If a 20g bullet has a momentum of 8kg calculate its velocity

Answer:

The angular speed will be 85.13 rad/sec

Explanation:

Answer:

The total applied force on the trolley is 5 N toward the North.

Explanation:

yes

Answer:

E = h f      and since f = c / λ     we have E = h c / λ

Thus  λ = h c / E

Also, 1 ev = 1.6E-19 C

λ = 6.63E-34 * 3.0E8 / (1.6 * 1.6E-19)

λ = 6.63 * 3.0 / (1.6 * 1.6) * E-7

λ = 7.77E-7 = 777 nanometers

(B) is correct

The rod she chooses, to give the sphere a uniform negative charge by induction is the positively charged rod.

Charging an object by induction is a process of inducing a charge on the object by bringing another charged object close to it.

When a positively charged rod is brought near a neutral sphere (equal negative and positive charge),  the positive charge of the rod will repel the positive charge of the sphere, leaving the sphere with excess negative charge.

Thus, the rod she chooses, to give the sphere a uniform negative charge by induction is the positively charged rod.

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How we could distinguish them is that the infrasonic sounds are the lower limit of human hearing while ultrasonic sound is above human hearing. The sound of frequency more than 20,000Hz are called ultrasonics while the frequency less than 20Hz are called infrasonics.

Explanation:

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c it hink this because im geuss

Answer:

1.927  m/s^2

Explanation:

period = 2 pi  sqrt ( l/g)  

3.2   =  2 pi sqrt (.5/g) =1.927 m/s^2

When the ball on a spring is replaced by a smaller ball with half the mass :  The period decrease by 29%

We will apply the formula below to calculate period

T = [tex]2\pi \sqrt{\frac{m}{k } }[/tex]

 where :

T₁ / T₂ = [tex]\sqrt{\frac{m_{1} }{m_{2} } }[/tex]    where m₂ = m₁ / 2

Therefore :

T₂ = [tex]\frac{T_{1} }{\sqrt{2} }[/tex]   = 0.71 T

Hence we can conclude that the period will decrease by 29% ( i.e 100 - 71 ).

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Answer:

d.the time it takes for the water to boil

Explanation:

it is because salt was added to the water.so the responding variable is the time taken to boil the water

Answer:

They release large amounts of carbon dioxide when burned.

They are expensive to extract compared to other forms of energy.

They do not replenish themselves

Explanation:

Answer:

When observed from Earth, the wavelengths of light emitted by a star are shifted toward the red end of the electromagnetic spectrum because: the star is moving away from planet Earth.

A star is a giant astronomical or celestial object that contains a luminous sphere of plasma and bounded together by its own gravitational force.

A redshift can be defined as a displacement (shift) of the spectral lines of celestial or astronomical objects toward longer wavelengths (the red end of an electromagnetic spectrum), as a result of the Doppler effect.

Hence, a redshift is considered to be a subtle change in the color of visible electromagnetic radiation from stars (starlight), as observed from planet Earth.

In conclusion, a redshift occur when observing a star from planet Earth because the star is moving away from planet Earth.

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Explanation:

have a great day :)

Answer:

For every force there is an equal and opposite reaction force.

For instance, if one wants to find the acceleration of a person standing on a scales, he uses the force exerted by the scales on the person,

One doesn't consider the reaction force of the person on the scales.

Likewise for the force of the sun on the earth

m v^2 / R = G M m / R^2 descibes the force acting on the earth to produce the centripetal acceleration of v^2 / R

The sun experiences the same centripetal acceleration as the earth, but since the mass of the sun is about 333,000 times the mass of the earth the acceleration can be ignored for most purposes.

When a satellite experiences an acceleration of v^2 / r, the earth is undergoing the same centripetal acceleration. However since the mass of the earth is much greater than that of a satellite and the centripetal acceleration of the earth is ignored.

The wavelength and frequency of the sound in the string is greater than the wavelength and frequency of the sound in the air.

The wavelength and frequency of the sound is determined using the following formulas.

v = fλ

f = v/λ

λ = v/f

where;

f = 600/λ

λ = 600/f

f = 333/λ

λ = 333/f

Thus, the wavelength and frequency of the sound in the string is greater than the wavelength and frequency of the sound in the air.

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Answer:The heat flows from an object at a higher temperature to the object at a lower temperature. Thus the option A is correct.

Explanation:What is heat flow?

The flow of heat is the transfer of heat that concerns its generation, use and conversion, and exchange.The heat flow follows the laws of the thermodynamics. Heat will flow from the body that is at a higher temperature and will move towards a body of a lower temperature. Thereby maintaining an equilibrium state. As energy is needed to warm or heat up the cold body there is an exchange of energy that takes place.

Answer:

C always

Explanation:

The force of friction between the object and the surface decrease immediately after the object starts to move.

The force preventing solid surfaces, fluid layers, and material components from sliding past one another is known as friction.

The definition of static friction is: The resistance people feel when they attempt to move a stationary object across a surface without actually causing any relative motion between their body and the surface they are moving the object across.

The resistance that is formed between any two items when they are sliding against one another is known as sliding friction.

It is experimentally proved that the force of friction between the object and the surface decrease, immediately after the object starts to move.

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Explanation:

r=1.2, Period(T) = 9s

a) Speed(V) = ωr

ω = 2 x Pi(3.142) x frequency

frequency = 1/period

therefore; the frequency will be 1/9 = 0.1Hz

Therefore Speed(V) = 2 x 3.142 x 0.1 x 1.2=0.75m/s

C) Centripetal and centrifugal forces are the forces experienced by rotating objects. The centripetal force keeps an object moving in a circle and is always pointed toward the center of that circle. For instance, the gravitational force of the sun is a centripetal force that keeps the Earth orbiting around it. Its direction is always orthogonal to the motion of the body and towards the fixed point of the instantaneous center of curvature of the path.

answer is 36

because the formulae of momentum is

mass×velocity

Answer:

of course is clear

Explanation:

very clear

Explanation:

Light rays that pass close to the black hole get caught and cannot escape. so what ends up happening to the light is that it starts bending due to the strong gravitational force of the black hole.

Answer:

Striking the head of the drum changes its shape and compresses the air inside the shell. The compressed air presses on the bottom head and changes its shape. Then, these changes are transmitted to the drum shell and reflected back, and this action is repeated, creating a vibration. These vibrations of the top and bottom heads create vibrations in the air, which become sound, and eventually, as the head vibrations are dampened, the sound diminishes.

Explanation:

Infrared radiation is a part of electromagnetic waves,which also include the visible light and radio waves.

The electromagnetic radiation consists of waves made up of electromagnetic field which are capable of propogating through space and carry the radiant electromagnetic energy.

The radiation are composed of electromagnetic waves which are synchronized oscillations of electric and magnetic fields . They are created due to change which is periodic in electric as well as magnetic fields.

In vacuum ,all the electromagnetic waves travel at the same speed that is with the speed of air.The position of an electromagnetic wave in an electromagnetic spectrum is characterized by it's frequency or wavelength.They are emitted by electrically charged particles which undergo acceleration and subsequently interact with other charged particles.

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Answer:

One way people are using technology to protect the environment is:

Using digital devices for communicating and storing information means that there is less reliance on paper, which reduces deforestation. Since trees are an important source of oxygen and also absorb carbon dioxide, this further reduces climate change.

Environmental technology has enabled us to capture this naturally occurring energy and convert it into electricity or useful heat through devices such as solar panels, wind, and water turbines.

Explanation:

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Answer:

weight

Explanation:

this is because of the lighter the object the faster it will be affected

Answer:

renewable are fuels that can be reused while non renewable are fuels that can not be used again

For the three different waves observed and recorded, Waves X and Y are light waves. This is further explained below.

Generally, A wave is simply defined as a disturbance that propagates through a medium from one point to another.

In conclusion,  Wave Z is impossible to classify, Waves X and Y are light waves, and Wave W is a sound wave.

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Answer:

D

Explanation:

Answer:

B.

Explanation:

It should be B. 18 million years ago.

I apologize if it is incorrect-

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Anygays-

Answer:

B. 18 million years

Explanation:

The answer is B. 18 million years

I hope it helps! Have a great day!

Muffin ^^

Answer:

A) would be the best explanation because hot air is less dense and would rise to the top of a column of air

Answer:

A

Explanation:

It depends on the scale of the volcanic eruption. A smaller eruption may only affect the nearby area, but a large one can affect the whole world. For example, the Krakatoa eruption of 1883 created an ash cloud which lowered global temperatures and affected the climate for a year afterwards.

An explosive eruption by a single volcano can affect only the lifeforms living on the volcano. The correct option is B.

A volcano is an opening in the Earth's surface through which molten rock, ash, and gas can escape. Volcanoes are formed by the movement of tectonic plates, which create weak spots or vents in the Earth's crust where magma can rise to the surface.

Volcanoes can form in different ways, but most are formed at plate boundaries, where one tectonic plate is moving under another (subduction zone), or where two plates are moving away from each other (divergent boundary). When magma rises to the surface, it can form a volcanic cone or mountain over time.

There are three main types of volcanoes, based on their shape and the type of eruptions they produce:

(i)Shield volcanoes - broad, gentle slopes formed by lava flows that spread out over a wide area.

(ii)Stratovolcanoes (also called composite volcanoes) - tall, steep-sided cones formed by alternating layers of lava, ash, and other volcanic debris.

(iii)Calderas - large, basin-shaped depressions that form when a volcano collapses or erupts so forcefully that it empties its magma chamber.

Volcanoes can be active, dormant, or extinct. Active volcanoes are those that have erupted recently or are expected to erupt soon, while dormant volcanoes have not erupted in a long time but could still erupt in the future. Extinct volcanoes are those that have not erupted in thousands of years and are unlikely to erupt again.

Here in the question,

An explosive eruption by a single volcano can have a significant impact on the surrounding environment and local communities, but its effects are generally limited to the immediate vicinity of the volcano. The eruption may release ash, gases, and lava flows that can cause damage to nearby ecosystems and affect the health of humans and animals living in the area. However, the effects are unlikely to extend beyond the local region, let alone affect lifeforms throughout the world.

Therefore,  B. only the lifeforms living on the volcano, is the correct option.

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