Evaporating, condensing, melting and freezing are all examples of chemical change.

As the Earth moves closer to the Sun, the angular velocity of the Earth increases to keep its angular momentum constant. This means that the Earth's angular momentum when it is closest to the Sun is greater than when it is farthest from the Sun. Therefore, option (a) greater is the correct answer.

Angular momentum is constant when no external force acts on an object. The Sun's gravitational pull, which is an external force, causes the Earth's orbit to change, but the Earth's angular momentum stays constant.

The Earth's angular momentum changes as its distance from the Sun changes. The angular momentum of the Earth is inversely proportional to its distance from the Sun. As the Earth moves closer to the Sun, the angular velocity of the Earth increases to keep its angular momentum constant. This means that the Earth's angular momentum when it is closest to the Sun is greater than when it is farthest from the Sun.

option (a) greater is the correct answer

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Answer:

ok

Explanation:

Acceleration is defined as the rate of change of velocity.

Acceleration = (Change in velocity) / time taken

Acceleration = (Final velocity - initial velocity) / time

As the object velocity changes by the same amount in each second, it means the acceleration is constant.

sine wave or sinusoidal wave -

sine wave can be described as a geometric waveform that oscillates periodically.

It retains its wave shape when added to the another sine wave of the same frequency.

It is a continuous wave.

the general form of sine wave is

y = asin(bx)

where

amplitude is the maximum displacement from its mean position to extreme position.

Periodicity is a repeating continuous pattern which determine its wavelength and frequency.

Frequency of sine wave.

1kHz that is sine wave goes through thousand complete cycle in one second.

Speed of sine wave.

Speed = frequency x wavelength

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Answer:

muscular force in relative to this

Answer:

The process of comparison of unknown quantity with the help of known standard quantity is known as measurement...Hope this helps:)

Answer:

the comparison of an unknown quantity with the known quantity.

Explanation:

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There are three infrastructure projects wherein thermal expansion & contraction may be a problem are constructing roads, towers, and sidewalks.

The propensity of matter to alter structure, volume, or area in reaction to a temperature change is known as thermal expansion. The average molecular energy of a substance has a monotonic relationship with temperature. Heat makes molecules move more quickly & take up more space, which causes thermal expansion.

The expansion of heated air is the most obvious example. Heat helps the air expand, making it lighter than the air around it. This causes the hot air to be forced (upward), which causes steam and smoke to rise, warm air balloons to float, and so on.

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Answer:

F = 9800(42667 + 16000)

F = 5.75 × 10⁸N

Explanation:

Answer:

2 minutes or 120 seconds

Explanation:

The answer is 2 minutes or 120 seconds because 36 km is 36000 m and 36000 divided by 300 is 120, so the answer is 120 seconds, and converted to 2 minutes. Hope it helps!

The projectile's initial velocity is 36.05 metres per second horizontally, 26.98 metres per second vertically, and 38.19 metres per second at an angle of 18.32 degrees below horizontal.

R equals u2 sin(90+2)g=u2 cos 2g for the angle (45+). Q. The ratio is used to represent the horizontal ranges covered by two projectiles launched from the same location with the same velocity at angles of (45°) and (45°+).

a) The horizontal component of the initial velocity: The formula for calculating the horizontal component of the initial velocity is

Vx = V cosθ

where V is the starting speed and is the projection angle with respect to the horizontal.

By substituting the provided values, we obtain:

Vx = 45 m/s sin 37 o

Vx = 36.05 m/s (rounded to two decimal places) (rounded to two decimal places)

As a result, the starting velocity's horizontal component is 36.05 m/s.

b) The initial velocity's vertical component

The equation Vy = V sin, where V is the starting velocity and is the angle of projection with the horizontal, can be used to calculate the vertical component of the initial velocity.

By substituting the provided values, we obtain:

Vy = 45 m/s sin 37°

Vy = 26.98 m/s (rounded to two decimal places)

Therefore, the vertical component of the initial velocity is 26.98 m/s.

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Two light bulbs are parallel-connected in a circuit. If two more light bulbs were put in parallel to the initial ones, Each bulb's brightness would get dimmer as the circuit's overall resistance got lower. Because the circuit's overall resistance would rise, each bulb's brightness would also rise. Even if the circuit's overall resistance would decrease, each bulb's brightness would not change. Even if the circuit's overall resistance would rise, the intensity of each bulb would stay the same.

A resistor is a passive two-terminal electrical component used in circuits to implement electrical resistance. Resistors have a variety of purposes in electronic circuits, including lowering current flow, adjusting signal levels, dividing voltages, biassing active components, and terminating transmission lines.

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Step 1;

Given,

The mass of the person, m=57.0 kg

The radius of the track, R=42.7 m

The normal force acting on the person, N=995 N

Step 2:

The centripetal force required for the person is provided by the sum of the difference in the normal force and the weight of the person.

Thus the centripetal force on the person is given by,

Where v is the speed with which the car and the person are moving and g is the acceleration due to gravity.

On rearranging the above equation,

Step 3:

On substituting the known values in the above equation,

Thus the velocity of the car is 18.08 m/s

Answer:

distance = (10/3) m or 3.33... m

Explanation:

When the direction of force and distance is the same,

Work = Force × distance

So,

1000J = 300N × distance

=> 1000J/300N = distance

=> (10/3) m = distance

=> 3.33... m = distance

The expression for gravitational potential energy at distance r in terms of gravitational potential is U = -G × M × m / r + V

The gravitational potential energy (U) of an object of mass (m) at a distance (r) from a central mass (M) can be expressed in terms of the gravitational potential (V) as

U = -G × M × m / r + V

where G is the universal gravitational constant. The term -G × M × m / r represents the gravitational potential energy of the object in isolation, while the term V represents the contribution to the potential energy due to the presence of other masses in the system.

Note that the negative sign in front of the gravitational potential energy term is due to the fact that work must be done to move the object away from the gravitational field, and therefore the potential energy is defined as negative.

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The universe is expanding. Therefore, option (B) is correct.

The big bang theory is the prevailing cosmological model that describes the origins of the universe. It proposes that the universe began as a singularity, an infinitely hot and dense point, which rapidly expanded in a massive explosion approximately 13.8 billion years ago.

As the universe expanded, it cooled and matter began to form, eventually giving rise to galaxies and other large-scale structures. The big bang theory is supported by a wide range of observations and evidence, including the cosmic microwave background radiation and the observed distribution of galaxies in the universe.

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Answer:

use the formula

Explanation:

F = 1/ T

where F stands for frequency and T stands for period

sub in 3 Hz into frequency

3 = 1/T

0.333 = T

or in a fraction form

1/ 3

hope this helps

Answer:

the answer is 0.3 s

Explanation:

The air pressure oscillates with maximum amplitude at the antinodes of the standing wave. The distance between two successive antinodes is half of the wavelength.

The tube has two open ends, so it has a fundamental standing wave and the other harmonics. The fundamental mode has a wavelength of twice the length of the tube. The distance from the left end of the tube where the air pressure oscillates with maximum amplitude is half of the wavelength, which is the distance between two successive antinodes.The distance of the antinodes from the left end of the tube (for the fundamental mode) is given by the formula:Distance of antinodes from left end = (2n - 1)λ/4where n = 1, 2, 3, ... and λ is the wavelength.In the fundamental mode, λ = 2L where L is the length of the tube,

Distance of antinodes from left end = (2n - 1)

λ/4 = (2n - 1)(2L)/4

= (2n - 1)L/2

where n = 1, 2, 3, ...For the fundamental mode (n = 1), the distance from the left end of the tube where the air pressure oscillates with maximum amplitude is given by:

Distance of antinodes from left end = (2n - 1)L/2

= (2 - 1)L/2

= L/2

Thus, the air pressure oscillates with maximum amplitude at a distance L/2 from the left end of the tube.

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Answer:

I suggest that you recheck your answers multiple times and make sure that they are making sense. Also I think that you should Study the organisms very well and you should be careful when making observations so that you really are sure that the organism has 4 wings and not only 2 wings(for example).

Explanation:

I hope this answers your question  

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elasticity stretches and can also return to it's normal size ..

In order to properly configure the smart light bulbs, buyers should read the installation and configuration manual before connecting or using them to avoid possible damage due to improper handling.

The user manual is a tool that is usually included when we buy a product. This manual includes all the characteristics of the object that we have purchased and the recommendations and specifications for correct use and maintenance to prolong its useful life.

According to the above, what the common buyer should do to prevent their bulbs from being damaged and to be able to configure them properly is to read the user manual.

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(a) The wavelength of the resonance created is 0.8 m.

(b) The speed of the sound in the fundamental mode is 400 m/s.

(c) The low value of speed of speed of sound in water calculated may be as a result of low temperature of the water poured into the cooking pot.

The wavelength of the resonance created is determined by assuming the cooking pot to be a closed pipe.

Wavelength of fundamental mode of a closed pile = 4L

where;

λ = 4 x 0.2 = 0.8 m

The speed of the sound in the fundamental mode is calculated as follows;

v = fλ

v = 500 x 0.8

v = 400 m/s

Sound wave is directly proportional to temperture, as the temperature of the water increases, the speed of sound increases as well.

The low value of speed of speed of sound in water calculated may be as a result of low temperature of the water poured into the cooking pot.

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A bullet and a base ball

Objects with a small mass can produce a large acceleration if they experience a large force. This is described by Newton's second law of motion, which states that the acceleration of an object is directly proportional to the net force acting on the object and inversely proportional to its mass.

It's important to note that while these objects can produce a large acceleration, they can also cause significant damage or harm if not handled properly. It's important to always take appropriate safety precautions when working with objects that have the potential to produce large forces and accelerations.

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Answer:

Chemical energy is energy stored in the bonds of atoms and molecules. ...

Mechanical energy is energy stored in objects by tension. ...

Nuclear energy is energy stored in the nucleus of an atom—the energy that holds the nucleus together. ...

Gravitational energy is energy stored in an object's height.

Answer:

Nuclear power

Electricity

Mechanic

Gravity

Explanation:

Answer: the weight would be 4.6 (I think i don’t know))

Explanation:

Answer:

1) correct answer is ii  larger size

2) false, 3) false, 4) true, 5) true, 6) true

Explanation:

In this exercise, the answer is asked if the statement is true.

1) in the rapid cooling speed, there is no thermodynamic equilibrium, so the secondary phases do not have time to transform into the main one, therefore many phases appear in the products,

the correct answer is ii

2) False. The transformation of a material to the glass state requires a fixed temperature and rapid changes to reach this temperature,

3) False. The most stable state is the crystalline state, the glass states are metastable, their Gibbs energy is not the lowest possible and they must transition to the crystalline state over time, it can be years or centuries.

4) True. The melting and freezing temperatures change for each material, within the same material it always has the same value, since it corresponds to a change in the state of the system.

5) true. Cast iron is called gray because of the impurities inside that have not had time to move due to rapid cooling.

6) True. The microstructure is reduced in the process of cooling and heating

The switch that adjusts the magnetic field to be either nearly uniform or have a strong gradient will affect the current in the two coils differently.

When the magnetic field is nearly uniform at the center, the current in both coils will remain relatively unchanged. The uniform field will not induce any significant voltage in the coils, so the current will flow through them as usual.

However, when the magnetic field has a strong gradient, the current in the two coils will be affected differently. The rapidly changing field will induce a voltage in the coils according to Faraday's law of electromagnetic induction. This induced voltage will result in a change in the current flowing through the coils. The magnitude and direction of the induced current will depend on the specific characteristics of the coils and the magnetic field gradient.

In summary, the switch that changes the magnetic field from uniform to having a strong gradient will induce a change in the current flowing through the coils due to the induced voltage.

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Answer:

B) 1.9 m/s2 northwest

Explanation:

Given parameters:

Initial velocity  = vi  = 35m/s

Final velocity  = vf  = 62m/s

Time  = 14s

Unknown:

Acceleration  = ?

Solution:

Acceleration is the rate of change of velocity with time.

   Acceleration  = \(\frac{Vf - Vi}{t}\)  

Vf is the final velocity

Vi is the initial velocity

t is the time taken

   Acceleration  = \(\frac{62 - 35}{14}\)   = 1.93m/s² northwest

Answer: The answer is B) False

Explanation: There are only three muscle types in the exercise physiology.

Skeletal Muscle

Smooth Muscle

Cardiac Muscle

Answer:

They will separate and either burn out or fall into the sea.

Explanation:

The rocket will become too hot for the satellite to handle. So when they separate the satellite will be destroyed, and just be floating junk in space or fall in the ocean and cause more problems for us.

Answer:

Explanation:

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The velocity of baseball that was initially at restand changing momentum by 11 kgm/s is 73.3m/s.

We can find the velocity of the player.

Momentum = mass * velocity

Given

Mass = 0.15kg

Momentum = 11kgm/s

Get the velocity

Velocity = Momentum/Mass

Velocity = 11/0.15

Velocity = 73.3m/s

Hence the velocity of the player is 73.3m/s

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