Scientific ideas about the solar system have changed over time. Which of them
following statements best compares older models of the solar system with the
currently accepted model?
A. In older models, Earth's distance from the sun changed, while in the current
model, Earth's distance from the sun is constant.
B. Older models showed planets moving in circular orbits, while in the current
model, planets move in elliptical orbits.
C. In older models, Venus was closest to the sun, while in the current model,
Mercury is closest to the sun.
D. Older models included ten planets, while the current model includes
eight planets

A star will ultimately become a black hole when it collapses due to end of fuel.

When a star burns through the last of its fuel, the object may collapse, or fall into itself. For smaller stars which are about three times the sun's mass, the new core will become a white dwarf but when a larger star collapses, it turns into a black hole.

So we can can conclude that a star will ultimately become a black hole when it collapses due to end of fuel.

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Explanation:

Time taken by Beetle A = Distance/Speed = 34.0 cm / 2.49 mm/s = 13654.62 ms = 13.65 s

Time taken by Beetle B = Distance/Speed = 34.0 cm / 4.55 mm/s = 7472.53 ms = 7.47 s

Since Beetle A has a 5.0-cm head start, it finishes the race in 13.65 s, but Beetle B only runs for 13.65 s - 7.47 s = 6.18 s.

Now, we can calculate the distance between the beetles at the end of the race:

Distance covered by Beetle A = 2.49 mm/s x 13654.62 ms = 34.0 cm + 2.49 mm/s x 5.0 cm = 35.72 cm

Distance covered by Beetle B = 4.55 mm/s x 6.18 s = 2.81 cm

So the separation distance between the beetles at the end of the race is:

35.72 cm - 2.81 cm = 32.91 cm = 329.1 mm

Therefore, the separation distance between the beetles when the first beetle reaches the end of the box is 329.1 mm.

The difference between the momentum before and after the bounce was 1.407 kg/s.

initial energy = mg(3) J = 29.4J

After bouncing ,energy = mg(2) =19.6J

Ball's change in energy = 29.4J - 19.6J = 9.8J

This energy is dissipated in the form of heat energy or sound energy.

work done during the bounce = 9.8J

change in momentum = mvf-mvi

29.4 = 1/2m\(vi^{2}\)

vf =7.668m/s

19.6J =1/2m\(vf^{2}\)

vf=6.261m/s

Change in momentum = m(vf-vi) = 1kg x (-1.407m/s) = -1.407

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Answer:

Distance

Explanation:

a) The value of the required velocity is v(t) = t²/2 - 4t + 4e⁻⁵

b) The value of the required distance is S(t) = t³/6 - 2t² + 4e⁻⁵t + 5

c) The value of the velocity when t = 9 is approximately -28.2 m/sec

(a)To find v(t), we need to integrate a(t) first

a(t) = 2∫

a(t) dt = ∫ 2

dt = 2t + C1

Here, C1 is the constant of integration

Next, we need to integrate v(t) by substituting the value of a(t) into it

v(t) = ∫ (2t + C1)

dt= t² + C1t + C2

Here, C2 is another constant of integration

v(0) = - 4⇒ C2 = - 4

Also, given: v(t) = Vt + 4e⁻⁵

Comparing the above two equations:

v(t) = Vt + 4e⁻⁵ = t² + C1t - 4

On differentiating with respect to t, we geta(t) = 2

Therefore, we get the differential equation as:

Vt + 4e⁻⁵ = t² + C1t - 4 - - - - - - (1)

To find v(t), we need to solve this differential equation

Substituting t = 0, in (1), we get

-4 + 4 = 0 + C1(0)⇒ C1 = 0

Therefore, the differential equation becomes:

Vt + 4e⁻⁵ = t² - 4

On differentiating the above equation w.r.t t, we get:

a(t) = 2

Therefore, we get

v(t) = t²/2 - 4t + 4e⁻⁵ - - - - - - (2)

Thus, the required velocity is given by:

v(t) = t²/2 - 4t + 4e⁻⁵

Part (b) To find s(t), we need to integrate v(t) first

v(t) = t²/2 - 4t + 4e⁻⁵∫ v(t)

dt = ∫ (t²/2 - 4t + 4e⁻⁵)

dt= t²/6 - 2t² + 4e⁻⁵t + C3

Here, C3 is the constant of integration

Also, given that S(0) = 5⇒ C3 = 5

Therefore, we get

S(t) = t³/6 - 2t² + 4e⁻⁵t + 5 - - - - - - (3)

Thus, the required distance is given by:

S(t) = t³/6 - 2t² + 4e⁻⁵t + 5

Part (c) To find the velocity when t = 9We can use the value of v(t) obtained in part (a)⇒ v(9) = (9)²/2 - 4(9) + 4e⁻⁵⇒ v(9) = - 28.2 (approx)

Thus, the velocity when t = 9 is -28.2 (approx)m/sec.

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The location at which the net gravitational force exerted on the spaceship is approximately zero is position c. The correct option is c.

Gravity, also known as gravitational force, pulls objects with mass toward one another. We frequently consider the force of gravity from Earth. This force is responsible for keeping your body on the ground.

Any item with mass, on the other hand, exerts a gravitational force on all other objects with mass. There is a net force because the force exerted by the Earth exceeds the force exerted by the Moon.

Therefore, the correct option is c, position C.

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The question is incomplete. Your most probably complete question is given below:

The image is also added below:

A. position A.

B. position B.

C. position C.

D. cannot be determined.

48 m/s in terms of km/h is 720.8 km/h. In terms of m/min is 2880 m/min, in terms of km/s is 0.048 km/s and in terms of km/min is 2.88 km/min.

To solve this question, we need to understand some terms. The unit of velocity is measured in m/s. It can be expressed in different units of velocity.

1 km (kilometer) = 1000 meter

1 h (hour) = 3600 seconds

1 minutes = 60 seconds

To convert m/s into km/h,

48 m/s * 3600/1000 =  172.8 km/h

To convert m/s into m/min,

48 m/s * 60 = 2880 m/min

To convert m/s into km/s,

48 m/s ÷ 1000 = 0.048 km/s

To convert m/s into km/minutes,

48 m/s * 60 / 1000 = 2.88 km/min

Therefore, the 48 m/s expressed is 172.8 km/h, 2880 m/min, 0.048 km/s and 2.88 km/min.

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48 m/s is equivalent to  172.8 km/h, 2880 m/min, 0.048 km/s, and 2.88 km/minute.

To express 48 m/s in different units of velocity:

km/h (kilometers per hour):

To convert m/s to km/h, we can use the conversion factor of 3.6 since 1 m/s is equal to 3.6 km/h.

48 m/s * (3.6 km/h / 1 m/s) = 172.8 km/h

Therefore, 48 m/s is equivalent to 172.8 km/h.

m/min (meters per minute):

To convert m/s to m/min, we can use the conversion factor of 60 since there are 60 seconds in a minute.

48 m/s * (60 m/min / 1 s) = 2880 m/min

Therefore, 48 m/s is equivalent to 2880 m/min.

km/s (kilometers per second):

Since 1 kilometer is equal to 1000 meters, to convert m/s to km/s, we divide the value by 1000.

48 m/s / 1000 = 0.048 km/s

Therefore, 48 m/s is equivalent to 0.048 km/s.

km/minute (kilometers per minute):

To convert m/s to km/minute, we first need to convert m/s to km/s (as calculated in the previous step) and then multiply by 60 to convert seconds to minutes.

0.048 km/s * 60 = 2.88 km/minute

So, 48 m/s is equivalent to 2.88 km/minute.

Hence, 48 m/s is equivalent to approximately 172.8 km/h, 2880 m/min, 0.048 km/s, and 2.88 km/minute.

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Answer:

0.303 seconds

Explanation:

We need to find the time that the cell phone takes to reach the sink. So, we will use the following equation

Where

yi is the initial position, so yi = 0.45 m

vi is the initial velocity. Since it is freefall, vi = 0 m/s

a is the acceleration due to gravity, so a = -9.8 m/s²

y is the final position, so y = 0 m

t is the variable that we need to find.

So, replacing the values, we get:

Now, we can solve for t

Therefore, you have 0.303 seconds before your cell phone is ruined.

The most common injury related to electrical hazards are Electrical burns.

What are electrical hazards?

An electrical burn is a type of skin burn that develops when your body comes into contact with electricity. It is possible for electricity to pass through your body when it comes into contact with it. When this occurs, the voltage has the potential to harm tissues and organs.

Hence, The most common injury related to electrical hazards are Electrical burns.

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-- impurities in the water

-- air pressure is higher than standard

Answer:

The potential difference at the customer's house is 117.1 V.

Explanation:

a) The potential difference at the customer's house can be calculated as follows:

\( \Delta V_{h} = \Delta V_{p} - \Delta V_{l} \)

Where:

\(V_{h}\): is the potential difference at the customer's house

\(V_{p}\): is the potential difference from the main power lines = 120 V

\(V_{l}\): is the potential difference from the lines

\( \Delta V_{h} = \Delta V_{p} - IR \)

The resistance, R, is:

\(\frac{0.109 \Omega}{300 m}*2*34.0 m = 0.025 \Omega\)

Now, the potential difference at the customer's house is:

\(\Delta V_{h} = 120 V - 116A*0.025 \Omega = 117.1 V\)

Therefore, the potential difference at the customer's house is 117.1 V.

I hope it helps you!

Answer: the answer Is A. Maria checked her ice cube every half hour and forgot to reseal the container she put the ice cube in

Explanation: I just took the test

Answer:

A

Explanation:

APEX:)

Answer:

114.7 psi

Explanation:

Absolute pressure = atmospheric pressure + gauge pressure

                               = 14.7  psi     + 100 psi  = 114 .7 psi (sea level)

To determine the D- shaped angles of both the incident and refraction light, we'll have used a laser, a piece of substance (glass, acrylics, or filled with a liquid of our choice), and a "rays table."

We shall strong sunlight in the direction of the D-shaped object's flat face. The angle between the light ray's normal as well as the surface normal where the light will strike the surface is i. Afterwards when, it will be refracted and departure from of the surface at an angle of r. Snell's Law stipulates that the ratio of both the refractive index determines the level of light deformation. This configuration will be used to determine the material's index of refraction for the D-shaped device (glass, acrylic or some liquid). To correctly test the refractive index, nevertheless, the apparatus must be positioned with great care.

The critical angle for the crowning glass-water interface is 61.0 degrees. The combination of materials on each side of the barrier determines the real value of both the critical angle. Let's take a look at two distinct media, channel I (incident medium) and intermediate r.

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The tension in the cord is 81.82 N, if the elevator moves 1 m in the first 1.8 seconds.

Initial speed of the elevator, u = 0 (at rest)

Distance travelled by the elevator, S = 1 meter

Time taken to cover the that distance, t = 1.8 s

Let the acceleration of the elevator = a

Mass of the bundle, m = 8.9 kg

By the second equation of motion,

S =ut + 0.5at²

1 = 0 × 1.8 + 0.5×a×1.8²

a = 2/1.8²

Acceleration, a = 0.617 m/s²

Weight of the bundle acting downward = 8.9×9.81 = 87.31 N

Upward force on the bundle, F = 8.9 × 0.617 = 5.49

Net tension in the cord = (87.31 - 5.49)

= 81.82 N

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A unit showing the intensity of the sound level is known as the decibel. In physics, this unit of sound intensity is shown by dB. The loudness of a sound depends on its density. The correct option is B.

The formula used to calculate the intensity of sound is:

Intensity in dB = 10 log (Intensity in W/m² / Threshold intensity)

β = 10 log (I / I₀)

80 = 10 log (I/ 1 × 10⁻¹²)

log (I/ 1 × 10⁻¹²) = 80 / 10

log (I/ 1 × 10⁻¹²) = 8

I / 1 × 10⁻¹² = 10⁸

I = 10⁸ ( 1 × 10⁻¹²)

I =  10⁸ × 10⁻¹²

I = 10⁻⁴ W / m²

I₁ = I / 100

10⁻⁴ / 100 = 10⁻⁶ W / m²

β₂ = 10 log (I₁ / I₀)

10 log ( 10⁻⁶ /  1 × 10⁻¹²) = 60 dB

Thus the correct option is B.

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For the given potential energy, the value of mass equals 0.4Kg.

The energy that was previously stored in the items before they were pushed out of balance by elastic rebound, gravity, or chemical reactions is released when the objects are displaced from their equilibrium locations.

Potential energy is the energy that an object accumulates because of its position, enabling it to perform more work. An extended rubber band, for instance, is full of potential energy. Similar to this, a ball will have more potential energy when released above the ground than when it falls.

Given,

The potential energy = 15J,

height of the object = 3.75m

Using the formula,

PE= mgh

Now substituting the values in the formula,

⇒ 15 = m × 10 × 3.75    [The value of acceleration due to gravity(g) = 10]

⇒ m = 15 / 10 × 3.75

⇒ m = 0.4Kg

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Answer:

A quantity which does not depend on direction is called a scalar quantity. Vector quantities have two characteristics, a magnitude and a direction. Scalar quantities have only a magnitude. When comparing two vector quantities of the same type, you have to compare both the magnitude and the direction.

I rarely share my notes. But these are my last year notes, so I can share with you. Click on the photo to view the answer.

The block and table have a sliding friction coefficient of 0.083.

Although friction is assumed to be created by the interaction between the microscopic bumps on surfaces when they brush against each other, scientists are not entirely sure what causes it. It is challenging for the surface to slide over one another because the spikes on each surface flex and exert stress on one another.

The friction between both the edges can be decreased by using lubricants like oil or grease. Friction can be decreased by cleaning the surface, which makes it smooth.

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A is the surface area of the pipe, Ts is the temperature at the outer surface of the pipe, and To is the temperature of the air.

What is Temperature?

Temperature is a measure of the average kinetic energy of the particles in a substance, which determines the direction of heat flow. It is a scalar quantity that quantifies the hotness or coldness of an object or a system.

a. To find the steady state temperature profile within the pipe wall, we can apply the steady-state heat conduction equation. Since the pipe is made of copper, which is a good conductor of heat, we can assume one-dimensional radial conduction along the radial direction.

The heat conduction equation in cylindrical coordinates is given by:

∂/∂r (r * k * ∂T/∂r) = 0

where:

r is the radial distance from the center of the pipe

k is the thermal conductivity of copper (given as 400 W/(m.K))

T is the temperature

Considering the inner and outer surfaces of the pipe, we can set up the boundary conditions:

At r = r₁ (inner surface of the pipe): T = 300°C (temperature of saturated steam)

At r = r₂ (outer surface of the pipe): T = Tₒ (temperature of air, given as 20°C)

Solving the heat conduction equation with the given boundary conditions, we can obtain the steady state temperature profile within the pipe wall.

b. The rate at which heat is being removed from the pipe by air can be calculated using the convective heat transfer equation, which is given by:

Q = h * A * (T - Tₒ)

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Answer:

I = 250N*s

Explanation:

I = F*t

I =  impulse or momentum

F = Force

t = time

I = 25N*10s

I = 250N*s

Answer:

Centripetal Acceleration = v^2/r

= (circumference/time)^2/r

= (2*pi*r/t)²)/r

= ((2³.14*50/14.3)²)/50

= 9.64 m/s²

brainlist?

Explanation:

The electric force between the rod and the cloth is 4.6 x 10⁷ N.

The electric force between the rod and the cloth is calculated by apply Coulomb's law.

This law states that electric force between two charged bodies is directly proportional to the product of the charges and inversely proportional to the distance between the charged bodies.

Mathematically, this law is given as;

F = kq²/r²

where;

Substitute the given parameters and solve for the electric force between the rod and the cloth as shown below.

F = kq²/r²

F = (8.99 x 10⁹ x 14.3 x 10⁻³ x 14.3 x 10⁻³) / (0.2)²

F = 4.6 x 10⁷ N

Thus, the electric force between the rod and the cloth is determined by applying Coulomb's law.

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Answer:

8.57 m/s

Explanation:

From the question,

The total momentum of the car before the load was dropped = Total momentum of the call after the load was dropped.

Mu =  (M+m)V........................... Equation 1

Where M = mass of the car, u = initial speed of the car, m = mass of the load, V = final speed of the load.

make V the aubject of the equation

V = mu/(M+m)...................... Equation 2

Given: M = 15000 kg, m = 6000 kg, u = 12 m/s,

Substitute these values into equation 2

V = (15000×12)/(15000+6000)

V = 180000/21000

V = 8.57 m/s

The false statement is B) Homolytic bond cleavage yields neutral radicals in which each atom gains one electron.

In homolytic bond cleavage, each atom retains one electron from the shared pair of electrons, resulting in the formation of two neutral radicals, where each atom retains its original number of electrons.

No atoms gain or lose electrons in this process.

In a homolytic bond cleavage, a covalent bond is broken, and the shared pair of electrons is split equally between the two atoms involved in the bond.

This results in the formation of two neutral radicals, with each atom retaining one of the electrons from the shared pair.

A radical is a chemical species characterized by the presence of an electron that is unpaired, meaning it does not have a partner electron with which it forms a complete pair. When a covalent bond is homolytically cleaved, each atom involved in the bond gains one electron, resulting in the formation of two radicals.

These radicals are highly reactive due to the presence of the unpaired electron, which makes them prone to participate in further chemical reactions.

It's important to note that in homolytic bond cleavage, there is no transfer of electrons from one atom to another.

Instead, the bond is broken in a way that allows each atom to retain one of the electrons, leading to the formation of two neutral radicals.

Therefore, statement B, which suggests that each atom gains one electron, is false.

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Answer:

52 kilometers

Explanation:

Since we know that there are 1,000 meter in 1 kilometer, we can divide 52,000 by 1,000 (because we want know that every 1,000 meter is 1 kilometer).

52,000/1,000= 52 kilometers

That's your answer.

Hope this helped! :)

Answer:

52 Kilo

Explanation:

52,000/1,000= 52 kilometers

Answer:

12 pounds mine does

Explanation:

Answer: 10 pnds

Explanation:

Answer:

vega the first one

pb

p

Explanation: