Which provides evidence of universe expansion that supports the Big Bang Theory? Select the three correct answers. (2 points)
An enormous amount of weak background radiation has been detected in the universe.
The temperature of the universe is decreasing.
The temperature of Cosmic Microwave Background radiation varies widely from one part of the universe to another
Galaxies are moving away from each other.
The universe is undergoing a cycle of contraction and expansion
The temperature of the universe is increasing.

Answer:

Net flux through the surface is zero.

Explanation:

Recall that the net electric flux through a closed surface depends on the net charge enclosed inside that surface.

In our case, there are two point charges of exactly opposite charge (net charge - zero), which are located inside the Gaussian surface of radius "2 a" centered at the origin - both charges are located at a distance "a" from the origin of coordinates, therefore inside the Gaussian surface.

Then the net flux through the surface is also ZERO.

Answer: The wavelength and frequency of light are closely related. The higher the frequency, the shorter the wavelength. Because all light waves move through a vacuum at the same speed, the number of wave crests passing by a given point in one second depends on the wavelength.

Explanation:

To solve this problem, we can apply the principle of conservation of momentum, which states that the total momentum before an event is equal to the total momentum after the event, assuming no external forces are acting on the system.

Let's denote the velocity of the lighter cart as v1 (0.41 m/s) and the velocity of the other cart (heavier cart) as v2 (unknown).

The initial momentum of the system is zero since both carts are initially at rest. Therefore, the final momentum of the system must also be zero for momentum to be conserved.

The momentum of an object is given by the product of its mass and velocity:

Momentum = mass * velocity

The momentum of the lighter cart (m1) is:

m1 * v1 = (0.57 kg) * (0.41 m/s)

The momentum of the heavier cart (m2) is:

m2 * v2 = (0.76 kg) * v2

Since momentum is conserved, the sum of the momenta before the event should equal the sum of the momenta after the event:

m1 * v1 + m2 * v2 = 0

Substituting the given values:

(0.57 kg) * (0.41 m/s) + (0.76 kg) * v2 = 0

Now we can solve for v2:

(0.57 kg * 0.41 m/s) + (0.76 kg * v2) = 0

0.2337 kg·m/s + (0.76 kg * v2) = 0

0.76 kg * v2 = -0.2337 kg·m/s

v2 = -0.2337 kg·m/s / 0.76 kg

v2 ≈ -0.307 m/s

Therefore, the velocity of the other cart (heavier cart) after the spring is released is approximately -0.307 m/s. The negative sign indicates that the cart is moving in the opposite direction to the positive direction chosen for the lighter cart.

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The rotational inertia of the assembly decreases by 14.9% when the innermost particle is removed and 49.2% when the outermost particle is removed.

The rotational inertia of an assembly is calculated by the sum of each particle's moment of inertia, which is calculated by its mass multiplied by the square of its distance from the axis of rotation. When one particle is removed from the assembly, the rotational inertia decreases by a percentage equal to the amount of mass removed multiplied by the square of the distance of that particle from the axis of rotation.

For the innermost particle, since it is closest to the axis of rotation, its removal will cause the greatest decrease in rotational inertia. The percentage decrease in rotational inertia when the innermost particle is removed would be 33% x (0.0121 kg x (3.045 cm)2) / (0.0363 kg x (6.09 cm)2) = 14.9%.

For the outermost particle, since it is farthest from the axis of rotation, its removal will cause the smallest decrease in rotational inertia. The percentage decrease in rotational inertia when the outermost particle is removed would be 33% x (0.0121 kg x (9.135 cm)2) / (0.0363 kg x (6.09 cm)2) = 49.2%.

In summary, the rotational inertia of the assembly decreases by 14.9% when the innermost particle is removed and 49.2% when the outermost particle is removed.

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Answer: I think it's C.

Explanation:2D is only one side and 3D has length width and height

Answer:

3d

Explanation:

The accidental discovery of the CMB in 1965 by American radio astronomers Arno Penzias and Robert Wilson was the culmination of work initiated in the 1940s, and earned the discoverers the 1978 Nobel Prize in Physics

What did Arno Penzias and Robert Wilson discover?

However, when Arno Penzias and Robert Wilson studied cosmic radiation in 1964, they discovered that microwaves with a wavelength of about 7 centimeters were stronger than expected.

How was the discovery of CMB evidence for Big Bang?

Their detection of the Cosmic Microwave Background (CMB), the radiation left over from the birth of the universe, provided the strongest possible evidence that the universe expanded from an initial violent explosion, known as The Big Bang.

What did COBE discover?

COBE revolutionized our understanding of the early cosmos. It precisely measured and mapped the oldest light in the universe -- the cosmic microwave background. The cosmic microwave background spectrum was measured with a precision of 0.005%. The results confirmed the Big Bang theory of the origin of the universe.

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Answer:

Explanation:

log10 function is required to convert dB into intensity of a sound. Both are measures of loudness of a sound and the relationship can be expressed as follows:

dB = 10 log10(I/Io), where Io is 10^-12 W/m^2

Substituting, 82 = 10 log10(I/10^-12)

I = 0.0001585 W/m^2

or 1.58*10^-4 W/m^2

Answer:

Explanation:

82dB = 10log(Intensity/10^-12)

Intensity = 10^-12*10^(82/10)

=10^(-3.8)

=1.585*10^-4 W/m2

The acceleration of the motor bike is 4 m/s².

To find the acceleration, the given values are,

Final velocity = 60 m/s

Initial velocity = 0 m/s

Time period = 15 seconds.

                     a = (vf - vi) / t m/s²

Acceleration  =  (change in speed) / (time for the change)

a = acceleration

vf = final velocity

vi= starting velocity

t  =  time

So the formula,

           a = Δv / t m/s²  

              =  (60 m/s)  /  (15)        

              = 4 m/s².

The acceleration of the motor bike is 4 m/s².

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Sure, I can help you with that! To start, we need to know the formula for calculating the current gain β of an NPN transistor:

β = IC / IB

where IC is the collector current and IB is the base current. We also know that α = 0.9934, which is the current gain due to the transistor's internal construction.

a) To calculate β, we can use the formula and the given values:

β = IC / IB
β = α / (1 - α) * IB
β = 0.9934 / (1 - 0.9934) * 25μA
β ≈ 375.67

Therefore, the current gain β is approximately 375.67.

b) To calculate the collector current IC, we can use the formula:

IC = β * IB
IC = 375.67 * 25μA
IC ≈ 9.39mA

Therefore, the collector current IC is approximately 9.39mA.

c) To calculate the emitter current IE, we can use Kirchhoff's current law, which states that the sum of the currents entering a junction is equal to the sum of the currents leaving the junction:

IE = IC + IB
IE = 9.39mA + 25μA
IE ≈ 9.41mA

Therefore, the emitter current IE is approximately 9.41mA.

I hope that helps! Let me know if you have any other questions.

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When Lorraine puts the tennis ball in the container of olive oil, it will float on the surface of the oil because the density of the tennis ball (970 kg/m³) is less than the density of the olive oil (900 kg/m³).

Density is a measure of the mass of a substance per unit volume. It is an important physical property of matter and is used to identify substances, compare the same substances in different states, and measure the concentration of substances in solutions. Density is expressed in terms of grams per cubic centimeter or pounds per cubic foot. Density is also a fundamental concept in the study of fluid mechanics, since the density of a fluid determines its pressure and its behavior when acted upon by external forces.

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A flexible schedule may be most appropriate when the site conditions are subject to delays caused by weather or differing site conditions.

This type of schedule allows for adjustments to be made as needed, in order to accommodate unforeseen circumstances and keep the project on track. It is important to account for potential delays and obstacles when planning a construction project.

A flexible schedule can help mitigate the impact of these factors on the timeline. A flexible schedule may be most appropriate when the site conditions are subject to delays caused by weather, and differing site conditions. This type of schedule can help accommodate unexpected changes and keep the project on track.

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Answer: yes

Explanation: Having a higher metabolism can help you lose weight and keep it off, while also giving you more energy.

The magnitude of the angular momentum of the two-satellite system is best represented as, L=m₁v₁r₁-m₂v₂r₂.

The rotational analog of linear momentum is angular momentum also known as moment of momentum or rotational momentum.

It is significant in physics because it is a conserved quantity. the total angular momentum of a closed system remains constant. Both the direction and magnitude of angular momentum are conserved.

The magnitude of the angular momentum of the two-satellite system is best represented as;

L=∑mvr

L=m₁v₁r₁-m₂v₂r₂

Hence, the magnitude of the angular momentum of the two-satellite system is best represented as, L=m₁v₁r₁-m₂v₂r₂.

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Answer:

c

Explanation:

force is how hard it is pulled or pushed

Answer:

flooding

Explanation:

Answer:

atoms and molecules

Explanation:

as opposed to being continuous or just including particles). On the following page, the idea is stated as one of four concepts in Dalton's theory: “All matter is composed of tiny, indivisible particles called atoms”

Answer: atoms

Matter is made of atoms, the basic building blocks. Atoms are made of protons, neutrons and electrons. The answer is atoms.

Hope it helps!

31250 kg m/sec was the initial momentum of the truck.

Momentum is the amount of motion of a moving body, calculated as the product of both the object's velocity and mass.

Given that,

The mass of the truck is 1250 kg with a velocity of 25 m/sec

The mass of the car is 625 kg moving with a velocity of 30 m/sec

The initial momentum of truck is = ?

The mass of the truck = 1250 kg

The velocity of the truck = 25 m/sec

The mass of the car = 625 kg

The velocity of the car = 30 m/sec

(i) The initial momentum of the truck is:

= m₁v₁

= 1250 × 25

= 31250 kg. m/sec

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Answer:

B

Explanation:

the external force was applied

Answer

the answer is 6.25

Explanation:

Here, the mass of the stone (m) = 0.5 kg, velocity at which it is thrown (v) = 5 m/s, The kinetic energy of the stone (KE) =? We have, Kinetic energy of the stone (KE) = \ (\frac12mv^21) = \(\frac120.5\times5^2\) = 6.25 Joules Hence, the kinetic energy of the stone (KE) is 6.25 joules. Hope it will be helpful

Answer:

B -- a single electron or one of two or more electrons in the outer shell of an atom that is responsible for the chemical properties of the atom.

Explanation:

Hope this helps! Please let me know if you need more help or think my answer is incorrect. Brainliest would be MUCH appreciated. Have a wonderful day!

The electrons in the outermost shell available for bonding are known as valence electrons. Therefore, option (B) is correct.

Valence electrons can be described as the electrons occupying the valence shell or outermost shell of an atom while the electrons filled in the inner shell are known as core electrons. Lewis structures can be helpful to evaluate the valence electrons and know the nature of bonds.

Valence electrons can be filled in several electron shells and these electrons participate in the interaction between atoms and lead to the formation of bonds.

Only electrons filled in the outermost or valence shell can participate in the formation of a chemical bond and set the trend of the reactivity of the element. Valence electrons participate in bonding to achieve the noble gas configuration.

Therefore, valence electrons are the electrons in the outermost shell available for bonding.

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The reflected rays of light don't produce visible colored interference fringes in a window pane because the glass structure of a window pane prevents the interference patterns to be observed.

A window pane is the glass that acts as a window in a building. While usually a window pane is only composed of a single piece of glass, sometimes two or more glass sheets are used with some space between each.

When it strikes a window pane, some rays will be reflected back and forth between the glass surfaces. Theoretically, it should produce some visible colored interference fringes. However, the glass structures in window panes do not have the ability to produce these visible fringes. They do produce the effect, but they are negated by the effect of other sections of the glass.

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Answer:

scalar Besause it has magnitude but no direction

Answer:

Having begun as a "science of mental life", psychology evolved in the 1920's into the "scientific study of observable behavior". ... Today's science emphasizes the interaction of genes and experiences in specific environment

Answer:

Psychology continues to develop over the years all the way up to today by new and better scientific like science emphasizes. Also new experiences in specifics enviroment.

Explanation:

Hope it helped :)

Answer:

The new Coulomb force is q₁q₂/9πε₀r²

Explanation

The coulomb force between the two charges q₁ and q₂ at a distance r in air is given by F = q₁q₂/4πε₀r².

Now, let us assume the material of dielectric constant κ = 9 is placed between them on the side of the q₁ charge. The value of its effective charge is now q₃ = q₁/κ at a distance of d = r/2 from the q₂ charge.

Since we have air between q₂ and q₃, the coulomb force between them is

F' = q₂q₃/4πε₀d²

= q₂(q₁/κ)/4πε₀(r/2)²

=  4q₂q₁/κ4πε₀r²

= 4/κ(q₂q₁/4πε₀r²)

= 4/9 × (q₂q₁/4πε₀r²)

= q₁q₂/9πε₀r²

So, the new Coulomb force is q₁q₂/9πε₀r²

Answer:

FG and FP

Explanation:

Gravitational Force(FG) because the box is being pulled down and a resistance force pushing up because he is pushing(FP) up on the box.

I hope this helps!

Magnetic fields and electric fields are similar on the basis of the forces and its application.

An electric field is an electric property that is connected with any location in space where a charge exists in any form. The electric force per unit charge is another term for an electric field.

Magnetic and electric fields have certain similarities, are as follows;

1. Both the electric force and magnetic forces are the non-contact forces.

2. Both acts between the two entity having certain mass.

3. Both have their respective ranges.

Hence, magnetic fields and electric fields are similar on the basis of the forces and its application.

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Answer:

If the amplitude increases the volume increases and vice versa.So therefor the volume depends on how high or low the amplitude is.

When two or more sound waves occupy the same space, they affect one another. The waves do not bounce off of each, but they move through each other. The resulting wave depends on how the waves line up.

With constructive interference, two waves with the same frequency and amplitude line up – the peaks line up with peaks and troughs with troughs as in diagram A above. The result is a wave that has twice the amplitude of the original waves so the sound wave will be twice as loud.

Answer:

The required time is 750 s.

Explanation:

The velocity of the man gets slowed by 2.0 m/s when the wind is blowing.

Therefore the speed of the man on the day of wind is (4.0-2.0)=2.0 m/s.

The time, speed and distance are related by the equation,

t=v/d

Given v= 2 m/s and d=1500 m.

The required time is,

t=1500/2

t=750 s

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