A car traveled a distance of 80 km in 45 minutes (0.75 hours). What was the speed of the car? A. 60 km/hr B. 35 km/hr C. 26 km/hr D. 107 km/hr

An alternative way to explain Hubble's Law without relying on the standard Big Bang idea of a universe with no center and no edge is through the concept of a "tired light" hypothesis.

According to this hypothesis, the redshift observed in distant galaxies is not due to their motion away from us in an expanding universe, but rather the result of photons gradually losing energy as they travel through space.

In the tired light scenario, the wavelength of light is thought to stretch over time due to interactions with matter or other unknown processes. As a result, the light from distant galaxies appears redshifted, mimicking the effect of cosmic expansion. This explanation implies that the universe may have a finite size and a center, challenging the notion of an infinite and uniformly expanding universe.

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Answer:

i really dont know

Explanation:

????

Answer: it is located over Ellesmere Island, Canada

Explanation

it is now drifting away from North America and toward Siberia.

Answer:ellesmere island, Canada

It take the marble  0.57 second to hit the ground.

A body's velocity is the rate at which its displacement alters with respect to time. A vector quantity with both magnitude and direction is velocity. The meter/second unit of measurement for velocity.

Given that the horizontal velocity of the marble is: u = 8.00 m/s.

Height of the place: H = 1.60 m.

As their has no initial vertical component of velocity; time taken by the marble to reach the ground: t = √(2H/g)

= √(2×1.60/9.8) second

= 0.57 second.

Hence, time taken to reach ground is 0.57 second.

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Alpha particles have highest mass.

Alpha particles are most ionising.

Gamma particles are the most penetrating.

Beta particles are negatively charged.

Gamma particles have the highest speed.

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The kinetic energies of a light and a heavy body are equivalent. The momentum is greater for the light body.

Momentum is characterized as the intensity of a body's motion. As momentum depends on both velocity and the direction of the body's motion, it is quantified by "mass velocity". Since velocity is a vector and mass is a scalar, momentum is a vector quantity.

As a result of its higher mass, a heavy object will move with more momentum. Only when the average speed of the heavy particles is lower than that of the light particles will the average kinetic energy of the light particles equal the average kinetic energy of the heavy particles.

At the same temperature and pressure, lighter gases will move more quickly than heavier ones. 0K on the Kelvin scale denotes that the particles are not moving.

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Answer:

so basically

Explanation:

ty for the free points tho ez ez ez ez jajjajajajajajjajaj ez ez ez free cash dog water

The magnitude of the vector B is 10.9

A vector is a quantity which has magnitude as well as direction and it follows vector laws of addition.

To calculate the magnitude of the vector, we have to put the square of the components of the vector along the axes under the root.

Vector B has components,

x = 2.4

y = 9.8

z = 4.1

Applying the formula,

|B| = √x²+y²+z²

|B| = √(2.4)² + (9.8)² + (4.1)²

|B| = √5.76+96.04+16.81

|B| = √118.61

|B| = 10.9

Talking about the direction the the Vector B, it will be the line joining the origin with the points (2.4,9.8,4.1)

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System B has the higher internal energy because it has the same temperature as System A but a higher pressure (20 atm compared to 2 atm).

Both systems contain the same amount (10 kg) of the same ideal gas, so the difference in pressure indicates a higher internal energy in System B.

The internal energy of a thermodynamic system is the sum of the kinetic and potential energies of all its particles, such as atoms, molecules, and ions. The internal energy of a gas is related to its temperature, pressure, and the number of particles in the system.

In the case of System A and System B, both contain 10 kg of the same ideal gas and are at the same temperature. This means that the average kinetic energy of the gas particles in both systems is the same.

However, the pressure of System B is much higher than that of System A. Pressure is defined as the force exerted per unit area, and in a gas, it is a result of the collisions of gas particles with each other and with the walls of the container.

The higher pressure in System B indicates that there are more collisions occurring per unit area, which means that there is a greater amount of energy being transferred between the particles.

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Answer:

3.the distance away from the sun where it to hot or too cold for life to exist

Answer:

a.

445 nm : 4.45 x 10^-19 J

445 nm : 2.78 eV

586 nm : 3.38 x 10^-19 J

586 nm : 2.11 eV

667 nm : 2.99 x 10^-19 J

667 nm : 1.87 eV

b.

E3 to E1 : ΔE = 1.87 eV

E3 to E2 : ΔE = 0.24 eV

E2 to E1 : ΔE = 0.24 eV

Explanation:

a) To calculate the energies of the emitted photons, we can use the formula:

E = hc/λ

where E is the energy of the photon in Joules, h is Planck's constant (6.626 x 10^-34 J s), c is the speed of light (3.00 x 10^8 m/s), and λ is the wavelength of the photon in meters.

For the first line of wavelength 445 nm:

E = hc/λ = (6.626 x 10^-34 J s)(3.00 x 10^8 m/s)/(445 x 10^-9 m) = 4.45 x 10^-19 J

To convert this to electron volts (eV), we can use the conversion factor 1 eV = 1.602 x 10^-19 J:

E = 4.45 x 10^-19 J/(1.602 x 10^-19 J/eV) = 2.78 eV

For the second line of wavelength 586 nm:

E = hc/λ = (6.626 x 10^-34 J s)(3.00 x 10^8 m/s)/(586 x 10^-9 m) = 3.38 x 10^-19 J

E = 3.38 x 10^-19 J/(1.602 x 10^-19 J/eV) = 2.11 eV

For the third line of wavelength 667 nm:

E = hc/λ = (6.626 x 10^-34 J s)(3.00 x 10^8 m/s)/(667 x 10^-9 m) = 2.99 x 10^-19 J

E = 2.99 x 10^-19 J/(1.602 x 10^-19 J/eV) = 1.87 eV

b) The energy level diagram for an atom of the element which has produced these photons can be drawn as follows:

markdown

     E3

     |

     | ΔE = 1.87 eV

     |

     |

     |

     E2

     |

     | ΔE = 0.24 eV

     |

     |

     |

     E1

The electron transitions which have given rise to the three spectral lines are:

The transition from energy level E3 to E1, which produces the photon of wavelength 445 nm and energy 2.78 eV (ΔE = 1.87 eV).

The transition from energy level E3 to E2, which produces the photon of wavelength 586 nm and energy 2.11 eV (ΔE = 0.24 eV).

The transition from energy level E2 to E1, which produces the photon of wavelength 667 nm and energy 1.87 eV (ΔE = 0.24 eV).

Note that this energy level diagram is just one possible arrangement of energy levels that could produce the observed spectral lines. There may be other possible arrangements of energy levels that could also explain the observed lines.

ChatGPT

Answer: Fn

Explanation: Because Fn is applying force upward

Since we have a 14 gallon tank this means that in total we need:

cubic inches.

Now, we know that one inche is equal to 2.54 cm then we have that:

finally, and since a liter is equal to 1000 cubic centimeters we have that:

Therefore we need 54.99576 liters of gasoline (this is approximately 55 liters)

Answer:

a

Explanation:

Answer:

a

Explanation:

because it's need someone moving it so it can move somewhere else

The equation mentioned in the manual is:

m = (n2/n1) * (cos(theta1)/cos(theta2))

n1 = 2.42

The equation mentioned in the manual is:

m = (n2/n1) * (cos(theta1)/cos(theta2))

where m is the slope obtained from the graph of sin(theta1) vs. sin(theta2), n1 and n2 are the refractive indices of the two materials, and theta1 and theta2 are the angles of incidence and refraction, respectively.

In this problem, we have n2 = 1.0003 (since the second material is air). We also know that sin(theta1) = sin(theta2), since the graph is of sin(theta1) vs. sin(theta2). Therefore, cos(theta1) = sqrt(1-sin^2(theta1)) = sqrt(1-sin^2(theta2)) = cos(theta2).

Substituting these values into the equation above, we get:

0.413 = (1.0003/n1) * 1

Simplifying this expression, we get:

n1 = 1.0003/0.413 = 2.42

Therefore, the correct answer is n1 = 2.42.

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Answer:

330 meters per second

Explanation:

Δx = vt

660 = 2v

Divide both sides by 2 to get 330 = v

Answer:

Explanation:

The first question utilizes the one-dimensional equation

Δx = \(v_0t+\frac{1}{2}at^2\) where Δx is the displacement of the bullet, v₀ is te initial velocity with which the bullet was fired, a is the acceleration in the horizontal dimension (which is always 0!), and t is the time in seconds. That's our unknown here. Filling in:

\(200.0=660t+\frac{1}{2}(0)t^2\) and

200.0 = 660t so

t = .30 seconds

The second question is a simple application of Newton's 2nd Law which says force = mass times acceleration:

14000 = m(5.0) so

2800 kg = m

The third question is a bit more interesting. We will use the one-dimensional equation

\(v=v_0+at\) where v is the final velocity of the ball (which is always 0 at the top of its projectile path!), v₀ is the initial velocity of the ball, a is the pull of gravity on the ball, and t is the time it takes to do this. Filling in:

0 = 30 + (-9.8)t and

-30 = -9.8t so

t = 3.1 seconds

Answer:

It means that the frequency will be a lot higher with a shorter wave.

Answer:

his results in the final angle after the collision of 37.2 degrees basically what we did there is turn the vector into a right triangle. We use sohcahtoa to solve for the angle. Being.

Explanation:

Answer:

As altitude increases and atmospheric pressure decreases, the boiling point of water decreases.

Answer:

B

Explanation:

B, because if u subtract the forces from each other the forward one outweights the other ones

Answer:

C. The car is moving at a constant speed.

Answer:

Distance, S = 15m

Explanation:

Given the following data;

Mass = 4kg

Force = 10N

Initial velocity = 5m/s

Final velocity = 10m/s

To find the distance;

First of all, we would calculate the acceleration

Force = mass * acceleration

10 = 4*acceleration

Acceleration = 10/4

Acceleration = 2.5m/s²

Now to find the distance, we would use the third equation of motion.

\( V^{2} = U^{2} + 2aS \)

Where;

S represents the displacement measured in meters.

Substituting into the equation, we have;

10² = 5² + 2*2.5*S

100 = 25 + 5S

5S = 100 - 25

5S = 75

Distance, S = 75/5

Distance, S = 15m

Answer:

3. 1.8A

Explanation:

Given the following data;

Quantity of charge, Q = 650C

Time = 6 minutes to seconds = 6 * 60 = 360 seconds.

To find the current l;

Quantity of charge = current * time

Substituting into the equation, we have;

650 = current * 360

Current = 650/360

Current = 1.8 Amperes

3.24 x \(10^{-2}\) N is the force acting on each charge.

We can use Coulomb's law to determine the magnitude and direction of the force on each charge. Coulomb's law states that the force between two charges is proportional to the product of the charges and inversely proportional to the square of the distance between them.

Let's assume that we are calculating the force on one of the charges located at a corner of the square. The distance between two adjacent charges is 0.1m, and the charge on each corner is 6.00mc, which is 6.00 x \(10^{-6}\) C.

Using Coulomb's law, we can calculate the magnitude of the force on one charge as:

F = kq₁q₂/r²

where k is the Coulomb constant (9 x \(10^{9}\) N m²/C²), q₁and q₂ are the charges, and r is the distance between the charges.

If we plug in the values, we get:

F = (9 x \(10^{9}\) N m²/C²) * (6.00 x\(10^{-6}\) C)² / (0.1m)²

F = 3.24 x \(10^{-2}\) N

So the magnitude of the force on each charge is 3.24 x \(10^{-2}\) N, and the direction of the force is towards the other charges located at the corners of the square. Since the charges are all the same, the direction of the force will be towards the center of the square.

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Answer:

In these reactions the products are higher in energy than the reactants. ... This barrier is due to the fact that to make CO2 and H2O we have to break 4 carbon-hydrogen bonds and some ...

Explanation:

The first gear set (12-72) provides a speed increase of 6, and the second gear set (8-64) further increases the speed by a factor of 8, resulting in an overall speed increase of 48.

To design a compounded reverted gear train as a step-up gear with a speed increase of 48 times while minimizing the gearbox size and avoiding interference problems, we need to carefully select the numbers of teeth for the gears.

The compounded reverted gear train consists of two sets of gears: the first set is the compound gear train, and the second set is the reverted gear train. The compound gear train is used to achieve a moderate speed increase, and the reverted gear train further amplifies the speed.

To determine suitable numbers of teeth, we can start by considering the speed increase ratio of 48. This ratio can be achieved by breaking it down into smaller ratios for the compound and reverted gear sets. For example, we can choose a speed increase ratio of 6 in the compound gear train and a ratio of 8 in the reverted gear train.

Next, we need to select suitable numbers of teeth for each gear to avoid interference problems and ensure smooth operation. To minimize gearbox size, we aim to keep the gears as small as possible. One approach is to use gears with a small number of teeth, which can help reduce their size.

For the compound gear train, we can select gears with, for example, 12 and 72 teeth. This gives a speed increase ratio of 6. For the reverted gear train, we can choose gears with 8 and 64 teeth, resulting in a speed increase ratio of 8.

The sketch of the designed compounded reverted gear system would show the gear positions and their numbers of teeth as follows:

     ----    12 teeth    ----

   /                              \

--- 72 teeth 8 teeth ---

\ /

      ---- 64 teeth ----

In this configuration, the first gear set (12-72) provides a speed increase of 6, and the second gear set (8-64) further increases the speed by a factor of 8, resulting in an overall speed increase of 48. By carefully selecting the numbers of teeth and the gear ratios, we can achieve the desired speed increase while minimizing the size of the gearbox and avoiding interference problems between the gear teeth.

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