A mosquito flying at 3 m/s that encounters a breeze blowing at 3 m/s in the opposite direction has a speed of
A) 0 m/s
B) 3 m/s
C) 4 m/s
D) 6 m/s

Answer:

v = 30 m/s

Explanation:

KE = (1/2)*m*v²

675,000J = .5*1500kg* v²

v² = (675,000J)/750kg

v = sqrt(900)

v = 30 m/s

Answer:

D. Pearl Harbor

Explanation:

A truck with a mass of 2500 kg travelling with an acceleration of 5 m/s2 hits a stationary scooter of mass 100 kg.  The acceleration of the scooter will be 125 m/s².

The acceleration of the scooter after the collision can be found using the conservation of momentum principle.

Initial momentum of the system = Final momentum of the system

Initial momentum = (mass of truck * initial velocity of truck) + (mass of scooter * initial velocity of scooter)

Final momentum = (mass of truck * final velocity of truck) + (mass of scooter * final velocity of scooter)

Since the scooter is initially stationary, its initial velocity is 0. We know the mass of the truck (2500 kg) and its acceleration (5 m/s²). To find its initial velocity, we need to determine the force acting on the truck:

Force = mass * acceleration

Force = 2500 kg * 5 m/s² = 12500 N

Now, we know that the force acting on the truck is equal to the force acting on the scooter (Newton's third law).

So, we can find the acceleration of the scooter:

Force = mass of scooter * acceleration of scooter

12500 N = 100 kg * acceleration of scooter

Acceleration of scooter = 12500 N / 100 kg = 125 m/s²

Thus, the acceleration of the scooter after the collision will be 125 m/s².

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Now our wavelength is getting longer because the waves are stretching out. This makes the 1. Frequency is lower as well as the pitch we hear.

Wavelength is the gap among equal factors (adjacent crests) in the adjacent cycles of a waveform sign propagated in the area or alongside a twine. In wi-fi systems, this duration is generally laid out in meters (m), centimeters (cm), or millimeters (mm).

Equation of the wavelength, we will tell that the wavelength of a wave is inversely proportional to its frequency, i.e., because the frequency of a wave increases, its wavelength decreases.

A better-frequency sound has a better pitch, and a decreased-frequency sound has a lower pitch. In discern 10.2 sound A has a better pitch than sound B. for example, the chirp of a bird would have an excessive pitch, but the roar of a lion could have a low pitch. The human ear can discover a huge variety of frequencies.

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Disclaimer:- your question is incomplete, please see below for the complete question.

Now our wavelength is getting longer because the waves are stretching out. This makes the _________ lower as well as the pitch we hear.

1. Frequency

2. Loudness

3. Amplitude

Answer:

I'm not sure but I think it is electric currents in the outer core

The element that conducts thermal energy well and is easily shaped is a metal. Their malleability and ductility allows for the creation of intricate shapes and structures.

Metals, such as copper, aluminum, iron, and silver, possess excellent thermal conductivity properties, allowing them to efficiently transfer heat. The high thermal conductivity of metals is due to the presence of free electrons that can easily move and transfer thermal energy.

Metals are also known for their malleability and ductility, which means they can be easily shaped and formed into various structures. This property is attributed to the metallic bonding present in metals, where the positive metal ions are surrounded by a "sea" of delocalized electrons, enabling the atoms to slide past each other when subjected to external forces.

These combined characteristics make metals ideal for applications that require effective heat transfer, such as in electrical wiring, heat sinks, cooking utensils, and industrial machinery. Additionally, their malleability allows for the creation of intricate shapes and structures, making metals highly versatile in various industries and applications.

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The vast size of the American continent, which poses an insurmountable obstacle to its conquest.

1. The main idea of the text is that European powers would find it difficult to wage a successful continental war against the American Union due to various factors, including distance, resource availability, and the size of the American continent.

2. The evidence in the text that supports this analysis includes the following points:
- Maritime wars are easier to support and less dangerous for a commercial nation than a continental war.
- The difficulties in transporting and maintaining a large number of soldiers in America, as the author mentions that a European nation would struggle to maintain more than 25,000 soldiers.
- The difference in population size, with the most populous European nation being compared to a nation of 2 million inhabitants at war with an American Union of 12 million.
- The availability of resources, as America has all its resources within reach, while European nations would be 4,000 miles away from theirs.
- The vast size of the American continent, which poses an insurmountable obstacle to its conquest.

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The energy to support a large number of animals in areas with abundant phytoplankton comes from the primary production of phytoplankton through photosynthesis, forming the basis of the marine food web.

The large numbers of animals in areas with abundant phytoplankton are supported by the energy derived from the process of photosynthesis. Phytoplankton are microscopic algae that contain chlorophyll and other pigments, allowing them to convert sunlight, carbon dioxide, and nutrients into organic matter through photosynthesis. This primary production by phytoplankton forms the foundation of the food web in marine ecosystems.As phytoplankton grow and reproduce, they become a rich source of energy and nutrients for other organisms. Zooplankton, which are small marine animals, feed on phytoplankton, and in turn, become food for larger organisms such as fish and marine mammals. This transfer of energy and nutrients continues up the food chain, supporting the entire ecosystem. The high productivity of phytoplankton in certain areas, such as the west coast of the U.S., can be attributed to various factors. These factors include nutrient availability, sunlight exposure, and oceanographic conditions that promote upwelling, bringing nutrient-rich deep waters to the surface. The combination of these factors creates favorable conditions for phytoplankton growth, resulting in an abundance of energy to support diverse and thriving marine ecosystems.

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Answer:

Solution given:

velocity=40cm/s

wave length=5cm

we have

frequency =velocity/wavelength=40/5=8hertz.

the frequency of the wave is 8 hertz.

Thomas Edison received a patent for his invention of a longer-lasting light bulb on January 27, 1880.

Edison had been working on improving the incandescent light bulb for several years, with the goal of creating a light source that could be used for longer periods of time and at lower cost.

Edison's light bulb used a carbon filament that was capable of burning for many hours, compared to the earlier bulbs that used filaments made of materials like bamboo or platinum that would quickly burn out.

Edison also developed a vacuum pump to remove the air from the bulb, which reduced the amount of oxygen that would react with the filament and cause it to burn out.

The invention of the longer-lasting light bulb was a major breakthrough in the development of electric lighting and paved the way for widespread use of electric lights in homes and businesses. Edison's patent on the light bulb was just one of the many patents he received during his prolific career as an inventor and entrepreneur.

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The resultant magnitude of the force which has an x component and y component is 10.84 N

The x component of the force = 6.89 N

The y component of the force = 8.37 N

The resultant of the force can be found using the formula,

             F = √(F₁² + F₂²)

where F is the magnitude of the net force

           F₁ is the x-component of the force

           F₂ is the y-component of the force

Let us substitute the known values in the above equation, we get

           F = √(6.89² + 8.37²)

              = √(47.47 + 70.06)

              = √117.53

              = 10.84 N

Therefore, the magnitude of the force is 10.84 N

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Answer:

It is when the focus of the ellipse that is closer to the point where Mars is moving the fastest.

Explanation:

I hope it helps! Have a great day!

Anygays-

The amplitude of the magnetic field for the given electromagnetic waves is \(1.21 * 10^{-9}\) T.

For electromagnetic waves the relation between electric field amplitude and magnetic field amplitude is given as

\(\frac{e_{0} }{b_{0} } = c\)

where c is the speed of light in free space i.e. \(3 * 10 ^{8}\) m/s.

Finding the amplitude of the magnetic field for the given question by substituting the values in the given relation :

\(b_{0} = \frac{e_{0} }{c}\)

\(b_{0} = \frac{0.365}{c} = 1.21 * 10^{-9}\) T

Electromagnetic waves are produced when an electric field interacts with a magnetic field. The term "electromagnetic" is used to describe them. The magnetic and electric fields of an electromagnetic wave are parallel (at right angles). They also follow the direction of the EM wave, but perpendicularly.

There is no redirection of them by electric or magnetic fields. Diffraction and interference are possible with EM waves.

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Answer:

velocity = 29.4 m/s

Explanation:

We have been told to calculate the velocity of a ball after 3 seconds of freefall. To do this, we can use the following formula:

\(\boxed{v = u + at}\),

where:

• v = final velocity

• u = initial velocity

• a = acceleration

• t = time of freefall

In this case, u = 0 m/s, because the ball is initially stationary before it is released. Also, a = 9.81 m/s² because the ball is falling while inside the Earth, where the acceleration of freefall is 9.81 m/s².

Using the above information along with the formula, we can calculate the velocity of the ball after 3 seconds of freefall:

v = 0 m/s + (9.81 m/s² × 3 s)

  = 29.4 m/s

Frictional force is reduced in smooth surfaces but is large in rough surfaces.

Force is defined as an agent which causes a change in the motion or state of an object.

Forces are of two types:

Contact forces include frictional force.

Frictional forces refers to the force which acts between two surfaces in contact by opposing the relative motion of one over the other

Frictional force depends on the nature of surfaces in contact where rough surfaces produce greater frictional force than smooth surfaces.

Therefore, frictional force is reduced in smooth surfaces but is large in rough surfaces.

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Answer:

16m/s/s

Explanation:

Solving for acceleration you do a=Vf-Vi/a and since the car stopped at a red light the Vi is 0m/s and since the car speeds up to 80m/s the Vf is 80m/s and the time is 5s and the answer would be 16m/s/s

Answer:

Giant impacts in its early history may have torn away much of its original crust and mantle.

So Mercury has a giant iron core, but why?

There are three general ideas.

1. Mercury was once the core of a gas giant that vaporized when the Sun became a fully-fledged star. This gas giant was probably more like Uranus or Neptune than Jupiter or Saturn.

There are significant issues here, especially that Mercury's existing surface has been exposed to space since the solar system's initial beginnings. On Mercury, remnants of the first massive bombardment have been found.

2. Mercury formerly had a deeper mantle and was a bigger terrestrial planet. During the early history of the solar system, a dwarf planet made a massive impact that robbed the planet of its mantle.

The existing surface of Mercury has been exposed to space since the very beginning of the solar system, which raises major issues once more.

Due to the factors in explanation 1, characteristics from the first significant bombardment have been found on Mercury. The quantity of low temperature volatiles that are trapped and sometimes sublimate out of the crust, causing hollows, is also a major issue. By such an impact, these low temperature volatiles—such as sodium, sulphur, magnesium, etc.—would have been completely pushed out.

3. A mostly iron-rich body developed, and "rock steam"—a gaseous mixture of atomic oxygen and silica—condensed and accreted onto it from the protoplanetary disk near the Sun. Small rock particles with lower temperature volatiles were subsequently formed into a crust. Additionally, it appears that iron was concentrated in the inner region of the protoplanetary disk by the Sun's early, extremely powerful magnetosphere.

Whilst there are a few minor issues with this, this appears by far the most likely scenario.

Its crust and mantle may have been significantly altered during its early history by massive collisions.

The extremely hot and dense core of Earth is called the core. Under the mainly solid mantle and the chilly, brittle crust is the ball-shaped core. The radius of the core is about 3,485 kilometers, and it can be located around 2,900 kilometers (1,802 miles) beneath the surface of the Earth (2,165 miles). Earth is more ancient than the core.

Approximately 4.5 billion years ago, Earth was a uniform ball of hot rock. The ball warmed up considerably more due to radioactive decay and residual heat during planetary formation. After roughly 500 million years, the temperature of our new planet reached 1,538 degrees Celsius (2,800 degrees Fahrenheit), which is the temperature at which iron melts. The iron catastrophe refers to this critical moment in Earth's history.

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Given that the time between when the marathon runner changes her velocity and the finish line is t, the acceleration of the runner approaching the finish line is 0.22/t m/s² .

The acceleration of a body is the change in the velocity of a body with time.

Acceleration is a vector quantity as it takes into account the change in velocity as well as the change in the direction of the body.

Hence, a body is accelerating if either or both of these two conditions apply:

Mathematically;

The change in velocity of a body = Final velocity - initial velocity

Change in velocity of the runner = 4.17 - 3.95

Change in velocity of the runner = 0.22 m/s

Time taken for this change = t

Hence;

acceleration = 0.22/t m/s²

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The correct statement is: d) The Ogallala aquifer is recharged more slowly than it is being used.

The current use of water from the Ogallala aquifer in the Great Plains region of the United States is unsustainable because it is being recharged at a slower rate than it is being used. The aquifer, which originated many centuries ago, is a vital source of water for agricultural, industrial, and domestic purposes in the region.

However, due to excessive withdrawals and inefficient water management practices, the rate of water extraction exceeds the natural replenishment rate. This has led to a decline in water levels, increased pumping costs, and the risk of aquifer depletion in the long term.

Sustainable water management practices and conservation efforts are necessary to ensure the long-term viability of the Ogallala aquifer as a water resource. Hence,  It is recharged more slowly than it is being used.

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The given statement "the greatest shear stress to the acl occurs in 60° to 90° flexion in an open kinetic chain exercise." is TRUE. The greatest shear stress to the anterior cruciate ligament (ACL) occurs in the range of 60° to 90° flexion during open kinetic chain exercises.

This is because at this angle, the forces acting on the knee joint are most likely to produce shear stress on the ACL, which is the primary restraint to anterior tibial translation. Closed kinetic chain exercises, on the other hand, are thought to produce less shear stress on the ACL as the foot is in contact with the ground and the forces are distributed more evenly across the joint.

It is important for individuals recovering from ACL injury or surgery to be aware of these factors and modify their exercises accordingly to prevent re-injury or further damage to the ligament.

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For a planet or moon to have planet-wide convection cycles, it must have a molten or partially molten interior, a strong global magnetic field, and a thick mantle that can support convection over long periods of time.

For a planet or moon to have planet-wide convection cycles, several conditions need to be met. The first requirement is that the planet or moon must have a molten or partially molten interior, which allows for the movement of material within the mantle. This movement is driven by heat transfer from the planet's core, which creates thermal gradients that cause material to rise and fall in a convection cycle.
Another requirement is the presence of a strong, global magnetic field. This magnetic field is generated by the movement of molten material in the planet's core and helps to protect the planet from harmful solar radiation. It also plays a crucial role in driving convection cycles, as the magnetic field interacts with the convecting material in the mantle.
Finally, the planet or moon must have a relatively thick mantle that is capable of supporting convection over long periods of time. This requires a sufficient amount of heat to be generated within the core and a slow cooling rate, which allows the mantle to remain molten for billions of years.
In summary, for a planet or moon to have planet-wide convection cycles, it must have a molten or partially molten interior, a strong global magnetic field, and a thick mantle that can support convection over long periods of time.

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Answer:

Ball 3 (tennis ball)

Explanation:

Formula we are using :

acceleration = Force / mass

=============================================================

Ball 1 :

⇒ acceleration = 15 N / 0.5 kg

⇒ acceleration = 30 m/s²

===========================================================

Ball 2 :

⇒ acceleration = 15 N / 4.5 kg

⇒ acceleration = 30/9 m/s²

⇒ acceleration = 10/3 m/s²

⇒ acceleration = 3.33 m/s²

===========================================================

Ball 3 :

⇒ acceleration = 15 N/ 0.05 kg

⇒ acceleration = 300 m/s²

============================================================

On comparing, we see that Ball 3 (tennis ball) has the greatest acceleration.

Answer:

D

Explanation:

Because full time 4WD does not allows the driver to select 2WD or 4WD. And part-time 4WD does not includes a differential or viscous coupling that allows the front and rear axles to rotate at different speeds.

Answer:

Nanomagnetic chips.

Explanation:

In a computer, the hard disk drive chips are magnetic.

A non-volatile data storage device is a computer hard disk drive (HDD). Non-volatile storage devices are those that retain data even after being turned off. HDDs are merely one form of storage device, yet they are required by all computers.

Desktop computers, mobile phones, consumer gadgets, and enterprise storage arrays in data centers are frequently equipped with HDDs. They can use magnetic disks to store operating systems, applications, and other things.

Hence, Hard disk drive is belongs to one of those chips which at magnetic in nature.

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Answer:

middle ear has three bones! the hammer, anvil, stirrup, and ear drum

Explanation:

The effect of the distance of a launcher affects the speed of a car in that an optimum distance is desirable for optimal performance.

If the distance is too small the speed of the car will be minimal, also of the distance is too large, the speed of the car will be small also.

Hence, the speed is optima only when we have an optima distance in between.

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The proportional equation that matches the context of a 33-inch candle burning down in 12 hours is b = 2.75t.

A candle that is 33 inches long is called a 33-inch candle. Candles are a popular decorative item that is commonly used for lighting, as decoration for weddings, and parties, or to create an aromatic atmosphere. B represents the length of the candle that has burned away at any time given in hours, t.

To find the proportional equation for b in terms of t that matches the context of a 33-inch candle burning down in 12 hours, the following steps should be followed:

Identify the given informationThe length of the candle (l) = 33 inchesThe time taken for the candle to burn down (t) = 12 hours

Determine the rate of burning The rate of burning of the candle is given by l/t. Therefore, the rate of burning = 33/12 = 2.75 inches per hour.

The proportional equation for b in terms of t is given by b = rt where r is the rate of burning. Therefore, b = 2.75t.

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We have: \(I=\frac{U}{R}=\frac{120}{20}=6A\)

ok done. Thank to me :>

Answer:

The Current is 6 Ampere.

Step-by-step explanation:

Given :

To Find :

Using Formula :

\( \star{\small{\underline{\boxed{\sf{ I = \dfrac{V}{R}}}}}}\)

Solution :

Substituting all the given values in the formula to find Current :

\({\dashrightarrow{\pmb{\sf{ I = \dfrac{V}{R}}}}}\)

\({\dashrightarrow{\sf{ Current = \dfrac{Voltage}{Resistance}}}}\)

\({\dashrightarrow{\sf{ Current = \dfrac{120}{20}}}}\)

\({\dashrightarrow{\sf{ Current = \cancel{\dfrac{120}{20}}}}}\)

\({\dashrightarrow{\sf{ Current = 6A}}}\)

\({\star{\underline{\boxed{\sf{\red{ Current = 6A}}}}}}\)

Hence, the Current is 6 Ampere.

\(\rule{300}{1.5}\)