What best describes the temperature at which a liquid turns to gas?
A.)Melting point B.)Boiling point C.) Electrical conductivity D.)Thermal conductivity

Answer:

700j

Explanation:

Answer: A) They all orbit the sun

Explanation:

Dwarf planets are rocky bodies almost round in shape which orbit the Sun. For example- Pluto and Ceres.

Asteroids are irregular shaped and sized rocky bodies which orbit the Sun. Majority of the asteroids are found in between orbits of Mars and Jupiter.

Comets have rocky surface composed of frozen gases. Comets come from outskirts of solar system. These objects also orbit the sun.

Meteoroids are debris of comets and other celestial objects in the solar system. These meteoroids also orbit the Sun.

Thus, the common characteristic of all the  given small celestial objects is that they all orbit the Sun.

Answer:

c) wedge

Explanation:

A school bus travels 15 kilo-meters in 0.75 hours. The speed of the school bus is 20 Km/h.

The speed of an object is the magnitude of the change of its position over time or the magnitude of the change of its position per unit of time; it is thus a scalar quantity.

Given in the question there is a school bus travels 15 kilo-meters in 0.75 hours, So, to find the speed of the school bus

Speed = total distance/ time taken

Speed = 15/ 0.75

Speed = 20 Km/hr

A school bus travels 15 kilo-meters in 0.75 hours. The speed of the school bus is 20 Km/h.

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Final answer:

The speed of the school bus is 20 kilometers per hour.

Explanation:

To calculate the speed of the school bus, we need to divide the distance it traveled by the time it took to travel that distance. In this case, the bus traveled 15 kilometers in 0.75 hours. So:

Speed = Distance / Time = 15 km / 0.75 h = 20 km/h

Therefore, the speed of the school bus is 20 kilometers per hour.

Pushing harder on the pedals when starting a bicycle is required to overcome inertia and higher static friction compared to the lesser force needed to maintain constant velocity due to rolling resistance and air resistance.

The reason you must push harder on the pedals to start a bicycle moving rather than to keep it moving at a constant velocity is due to inertia and the static friction present when the bicycle is at rest. Starting the bicycle requires enough force to overcome inertia, which is the property of matter that resists changes in its state of motion. Since the bicycle and rider are initially at rest, a greater force is needed to accelerate them to a moving state. Additionally, static friction between the tire and the ground is higher when the bike is stationary. Once the bicycle is in motion, only enough force to overcome rolling resistance and air resistance is necessary to maintain a constant velocity, which is generally less than the force required to start moving from rest.

To solve this we must be knowing each and every concept related to collisions. Therefore, the correct option is option A among all given options.

Two items collide when they briefly come into touch with one another. To put it another way, a collision is a brief reciprocal encounter between two masses in which the momentum or energy of the masses change.

Total momentum, total energy, and full kinetic energy are all conserved in an elastic collision. The forces engaged in the brief encounter are preserved in nature, therefore the entire mechanical energy also isn't changed into a different energy type.  If there is energy lost in the collision to sound, heat, etc., the collision is inelastic.

Therefore, the correct option is option A.

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Answer:

Part a)

[tex]v_{avg} = 37.5 m/s[/tex]

Part b)

[tex]a = 2.25 m/s^2[/tex]

Part c)

[tex]d = 750 m[/tex]

Explanation:

Part a)

Since we know that bus is moving uniformly from initial speed of 15 m/s to 60 m/s in 20 seconds

So we will have

[tex]v_{avg} = \frac{d}{t}[/tex]

we know that

[tex]d = \frac{v_f + v_i}{2} t[/tex]

so we have

[tex]v_{avg} = \frac{v_f + v_i}{2}[/tex]

[tex]v_{avg} = \frac{15 + 60}{2}[/tex]

[tex]v_{avg} = 37.5 m/s[/tex]

Part b)

As we know that acceleration is rate of change in velocity

so it is given as

[tex]a = \frac{v_f - v_i}{t}[/tex]

[tex]a = \frac{60 - 15}{20}[/tex]

[tex]a = 2.25 m/s^2[/tex]

Part c)

distance moved by the bus is given as

[tex]d = v_{avg} \times t[/tex]

[tex]d = 37.5 \times 20[/tex]

[tex]d = 750 m[/tex]

look at me answering a question from 2017 its 2021 \(^o^\) (/^o^)/

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C is correct tho I just took the test '^'

Answer:

a fundamental force is the correct answer.

Explanation:

gravity is a fundamental force that attract two objects towards each other.

fundamental forces that work among elementary bodies and that are mediated by more than one particle.

There are four types of fundamental force

Gravity is the weakest force.

Answer:c) variation in the population exists

Explanation:

Answer: C) variation in the population exists.

Explanation:

Based on Darwin, the most important requisite for natural selection is the variance in the genetics of the individuals of some species.

These differences, produced by mutations, may have a positive effect or a negative effect in the life of the subjects, where, statistically, the positive mutations will prevail as the species reproduces.

So the right answer would be C, Variation in the population exists.

The color of stars with the highest surface temperature is bluish, and the color of stars with the lowest surface temperature is reddish.

The color of a star primarily depends on its surface temperature. Hotter stars emit more energy and tend to appear bluish, while cooler stars emit less energy and appear reddish. This is due to the fact that hotter objects emit more high-energy, short-wavelength light, which corresponds to the blue end of the spectrum. Conversely, cooler objects emit more lower-energy, long-wavelength light, associated with the red end of the visible spectrum. For example, a star with a surface temperature around 10,000 °C will appear blue or bluish-white, while a star with a surface temperature around 3,000 °C will appear red. This correlation between color and temperature is vital for astronomers, as the color index provides a way to measure the temperatures of stars. The color of stars effectively acts as a sort of cosmic thermometer, allowing astronomers to deduce various characteristics of a star including its size, age, and chemical composition.

The power of a wave measures the amount of energy the wave transmits in per unit time

The correct option that could increase the power of a wave in a spring is option D.

D. All of the above

The reason the selected option is correct is given as follows;

The power of a wave in a string is given by the following equation;

Where;

μ = The string's mass per unit length

ω = The wave's angular frequency

A = The wave amplitude

v = The velocity of propagation of the wave

[tex]v = \sqrt{\dfrac{T}{\mu} }[/tex]

T = Tension in the string

Increasing the power of the wave in a string, can be done by either;

Therefore, all the options are correct

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Answer:

Part a)

a = 2 m/s/s

Part b)

a = - 25 m/s/s

Explanation:

As we know that the average acceleration id defined as the rate of change in the velocity of the object

so here it is given by formula

[tex]a = \frac{v_f - v_i}{\Delta t}[/tex]

now we know that

[tex]v_f = 20 m/s[/tex]

[tex]v_i = 0[/tex]

[tex]\Delta t = 10 s[/tex]

now we have

[tex]a = \frac{20 - 0}{10} = 2 m/s^2[/tex]

Part b)

here car is travelling with speed 100 m/s

now driver slams brakes and car finally stop in t = 4 s

so the average acceleration is given as

[tex]a = \frac{v_f - v_i}{\Delta t}[/tex]

now we know that

[tex]v_f = 0 m/s[/tex]

[tex]v_i = 100[/tex]

[tex]\Delta t = 4 s[/tex]

now we have

[tex]a = \frac{0 - 100}{4} = -25 m/s^2[/tex]

The variables in the terms of V and ϕ separated by a comma are Vx = v sin phi, Vy = V cos phi

A quantity or phenomenon with independent qualities for both magnitude and direction is called a vector. The term can also refer to a quantity's mathematical or geometrical representation.

The vector V makes an angle with the Y axis, as indicated by the question.

Calculating the x component and y component, which stand for the horizontal and vertical components, is required. Take into consideration a two-dimensional coordinate system with two perpendicular axes, the X and Y axes.

The Y axis and the vector V are at an angle θ. Let's use the symbols for the x and y components, Vx and Vy respectively.

Therefore, the variables are Vx = v sin phi, Vy = V cos phi.

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Ken lives in an agricultural society where his community engages in farming and animal domestication for subsistence and income. The community is settled, which contrasts with nomadic hunter-gatherer or pastoral societies, and revolves around horticulture or intensive agriculture.

Ken lives in an agricultural society. This type of society is rooted in farming and domestication of animals for subsistence and income. With settled communities, Ken's society has shifted from the nomadic lifestyle of hunter-gatherer or pastoral societies to a more stationary form of living where they cultivate land and breed domestic species for food. As agriculture allows for surplus production, it also enables the development of specialized occupations, trade, and the creation of settled villages, which can develop into more complex sociopolitical structures.

In Ken's community, where extensive horticulture or intensive agriculture is practiced, members of the community may be part of a peasant class in their nation-states, working small plots of land within a larger regional economy. Despite the advancements that technology brings to smooth out the harshness of existence, such societies are dependent on their environmental ecosystems, and any changes to them can significantly impact their way of life.

The momentum for the given mass will be 804.6 kgm/s. Momentum is occurring due to the applied force. Its unit is Kg m/s.

The momentum is defined as the product of mass and the velocity of the body. It is denoted by the letter P. It occurs due to the applied force. Its unit is Kg m/s².

The given data in the problem is;

Mass(m)= 0.1 kg

Velocity(v)=5 miles per second =8046.72 m/sec

Momentum = mass × velocity

P=0.1 × 8046.72 m/sec

P=804.6 kgm/s

Hence, the momentum for the given mass will be 804.6 kgm/s

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Final answer:

Momentum is the product of an object's mass and velocity, calculated using the formula Momentum = mass x velocity. In the scenario provided, a 0.1 kg mass moving at 5 miles per second west has a momentum of -0.5 kg*miles/s west.

Explanation:

Momentum is the product of an object's mass and its velocity. It is a vector quantity, meaning it has both magnitude and direction.

To calculate momentum, you can use the formula: Momentum = mass x velocity.

In the given scenario, the momentum of a 0.1 kg mass moving at 5 miles per second west would be 0.1 kg x (-5 miles/s) = -0.5 kg*miles/s west.

Answer:

Kinetic energy and mass are directly proportional.

Explanation:

The kinetic energy of an object is given by:

[tex]K=\frac{1}{2}mv^2[/tex]

where

m is the mass of the object

v is the speed of the object

From the equation above, we see that the kinetic energy (K) depends linearly on the mass (m), so kinetic energy and mass are directly proportional to each other.

Elements in the same group of the periodic table have similar chemical properties because they have the same number of valence electrons.

The elements in the same group of the periodic table have similar chemical properties because they have the same number of valence electrons. Valence electrons are the outermost electrons in an atom, and they determine how the atom will react with other atoms. For example, elements in Group 1 (alkali metals) all have one valence electron, so they tend to lose that electron and become positively charged ions. Similarly, elements in Group 17 (halogens) have seven valence electrons, so they tend to gain one electron and become negatively charged ions.

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Answer : The correct option is, (C) [tex]N_2O_4(g)\rightarrow N_2(g)+2O_2(g)[/tex]

Explanation :

Decomposition reaction : It is a type of reaction in which a single compound decomposes into two or more new compounds.

The decomposition of dinitrogen tetraoxide into nitrogen gas and oxygen gas is shown by balanced chemical equation.

The balanced decomposition reaction will be,

[tex]N_2O_4(g)\rightarrow N_2(g)+2O_2(g)[/tex]

By the stoichiometry, 1 mole of dinitrogen tetraoxide decomposes into 1 mole of nitrogen gas and 2 moles of oxygen gas.

Hence, the correct option is, (C)

Answer:

19

Explanation:

It's just basic stuff