how is science controlled by the governerment

Answer:

10. B. 30 kg.m/s

16. B. Elastic collision

20. Velocity

Explanation:

10. Momentum is simply the product of mass and velocity of an object. So it can be soved with the equation:

p = mv

Where:

p = momentum (kg.m/s)

m = mass (kg)

v = velocity (m/s)

Your problem gives you the following:

m = 15 kg

v = 2 m/s

p =?

So just fill in what you know:

p = mv

p = (15kg)(2m/s) = 30 kg.m/s

16. Elastic collision occurs when two objects collide and no loss in energy occurs after collision. Supposing that the balls are very bouncy, let's say they bumped into each other and they bounce-off of each other. If there is no loss in speed on both ends, that means that this is an elastic collision.

20. To differentiate vector and scalar quantity, just remember that vectors have direction. Both quanitites show magnitude, but vector quantities indicate the direction the magnitude is going. Among all the choices, it is only velocity that is considered as a VECTOR quantity.

Answer:

Charge on each is 2 x 10⁻¹⁰.

Explanation:

We know that Force between two point charges is given b the Coulomb's law as:

F = kq₁q₂/r^2

k = 9 x 10^9

r = 3.00 cm

= 0.03 m

q₁ = q₂

F = 4.00 x 10^-7

Rearranging the formula, we get:

F = k q²/r²

q² = Fr²/k

q² = 4 x 10⁻⁷ x 0.03²/(9x10⁹)

q² = 4 x 10⁻²⁰

q = 2 x 10⁻¹⁰

As there is force of repulsion between the charges, the charges must be both positive or both negative.

Answer:

China, US, India, and Russia

Answer:

Answer is C.

Explanation:

To calculate the IMA for a wheel and axle, find the ratio of the larger radius to the smaller radius:

IMA = R/r

IMA = 9/3

IMA = 3

It says that the force of a spring is always opposite to the direction in which you stretch it or compress it. (the direction of 'x')

In other words, a spring that's disturbed always tries to put itself back to it's normal length, where x would be zero.

Answer:

The answer would be C.

The correct answer is C. Allow water to flow away from the tire. Tread patterns improve handling, traction, and performance. Wet conditions are drained by the tread design. To prevent hydroplaning, this channels water.

Let water drain from the tyre. On wet roads, a tire's tread pattern improves traction and safety. Water is dispersed away from the tire's contact patch by tread grooves and channels. Hydroplaning prevention is this. Water can prevent traction and cause sliding on wet roads. Water is evacuated through the tread pattern's channels, retaining road contact and grip. For road safety and performance in all weather situations, the tread pattern delivers traction on dry roads and superior handling.

The tread pattern on a tire serves several purposes, including providing traction on different road surfaces, improving handling, and enhancing the tire's performance in various weather conditions. One essential function of the tread pattern is to allow water to flow away from the tire's contact patch during wet conditions. This helps prevent hydroplaning by channeling water away and maintaining proper contact between the tire and the road, ensuring better grip and safety.

To know more about hydroplaning

https://brainly.com/question/13875343

#SPJ2

Answer:

Newton gives us force

F=-G*M*m/R^2

Divide by the mass of the object to get acceleration

a=F/m = GM/R^2

You are solving the distance where the force from the moon equals the force from the Earth -

a= G*(mass of earth)/R^2 - G*(mass of moon)/(384400000-R)^2=0

Or in other words

G*(mass of earth)/R^2=G*(mass of moon)/(384400000-R)^2

Divide by G*(mass of the moon) and multiply by R^2 to get terms on both sides

G*(mass of earth)/(G*(mass of moon))=R^2/(384400000-R)^2

Since the mass of the moon and earth are fixed, the left side is a number

81.3 = R^2/(384400000-R)^2 → R^2/(384400000-R)^2–81.3 = 0

simplify

R/(384400000-R) = 9.01665

R=346024000 = 346,024 km.

Explanation:

Answer:

=1.667 A

Explanation:

For resistors connected in series, the same current flows trough all the resistors.

Therefore, V= IR (total)

V is the voltage of the supply, I the current through the circuit and R(total) the total resistance calculated calculated by adding the resistance of all the appliances in the circuit.

R (total) = 30+20+10= 60Ω as the value E can be replaced with Ω

V=IR

I=V/R

=100 V/ 60Ω

=1.667 A

Answer:

1.7A is the answer

Explanation:

Answer:

Liquids are more dense than gases, but less dense than solids, so sound travels 2nd fast in liquids. Gases are the slowest because they are the least dense.

Explanation: The more dense something is, the faster sound will travel through the matter. I hope this was the answer you was looking for.

Final answer:

Sound travels faster in mediums that are denser and more rigid, with solids being faster than liquids, which in turn are faster than gases. The closer particle arrangement in solids and liquids allows more efficient energy transfer. Temperature and air pressure also influence sound speed, with higher values generally leading to faster sound travel.

Explanation:

The speed of sound is influenced by the medium it travels through due to differences in density and rigidity. In solids, particles are packed together more closely compared to liquids, and in liquids, they are closer than in gases. This proximity allows for quicker transfer of sound energy from particle to particle. Sound waves travel faster in solids than in liquids because solids are more rigid and less compressible, and faster in liquids than in gases for similar reasons. In addition to rigidity and density, temperature also affects the speed of sound. Higher temperatures increase particle movement, thus enhancing sound transmission. The speed of sound is greater at sea level due to higher air pressure, which decreases the compressibility of air and allows sound to travel through it more quickly.

" 1.8 Ampere " means "1.8 Coulomb/sec".

(2.5 C)/(1.8 C/sec) = (2.5/1.8) (s) = 1.39 sec

I honestly don't see where any of the choices comes from, but the closest one is (C) 1.45 sec.

Answer:

1.4 seconds, which is the third option

Explanation:

Current is defined as the flow of charge per time

Therefore, the equation that relates current, charge and time can be expressed as follows:

I = ΔQ / ΔT

where:

I is the current given = 1.8 ampere

ΔQ is the charge given = 2.5 coulomb

Δt is the time required for the flow of the given charges to give the 1.8 ampere.

Substitute with the givens in the above equation to get the time as follows:

1.8 = 2.5 / ΔT

ΔT = 2.5 / 1.8 = 1.38888 which is approximately 1.4 seconds

Answer:

Explanation:

The conversion of water into steam involves various factors and changes.

When heat is applied to water, the bond between the molecules start to loosen up and molecules starts separating hence it from changes from liquid to gas or steam.

At this time molecules have greater kinetic energy which is given to them in form of heat. Hence apart from all options given, D is the correct one which states that :

"When water changes to steam bonds between molecules break apart. After reaching the boiling point, energy is used to change bond strength and change the kinetic energy of the atoms."

Answer:

When water turns to steam,

D) the water absorbs energy which causes the water molecules to have more kinetic and potential energy changing their configuration from a liquid to a gas.

Answer:

Asher cycles 12 miles in 16 hours. What is his speed?

Speed is a rate of distance to time.

Asher’s speed is 12 miles per 16 hours.

As a unit rate, his speed is 0.75.

Explanation:

just took quiz

Answer:

f = 6.912 E14 Hz

Explanation:

The speed of the wave is defined as

speed = wavelength*frequency

the frequency of the photon  is defined as

f = speed / wavelength

f = 3 E8 m/s / 434 E-9 m

f = 6.912 E14 Hz

Answer:

B

Explanation:

The image that illustrates refraction in the question above  is : ( B ) Image B

Refraction is the change in direction of wave passing through a medium due to change in speed of the traveling wave. The first image  represents a reflection as the wave does not pass through the medium but bounces off the medium.

The second image shows that the wave passes through the medium but changes its direction,  therefore it represents refraction.

Hence, we conclude that the image that illustrates refraction in the question above  is : ( B ) Image B

Learn more about refraction : https://brainly.com/question/1360744

#SPJ2

Answer:

Mental map

Explanation:

A mental map is a person's point-of-view perception of their area of interaction.

This is a short answer, but I Hope this helps!

- Kylie

Answer:

Mental map is the correct answer.

Explanation:

If you imagine how to walk from your house to the bus stop, you are using a:​ Mental map.

Answer:A

Explanation:

Answer:

Minimum amount

Explanation:

There's no way for me to really explain it well but its the correct a p e .x answer

Answer:

An idea, event, or object can be represented by a 'model' to help people better understand it.

Explanation:

If an idea, event or object is to be represented or introduced to an individual or a group of people, a good idea is to represent it with a model.

The reason behind it being that a model will help the people understand it better as they will be able to see something in front of it and know what is being discussed.

A symbol is used to represent an idea, event, or object, to convey complex ideas and emotions with cultural significance. Symbolism allows for effective communication by providing a shorthand that encapsulates a variety of meanings within recognizable forms.

An idea, event, or object can be represented by a symbol to help people better understand it. Symbolism is the practice of using symbols such as gestures, signs, objects, signals, and words to convey complex ideas and emotions that are recognized shared meanings within a society. For example, the United States' flag might be just a piece of colored cloth, but it can represent a multitude of ideas from freedom and sacrifice to oppression, depending on one's perspective and cultural context.

Creating symbols can be a form of shorthand communication, offering a powerful way to express complex ideas without lengthy explanations. When writing, one might use imagery to evoke a sensory experience of an event or moment, thereby enriching the storytelling with deeper meaning. Symbols thus serve as cultural aggregates which crystallize a variety of emotions and concepts in a universally understandable way.

In some cases, models can serve as symbolic representations, such as equations, physical representations, or computer simulations which abstractly represent aspects of reality to convey understanding to others. Similarly, an analogy can be employed to make complex subjects more relatable by comparing them to familiar experiences or objects, ensuring effective communication with the audience.

https://brainly.com/question/3200799

#SPJ6

your answer would be 27.

The ratio of kinetic energy of ball A to ball B is 27

Answer: Option D

Explanation:

The kinetic energy of any object is the energy exhibited by the object when it is in motion. The kinetic energy of any object is directly proportional to the mass of the object and square of the speed at which the object is moving. So the kinetic energy of any object can be represented as

                 [tex]E_{k}=\frac{1}{2} \times m \times(\text { speed })^{2}[/tex]

In this case, for ball B the mass is 1 kg and speed is 1 m/s. So the kinetic energy of ball B is

            [tex]\text { Kinetic energy for ball } B=\frac{1}{2} \times 1 \times 1^{2}=0.5 J[/tex]

As it is said that the mass (M) and speed of ball A is three times the mass and speed of ball B.  So ,

         [tex]\text { M of ball } A=3 \times M \text { of ball } B=3 \times 1=3 \mathrm{kg}[/tex]

And,

           [tex]\text { Speed of ball } A=3 \times \text { Speed of ball } B=3 \times 1=3 \mathrm{m} / \mathrm{s}[/tex]

Thus, the kinetic energy of ball A will be

            [tex]\text {Kinetic energy for ball } A=\frac{1}{2} \times 3 \times 9=13.5 \mathrm{J}[/tex]

Now, to determine the ratio of kinetic energy of ball A to ball B,

[tex]\text { Ratio of kinetic energy }=\frac{\text {Kinetic energy of Ball } A}{\text {Kinetic energy of Ball } B}=\frac{13.5}{0.5} = 27[/tex]

Answer:

I. Electromagnetic waves

Explanation:

Answer:

I. Electromagnetic waves

Explanation:

Average speed = (distance rolled) / (time to roll the distance)

Average speed = (32 meters) / (0.8 sec)

Average speed = (32/0.8) (meters/sec)

Average speed = 40 m/s .

I don't know.  That's just a hair under 90 miles per hour.  Is this reasonable for a bowling ball ?  Does anybody roll a bowling ball as fast as a major league pitcher pitches a hardball ? ?

Answer:

Option C

Explanation:

We have to check range of all options first

For A:

Largest Value: 5

Smallest Value: 1

So range = Largest value - smallest value

5-1 = 4

For B:

Largest Value: 6

Smallest Value: 4

Range = 6-4 = 2

For C:

Largest Value: 9

Smallest Value: 1

Range = 9-1 = 8

For D:

Largest Value = 9

Smallest Value = 3

Range = 9-3=6

So, the data set in option C has the largest range

Answer:

m

≈

3.878

Kg

Explanation:

By Newton's second law,

F  = m a

So, W = m g

 m = W /g

m=32/ 8.25  Kg or 3.878  Kg (approx)

Nuclear energy is produced through controlled nuclear fission in reactors, where large uranium nuclei are split by neutrons, releasing energy to convert water to steam that turns turbines and generates electricity. Fission and fusion are two different processes that release energy from the nucleus of an atom. The entire process is meticulously controlled to provide a sustainable and powerful source of energy.

Nuclear energy is produced through the processes of nuclear fission or fusion. In a nuclear power plant, uranium is used in fuel rods, where its atoms are split apart by neutrons. When uranium nuclei split, they release energy, radiation, and more neutrons. This results in a controlled chain reaction. The energy released during this process is used to heat water, which then turns into steam. The steam drives a turbine connected to a generator, thus producing electricity.

There is a crucial difference in the types of nuclear reactions used for energy. In fission, large uranium nuclei absorb neutrons and break down into smaller nuclei, releasing a significant amount of energy. In fusion, which is not yet commercially viable, smaller nuclei are forced together to form larger nuclei, which also releases energy.

It's important to control the speed of the fission reaction to sustain the chain reaction for energy production and to prevent uncontrolled energy releases like those in atomic bombs. Natural uranium must first be enriched with uranium-235 to be effective in reactors. On the other hand, scientists continue to research how to achieve controlled fusion, which also has the potential to provide significant amounts of energy.

η = 13.8 lm/W. The luminous efficacy of a incandescent lightbulb that produces 830 lumens and consumed a power of 60 W is 13.8 lm/W.

The luminous efficacy of a light source is the relationship between the luminous flux (in lumens) emitted by a light source and the power (in watts). The luminous efficacy of a light source or luminous efficiency measures the part of electrical energy that is used to illuminate and is obtained by dividing the luminous flux emitted by the electrical power consumed. Luminous efficiency is expressed in lumens per watt (lm / W). It is given by the relation:

η = F / P.  Where F is the luminous flux, and P is the power consumed by the light source.

The efficacy of a 60.0 W incandescent lightbulb that produces 830 lm is:

η = 830 lm / 60 W

η = 13.8 lm/W

If a substance absorbs energy but its temperature does not change, then the internal potential energy is changing.

Answer:

If a substance absorbs energy but its temperature does not change, then the internal potential energy is changing.

Explanation:

I just did this question on the same lesson.

Ampere's Law states that for any closed loop path, the sum of the length elements times the magnetic field in the direction of the length element is equal to the permeability times the electric current enclosed in the loop.

Ampere's Law states that the line integral of the magnetic field around an electric current is proportional to the current, helping in calculating the magnetic field generated by current-carrying wires.

Ampere's Law is a fundamental physical law in electromagnetism, stating that the line integral of the magnetic field (B) around an electric current is proportional to the current (I). This means that for any closed loop, the sum of the magnetic field dot products along the loop is equal to the permeability constant (µ₀) times the current passing through the loop. Mathematically, Ampere's Law is expressed as ∫ B ⋅ dl = μ₀I, where B is the magnetic field, dl is a differential element of the loop C, and μ₀ is the magnetic constant.

Ampere's law helps in determining the magnetic field generated by complex configurations of electric current by breaking it down into segments, each producing a magnetic field as if it was from a long straight wire. The resultant magnetic field is the vector sum of the fields due to each of these segments.

Answer:

The correct answer is option D.

Explanation:

From the given options the reaction which is not a double replacement reaction is:

[tex]Zn (s) + 2HCl (aq)\rightarrow H_2 (g) + ZnCl_2 (s)[/tex]

This because the above reaction is an example of single replacement reaction.

[tex]AB+C\rightarrow AC+B[/tex]

Whereas;

Double replacement reaction is a type of chemical reaction in which exchange of ions among the reactants take place.

[tex]AB+CD\rightarrow AD+CB[/tex]

Answer:

A and B

Explanation:

To find the volume of 2400kg of gasoline with a density of 0.7g/cm³, convert the mass to grams and then divide by the density, yielding a volume of 3,428,571.43 cm³ or 3428.571 L.

The question asks for the volume of 2400kg of gasoline, given the density of petrol is 0.7g/cm³ (not g/km³ as mentioned in the question, which seems to be a typo). To calculate the volume, use the formula Volume = Mass / Density. First, convert the mass of gasoline from kilograms to grams (since the density is given in grams per cubic centimeter), which is 2400kg * 1000g/kg = 2,400,000g. Then, divide this by the density of petrol to find the volume. Hence, Volume = 2,400,000g / 0.7g/cm³ = 3,428,571.43 cm³ or 3428.571 L (since 1,000 cm³ is equivalent to 1 L).

Answer:

its D

Explanation:

because they share similar amounts of electrons in their outer shell. and characteristics is a learned trait which makes sense if we live with our family we would most likely act like them.

Answer: D

Explanation:

Just got it right on the quiz