chloride ions (Cl-) when dissolved in water.

These charged ions are what allow electrical current to flow through ocean water.

When a voltage is applied to the water, the positive sodium ions are attracted to the negative electrode while the negative chloride ions are attracted to the positive electrode, creating a flow of electricity.

It's worth noting that the conductivity of ocean water can vary depending on factors such as temperature, pressure, salinity, and the presence of other dissolved substances.

However, in general, ocean water is an excellent conductor of electricity and is used in a variety of applications such as underwater communication cables and electrochemical processes.

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Jupiter's volume is more than ten times as large as Saturn's volume. This statement is true. Jupiter is the largest planet in our solar system with a volume of about 1,431,281,810,739 km³ while Saturn is the second-largest planet with a volume of about 827,129,915,150 km³.

Jupiter is approximately 11 times larger than Saturn. The two planets belong to the gas giant category, and they share many similarities such as having a large number of moons. Jupiter is famous for its Great Red Spot and powerful magnetic field, while Saturn is well-known for its stunning ring system. Both planets have been the focus of scientific research and exploration, and they continue to fascinate scientists and stargazers alike. In conclusion, Jupiter's volume is more than ten times as large as Saturn's volume.

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The speed of sound in the steel railroad rails is approximately 6131 m/s.

The speed of sound is defined as the distance traveled by a sound wave per unit time.

In this case, the sound wave travels through the steel railroad rails for a distance of 2350 m.

The time it takes for the sound wave to travel through the rails is given as 0.383 s.

To calculate the speed of sound, we use the formula:

Speed = Distance / Time

Plugging in the given values, we have:

Speed = 2350 m / 0.383 s

Speed ≈ 6131 m/s

Therefore, the speed of sound in the steel railroad rails is approximately 6131 m/s.

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The critical damping occurs when the spring returns to its equilibrium position without oscillating. In this case, the damping constant (c) is equal to the value required to achieve critical damping.

To find the mass (m) that would produce critical damping, we can use the equation:
c = 2 * sqrt(m * k)
where c is the damping constant, m is the mass, and k is the spring constant.

Given that the damping constant is 8 (kg/s) and the spring is stretched 1.5 meters beyond its natural length by a force of 6 newtons, we can use this information to find the spring constant (k) using Hooke's Law:
F = k * x
where F is the force applied, k is the spring constant, and x is the displacement from the equilibrium position.

Substituting the given values, we have:
6 N = k * 1.5 m

Solving for k, we find:
k = 6 N / 1.5 m = 4 N/m

Now, we can substitute the values of c and k into the equation for critical damping:
8 = 2 * sqrt(m * 4)

Dividing both sides by 2 and squaring, we get:
16 = 4 * m

Simplifying further:
m = 16 / 4 = 4 kg

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Answer:

They are both eletro-magnetic waves,  they are both outside of the range humans can see with our eyes. Infrared waves can can carry enough energy to give heat to objects.  There is a lot of Infrared light that is put out by a fire and we feel that as the heat.  Radio waves can be used to carry other signals like when we listen to the radio.  

Explanation:

Answer:

Both infrared and radio waves are longer than visible light and are not considered harmful to humans.Infrared light is how remote controls communicate with electronics like televisions and stereos, while radio waves are how cell phone signals are transmitted.

Explanation:

This is what my teacher wrote as the answer lol.

The friend sitting on the shore sees Emily's speed as 2 m/s when she paddles upstream in a river that runs downstream at 6 m/s.

The relative velocity of Emily's canoe with respect to the shore observer can be calculated by considering the velocities of the canoe and the river. When Emily paddles upstream, her speed relative to the water is the difference between her canoe's speed and the downstream flow of the river. In this case, Emily's speed relative to the water is 8 m/s - 6 m/s = 2 m/s. Since the observer on the shore is stationary relative to the water, they see Emily's canoe moving at the same speed relative to them as it does relative to the water, which is 2 m/s.

Using the formula for relative velocity, which is given by \(\[v_{\text{relative}} = v_{\text{object}} - v_{\text{reference}}\]\), we subtract the downstream velocity of the river from Emily's canoe's speed to find her speed relative to the water. The observer on the shore sees Emily's speed as the same as her speed relative to the water, as they are stationary relative to the water. Thus, the friend sitting on the shore sees Emily's speed as 2 m/s.

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Answer:

A) 1.3013476 × 10²⁸ N·m

b) 2.8618128 × 10²⁹ J

c) 4.73183333 × 10²³ W

Explanation:

The mass of the Earth, M = 5.972 × 10²⁴ kg

The radius of the Earth, R = 6,371 km

The angular speed of the Earth, ω = 2·π/(24 hr) = 7.27220522 × 10⁻⁵ rad/s

The shape of the Earth ≈ Spherical

The moment of inertia of a sphere, I = (2/5)·M·R²

The angular acceleration of the Earth in 7 days from rest its present angular speed, ω, is given as follows;

 α = 7.27220522 × 10⁻⁵ rad/s/((7 × 24 × 60 × 60) s) = 1.2024149 × 10⁻¹⁰ rad/s²  

Torque, τ = I × α

∴ τ = (2/5) × 5.972 × 10²⁴ × 6,731,000² × 1.2024149 × 10⁻¹⁰ = 1.3013476 × 10²⁸

The torque required, τ = 1.3013476 × 10²⁸ N·m

b) The energy required, \(K.E. _{(Rotational)}\) = 1/2 × I × ω²

∴  \(K.E. _{(Rotational)}\) = (1/2) × (2/5) × 5.972 × 10²⁴ × 6,731,000² × (7.27220522 × 10⁻⁵ rad/s)²

The energy required, \(K.E. _{(Rotational)}\) = 2.8618128 × 10²⁹ J

c) Power = Energy/Time

Therefore, the average power required, P = \(K.E. _{(Rotational)}\)/Time

∴ P = 2.8618128 × 10²⁹ J/(7 × 24 × 60 × 60) s) = 4.73183333 × 10²³ Watts

The average power required, P = 4.73183333 × 10²³ Watts.

Answer:

4 m/s in negative acceleration

Explanation:

Acceleration = V- U/t

Where V is the final velocity

U is the initial velocity and t is the time given.

U = 65 m/s

V= 25 m/s

T= 10 seconds

Acceleration= (25m/s - 65m/s)÷10secs

= - 40/10

= -4m/s^2

Hence, it has a negative acceleration.

Answer:

A. negative acceleration of 4 m/s2

Hope this helps!

Explanation:

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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When it reaches the top of the loop-de-loop, it has both potential and kinetic energy.

The car has both potential and kinetic energy, and it is moving at 24.6 m/s. This is the best description of the roller coaster car when it is at the top of the loop-de-loop. A roller coaster car that started at rest at the top of a 93.0 m hill and now is at the top of the first loop-de-loop has both potential and kinetic energy.

The loop is 62.0 meters tall and the track is nearly frictionless, so resistance can be ignored.

Using g = \(9.8 m/s^2\), the car has both potential and kinetic energy, and it is moving at 24.6 m/s. This is because at the top of the loop, the car's velocity is zero but the acceleration due to gravity is\(9.8 m/s^2\).

Therefore, as it moves down the loop, its potential energy is converted into kinetic energy, causing the car to speed up.

As a result, when it reaches the top of the loop-de-loop, it has both potential and kinetic energy.

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Answer:

Explanation:

This problem bothers on the simple harmonic motion of a loaded spring

Given data

mass attached, m= 0-.675 kg

spring constant, k= 72.4 N/m

the period of oscillation can be solved for using the formula bellow

\(T= 2\pi \sqrt{\frac{m}{k} }\)

Substituting the given data into the expression above we have

\(T= 2*3.142\sqrt{\frac{0.675}{72.4} }\\T= 6.284*\sqrt{0.0093 }\\T= 0.6\)

T= 0.6 sec

Answer:

0.607

Explanation:

Trust me

-4m/s^2 the velocity of a ball that rolled to the right 20 cm in 3 seconds

Vi = 20m/s

Vf = 0

t = (t2 - t1) = 8s -3s = 5s

Vf - Vi = a*5s

a = (0- 20m/s)/5s = -4m/s^2

Velocity is a measure of speed in motion or activity. A more concise word for celerity is speed. Physics uses the word "velocity" specifically to describe how quickly and in what direction an object's location changes. It is a vector quantity that expresses the speed and direction of a body's motion.

Velocity is the term for the rate at which a displacement changes. Acceleration is the measure of a change in velocity. Velocity is a vector quantity because it comprises both magnitude and direction. Acceleration is a vector quantity because it is the speed at which velocity varies.

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This was kinda hard thinking it might be that the new force is going to 4 times bigger than the original one.

Answer:

An open umbrella would not hit the ground before the closed one.   Explanation: The closed umbrella would hit first because it doesn't have as much air pressure hitting it. The open one has air pushing against it making it to where the open umbrella floats but falls slowly.    

An open umbrella will hit the ground after a closed umbrella because it has

a larger surface area and more air pressure and resistance.

An open umbrella has more surface araea which means more air particles

interacting with it. This slows it down and is the reason it hits the ground

after the closed umbrella.

Closed umbrella on the other hand have a smaller surface area and less air

resistance which is why it hits the ground faster.

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Answer:

Option (c) is the correct answer.

Explanation: When two substances does not exchange any energy with each other then they are said to be in thermal equilibrium with each other. This means the temperature of both the substances will be equal, that is why, there is no exchange of energy between them. Thus, we can conclude that when the objects have the same temperature then you can tell the two objects are in thermal equilibrium.

Given :

Height from which ball is dropped , h = 40 m .

Acceleration due to gravity , g= 10 m/s² .

Initial velocity , u = 0 m/s .

To Find :

Velocity when ball covered 20 m and velocity when it hit the ground .

Solution :

Now , height when ball covered 20 m distance is , 40 - 20 = 20 m .

By equation of motion :

\(v^2=u^2+2gh\\\\v=\sqrt{2\times 10\times 20}\ m/s\\\\v=20\ m/s\)

Now , distance covered when body reaches ground is , 40 m .

Putting value h = 40 m in above equation , we get :

\(v=\sqrt{2\times 10\times 40}\ m/s\\\\v=20\sqrt{2}\ m/s\)

Hence , this is the required solution .

The gain in momentum of vehicle B is 4000 kg•m/s

The total change in momentum due to the collision is zero.

According to the principle of momentum conservation, momentum is only modified by the action of forces as they are outlined by Newton's equations of motion; momentum is never created nor destroyed inside a problem domain.

As no external force applied, total momentum during collision remains conserved.

Hence, the gain in momentum of vehicle B = the loss  in momentum of vehicle C

=  4000 kg•m/s

And,  the total change in momentum due to the collision is zero.

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(i) The hydraulic gradient is 0.45.

(ii) The flow rate is approximately 0.00000167 cubic meters per second.

(iii) The hydraulic conductivity is approximately 0.000037 meters per second.

(i) Hydraulic gradient:

The hydraulic gradient (i) can be calculated by dividing the head difference (h) by the distance (L) between the manometer tappings:

i = h / L

Given:

Head difference (h) = 45 mm

Distance between manometer tappings (L) = 100 mm

Converting the units to meters:

h = 45 mm / 1000 = 0.045 m

L = 100 mm / 1000 = 0.1 m

Substituting the values into the formula:

i = 0.045 m / 0.1 m = 0.45

(ii) Flow rate:

The flow rate (Q) can be calculated using the equation:

Q = (V / t) / A

Where V is the quantity of water collected, t is the duration of the test, and A is the cross-sectional area of the test sample.

Given:

Quantity of water collected (V) = 500 ml = 0.5 L

Duration of test (t) = 300 seconds

Diameter of test sample (d) = 100 mm

Converting the units to meters:

V = 0.5 L = 0.5 / 1000 = 0.0005 m³

t = 300 seconds

d = 100 mm / 1000 = 0.1 m

Calculating the cross-sectional area (A) using the formula for the area of a circle:

A = π * (d/2)^2

Substituting the values:

A = π * (0.1/2)^2 = π * 0.005^2 = 0.00007854 m²

Substituting the values into the formula for flow rate:

Q = (0.0005 m³ / 300 s) / 0.00007854 m²

Calculating the flow rate:

Q = 0.00000167 m³/s

(iii) Hydraulic conductivity:

The hydraulic conductivity (K) can be calculated using Darcy's Law:

K = Q / (A * i)

Given the values we calculated:

Q = 0.00000167 m³/s

A = 0.00007854 m²

i = 0.45

Substituting the values into the formula:

K = 0.00000167 m³/s / (0.00007854 m² * 0.45)

Calculating the hydraulic conductivity:

K ≈ 0.000037 m/s

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Answer:

Repeatability is how much variability in the measurement system is caused by the measurement device. Reproducibility is how much variability in the measurement system is caused by differences between operators.

The statement "the ball falls faster during the fourth second than it did during the first second" is false.

The ball falls at a constant acceleration due to gravity, which is approximately 9.8 m/s² near the surface of the Earth. Therefore, the speed of the ball increases at a constant rate as it falls. The equation d = 1/2 * g * t² can be used to calculate the distance the ball falls in a given amount of time, where d is the distance, g is the acceleration due to gravity, and t is the time. The statement "the ball falls a greater distance during the fourth second than it did during the first second" would be true.

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Answer:

2.4m/s

Explanation:

Answer:

(1) and (4) are correct

Many more people understand a mass of 1 kg than 1 slug which is the mass of a weight of 1 lb

Metric amounts are easily converted using the base 10 scale

(1 gram = 10^-3 kg)

Given the mass of the biker is m = 75.0 kg.

The constant velocity is v = 5.00 m/s.

The momentum of the biker is calculated by the formula.

Put the given values,

Thus, the biker's momentum is p = 375 kg m/s.

The gravitational acceleration experienced by the spacecraft would be  13.33 m/s^2.

The maximum velocity the spacecraft can reach would be 1633.5 m/s.

The kinetic energy of the spacecraft would be KE = 1/2mv^2

The gravitational acceleration experienced by the spacecraft as it falls toward the planet's surface can be calculated using the formula

Thus:

g = (6.67 x 10^-11 N m^2/kg^2) * (4/3 * pi * (5000 km)^3 * 5500 kg/m^3) / (10000 km)^2 = 13.33 m/s^2.

The maximum velocity that the spacecraft can reach just before impacting the planet's surface can be calculated using the formula

The height from which the spacecraft falls is equal to the distance from the planet's surface to the spacecraft's initial position, which is 10,000 km - 5000 km = 5000 km.

Thus, v = sqrt(2 * 13.33 m/s^2 * 5,000,000 m) = 1633.5 m/s.

The kinetic energy of the spacecraft just before impacting the planet's surface can be calculated using the formula

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Answer:

:)

Explanation:

Population is how many people or citizens are in that country or continent.

For someone who claims that based on temperature measurements, the temperature of fluid rises during a throttling process,  this assertion is true since no thermodynamic rules are broken.

Generally, Thermodynamics is simply defined as a field of science that is responsible for the relationship between heat and other types of energy.

In conclusion, The temperature of the fluid fluctuates or stays the same during the throttling process.

As a result, this assertion is true since no thermodynamic rules are broken.

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A listed DC power supply with a maximum output of 10 amps is recommended for supplying power to a pipe organ. This will provide a stable and consistent source of power to ensure optimal performance and reliability.

DC power supply for a pipe organ should be of a listed DC power supply with a maximum output of 10 amps. It is important to use a listed DC power supply to ensure that it meets certain safety and performance standards.The maximum output of the DC power supply depends on the specific requirements of the pipe organ. In this case, a maximum output of 10 amps is recommended

which should be sufficient to power most pipe organs.A DC power supply is necessary for a pipe organ because it requires a stable and constant source of power. This is because a pipe organ consists of a large number of pipes and other components that require electricity to function properly.

A DC power supply is preferable over an AC power supply because it provides a more stable and consistent source of power. This is important because any fluctuations in the power supply can affect the sound and performance of the organ.The use of a listed DC power supply is important to ensure that it meets certain safety and performance standards.

Listed power supplies have been tested and certified by an independent testing organization to ensure that they meet certain standards for safety, performance, and reliability.

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