Two soccer players kick the same 1-kg ball at the same time in opposite directions. One kicks with a force of 25N the other kicks with a force of 10N . What is the resulting acceleration of the ball in m/s^2

Answer:15 newton force is required.

Explanation:

We know that

Force equal to mass x acceleration

3 kg x5 m/ s square

15( kg x m/s square)

15( newton)

15 N

The amount of force that is needed to accelerate a 3 kg skateboard at 5 m/s² is 15N

According to Newton's second law of motion, the formula for calculating the force required to accelerate an object is expressed as;

F = ma

m is the mass of the object

a is the acceleration

Given the following parameters

Mass = 3 kg

Acceleration = 5m/s²

Get the required force:

F = 3 * 5

F = 15 N

Hence the amount of force that is needed to accelerate a 3 kg skateboard at 5 m/s² is 15N

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Answer:

100.2 kg

Explanation:

The period of vibration of a spring-mass system is given by

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

where

T is the period

m is the mass

k is the spring constant

In this problem, we know

T = 1.419 s is the period

k = 1962 N/m is the spring constant

Re-arranging the equation, we can find the mass:

[tex]m=k(\frac{T}{2\pi})^2=(1962 N/m)(\frac{1.419 s}{2\pi})^2=100.2 kg[/tex]

The displacement from point A to point B is the length of the shortest path between them along with the direction from A to B.

Choice D

When a body is moving on a linear path, the displacement is the shortest path between two points, including both distance and direction. The correct option is D.

The distance is the total path traveled by the particle or an object on a linear path.

When the particle has moved from point A to B straight on the path, the distance is equal to the displacement. When the particle takes a U turn or deflects from the path to left or right or any direction, the displacement is less than the distance. The displacement is measured as the distance between the initial and final point.

Thus, when a body is moving on a linear path, the displacement is the shortest path between two points, including both distance and direction. The correct option is D.

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Answer: The answer is C. 4.9 sec.

Explanation:

Answer:

c) 4.9 s

Explanation:

Young's modulus of aluminium is given as

[tex]Y = 69 \times 10^9 pa[/tex]

density of aluminium is given as

[tex]\rho = 2700 kg/m^3[/tex]

now the speed of sound in aluminium is given as

[tex]v = \sqrt{\frac{Y}{\rho}}[/tex]

[tex]v = \sqrt{\frac{69 \times 10^9}{2700}}[/tex]

[tex]v = 5055.3 m/s[/tex]

now the time taken by the sound to travel a distance of d = 25 km

[tex]t = \frac{d}{v}[/tex]

[tex]t = \frac{25 \times 10^3}{5055.3}[/tex]

[tex]t = 4.9 s[/tex]

Answer:

Multiple transformations occur because the chemical energy of the fuel is changed to several forms of energy

Explanation:

In a car engine, multiple energy transformation takes place. The chemical energy storef in fuel is transformed into mechanical energy which helps move the wheels of the vehicle.

The mechanical energy can also be transformed into electrical energy through a sort of dynamo system in vehicles. Stereo players use the electrical energy to produce sound.

We see that multiple energy conversions are common in a motor car.

Answer:

c

Explanation:

edge

Answer:

200000 cm are in 2 km

Explanation:

Answer:

200000 cm are in 2 km

hope this helps pls make this the brainliest

Answer:

A would definately be the correct answer

Explanation:

Answer: A. Proteins expressing color in butterfly wings mutate to create camouflaging abilities of butterflies.

Explanation:

Adaptation can be define as the changes occurring in living organisms in their physiology, morphology, and genomic. These adaptations allow organisms to survive in adverse environment.

A. is the correct option. It is an example of physiological adaptation. The color of butterfly wings will change due to protein expression. Thus help in camouflaging the predators by color change.

If the voltage impressed across the ends of the circuit were doubled then its new current would be 120 milliAmps

Ohm's law claims that the voltage across a conductor is directly proportional to the current flowing through it.

This current-voltage connection may be expressed mathematically as,

The Equation of Ohm's Law is given as;

[tex]\rm V=IR \\\\ I=\frac{V}{R} \\\\[/tex]

If the resistance is constant. The current is directly propotional to the voltage;

If the voltage value is doubled the value of the current in the circuit ios is also doubled. The value of the new current will be;

[tex]\rm I' = 60 \times 2 \\\\ \rm I' = 120 \ mA[/tex]

Hence if the voltage impressed across the ends of the circuit were doubled then its new current would be 120 milliAmps

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Final answer:

According to Ohm's Law, if the voltage in a circuit is doubled while the resistance remains constant, the current would also double. Therefore, if the initial current is 60.0 milliAmps and the voltage doubles, the new current would be 120.0 milliAmps.

Explanation:

The question deals with Ohm's Law, which is a fundamental principle in physics that describes the relationship between voltage, current, and resistance in an electrical circuit. According to Ohm's Law, the current in a circuit is directly proportional to the voltage across it and inversely proportional to the resistance of the circuit. Thus, if the voltage in a circuit is doubled while the resistance remains constant, the current would also double.

Given that the initial current in the wires of a circuit is 60.0 milliAmps, and if the voltage impressed across the ends of the circuit were doubled without any change in its resistance, the new current would be 120.0 milliAmps.

Answer:

age structure

Explanation:

The variable would be most useful in determining the number of people eligible for retirement benefits in a certain year is age criteria.

When an employee reaches his age of retirement from work, he needs to stay at home and perform no work in organization.

So, the age criteria is an important factor to decide the retirement of a person. He is then eligible for all the retirement benefits offered by the private sector organization or government.

Thus, variable would be most useful in determining the number of people eligible for retirement benefits in a certain year is age criteria.

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Answer:

The total charge that passes through the player in 900s is Δq = 108C

Explanation:

Charge and current

The concept of electric charge is the fundamental principle to explain all electrical phenomena. Also, the basic quantity in an electrical circuit is the electric charge. All people experience the effect of electric charge when they try to take off a wool sweater and it is stuck to the body or when they go through a carpet and receive an electric shock.

Charge is an electrical property of the atomic particles of which matter is composed, measured in coulombs (C).

Electric current is the rate of change of the load with respect to time,  measure in amperes (A).

Mathematically, the relationship between current i, charge q and time t is:

i = dq/dt

Δq = i Δt

Δq = 0.120A x 900s = 108C

Answer:

Blue-green bacteria or cynobacteria belong to the kingdom Monera

Blue-green bacteria belongs to the kingdom

a. Monera.

Answer:

800 N/C to the right

Explanation:

The relationship between electric force, electric field and charge is

[tex]E=\frac{F}{q}[/tex]

where

E is the electric field

F is the force acting on the charge

q is the charge

In this problem, we have

[tex]F = 0.040 N[/tex] is the force

[tex]q=+50 \mu C=+50 \cdot 10^{-6}C[/tex] is the charge

Substituting into the formula, we find the electric field magnitude

[tex]E=\frac{0.040 N}{+50 \cdot 10^{-6}C}=800 N/C[/tex]

Concerning the direction:

- The electric field and the force have same directions if the charge is positive

- The electric field and the force have opposite directions if the charge is negative

Here the charge is positive, so the electric field has same direction as the force: therefore, to the right.

I believe it is the Cassiopeia. It is visible during winter in the early part of the night. It look like a distorted letter W or M.

I am not very sure of it though, I apologize if this is not what you meant.

Answer:

Ursa Minor Constellation

Explanation:

Ursa Minor constellation lies in the northern sky. The constellation's name means “the smaller bear,” or “the lesser bear,” in Latin. The Great Bear constellation is represented by its larger neighbor Ursa Major.

The answer is: B a meteorite

The answer is B which is a meteorite.

Answer:

Explanation:

That is exactly what it does. That's how it is set up.

True

An electrocardiogram (ECG or EKG) is a diagnostic tool used to record the electrical activity of the heart. It involves the use of an electrocardiograph and electrodes. However, it has certain limitations and cannot reveal the effectiveness of the heart's pumping action.

An electrocardiogram (ECG), also often abbreviated as EKG, is a recording of the electrical activity of the heart that can be used to diagnose irregular heart function. Through the placement of surface electrodes on the body, the complex, compound electrical signal of the heart can be recorded. These signals are created from the processes of depolarization and repolarization, especially in the heart.

The standard electrocardiograph uses between 3 and 12 leads to capture this information. These leads may refer to the cables from the electrodes to the electrical recorder, but typically, it refers to the voltage difference between two electrodes. Sometimes, a patient might need to wear a portable device known as a Holter monitor to continuously monitor the heart's electrical activity.

It's important to note that the ECG has limitations. For instance, not all areas suffering a myocardial infarction (MI) may show up on the ECG. It also will not reveal the effectiveness of the heart's pumping action, which requires further tests such as an echocardiogram or nuclear medicine imaging.

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Answer:

paper burned and turned into smoke...

Explanation:

When a chemical reaction has taken place that means that whatever the starting variable is, (in this case it was the paper) then it cannot go back to its original state... you can also tell if a chemical reaction has taken place if the test releases any kind of gas, if there is a temperature change, or if there is a color change. Which this time it changed from paper into smoke which is a gas

Hope This Helps

Answer:

paper burned and turned into smoke

Explanation:

Because it changes how i looks and the chemichals change.

Answer:

A. polymerization

Explanation:

Synthetic plastics are made by linking many simple carbon molecules together to form much larger molecules. This process is called polymerization.

Synthetic or artifical giant molecules consists of synthetic polymers such as plastics, elastomers etc. They are made up of simple monomers which links to form the complex and giant structure.

Monomers are the simplest unit of polymers. Polymers have very great sizes. The size mkaes their structure quite complex. This makes the molecules more disposed in a regular pattern with respect to one another.

The complexity of structure and the attendant effects accounts for the properties and uses that makes synthetic molecules very unique. For example, plastics can be extruded as sheets, pipes and or moulded into other objects.

Answer:

A. Polymerization

Explanation:

Penn Foster

Answer:

2.25 N upwards

Explanation:

Answer:

800 N/C to the right

Explanation:

The equation that relates force on a charge, electric field and charge is

[tex]F=qE[/tex]

where

F is the force acting on the charge

q is the charge

E is the electric field

In this problem, we have

[tex]E=15 N/C[/tex] is the electric field

[tex]q=-0.15 C[/tex] is the charge

Substituting into the formula, we find the force

[tex]F=(-0.15 C)(15 N/C)=-2.25 N[/tex]

Concerning the direction:

- The electric field and the force have same directions if the charge is positive

- The electric field and the force have opposite directions if the charge is negative

Here the charge is negative, so the electric field has opposite direction to the force: therefore, it must be upwards.

Answer:

0.4 m/s

Explanation:

First of all, let's find the frequency of the wave, which is equal to the reciprocal of its period:

[tex]f=\frac{1}{T}=\frac{1}{5 s}=0.2 Hz[/tex]

Now we can find the wave speed using the formula:

[tex]v=f\lambda[/tex]

where

f = 0.2 Hz is the frequency

[tex]\lambda=2 m[/tex] is the wavelength

Substituting, we find

[tex]v=(0.2 Hz)(2 m)=0.4 m/s[/tex]

Answer:

the Hudson Bay was covered with alpine glaciers

Explanation:

During the last glacial period, large portions of North America were covered with ice. The majority of the ice was from the ice sheets that were covering Canada and the northern part of the United States, and the alpine glaciers on the mountain ranges. Hudson Bay was all frozen at this point of time. It was not covered with alpine glaciers though, instead it was covered with the ice of the extended ice sheets, with the ice cover reaching up to 2 km in thickness.

Answer:

Hypocalcemia is the correct answer.

Explanation:

This disease, hypocalcemia, is usually known as calcium deficiency disease, which happens when calcium levels in the blood are low. If this disease is not taken care of properly, it can lead to cataracts, alteration in the brain, or even osteoporosis (the bones become brittle.)

Answer:

18 m, 7.9 m

Explanation:

In the y direction:

y = y₀ + v₀ᵧ t + ½ aᵧ t²

0 = 0 + (v₀ sin 45°) t + ½ (-g) t²

0 = t (v₀ sin 45° - ½ g t)

t = 0, t = 2v₀ sin 45° / g

In the x direction:

x = x₀ + v₀ t + ½ at²

x = 0 + (v₀ cos 45°) t + ½ (0) t²

x = v₀ cos 45° t

Substituting for t:

x = v₀ cos 45° (2v₀ sin 45° / g)

x = v₀² / g

When g = 9.80 m/s², x = 3.0 m:

3.0 = v₀² / 9.80

v₀² = 29.4

On the moon, when g = 9.80/6:

x = 29.4 / (9.80 / 6)

x = 18 m

As you can see, x is inversely proportional to g, so 1/6 the gravity means 6 times the distance.  So on Mars:

x = 3 / 0.38

x = 7.9 m

Answer:

Zeros to the left of a decimal can be insignificant place holders, such as in 0.043 (two significant figures).

They can be significant if they are between two digits who themselves are significant, such as in 101.000 (three significant figures).

In the case of a number like 1,000 we can see there is only one significant figure. The zero digits are not between sigfigs.

Answer:

Zeros to the left of a decimal can be insignificant place holders, such as in 0.043 (two significant figures).

They can be significant if they are between two digits who themselves are significant, such as in 101.000 (three significant figures).

In the case of a number like 1,000 we can see there is only one significant figure. The zero digits are not between sigfigs.\

Answer:

Because the gravitational attraction of the Sun hold them in motion around it

Explanation:

For an object travelling in a straight path at constant velocity, the net force acting on the object must be zero.

The planets in the Solar System, however, do not experience a zero net force: in fact, the Sun exerts a gravitational attraction on them, whose magnitude is given by

[tex]F=G\frac{Mm}{r^2}[/tex]

where

G is the gravitational constant

M is the mass of the Sun

m is the mass of the planet

r is the average distance between the Sun and the planet

Due to the presence of this force, the Sun makes the planets 'deviating' from their straight path, forcing them to following an elliptical path around the Sun.

1. Rocks near mid-ocean ridge were younger than rock near trenches. Rocks away from the mid-oceanic ridges are relatively older than those near it.  

Additionally, the older rocks are denser and thicker compared to thinner and less dense rocks near the mid-oceanic ridge.

2. Matching bands of magnetic rocks were found on either side the mid-ocean ridge; bands like tree rings - record changes in earth's magnetic field over time.

This means sea floor contains different rocks based on ages and are positioned equally in opposite directions. This indicates that there is constant movement and spreading of rocks on the ocean floor.

3. Earthquake data showed oceanic crust is sinking on to the mantle at trenches.  

Keywords: Seafloor spreading, evidence of seafloor spreading  

Level: High school  

Subject: Geography  

Topic: Geology  

Sub-topic: Seafloor spreading  

The main evidence for sea-floor spreading comes from several sources of geological and geophysical data, which collectively support the idea that new oceanic crust is continually forming at mid-ocean ridges and spreading away from these ridges over time.

Some of the key evidence for sea-floor spreading includes:

1. Oceanic Bathymetry: The mapping of the ocean floor using sonar and other techniques has revealed the existence of mid-ocean ridges, underwater mountain ranges that extend for thousands of kilometers through the world's oceans. These ridges exhibit a symmetrical pattern of magnetic anomalies on either side, indicating a continuous process of seafloor spreading.

2. Paleomagnetic Evidence: Scientists have discovered that the rocks making up the ocean floor contain records of the Earth's past magnetic field. As the magma cools and solidifies at mid-ocean ridges, magnetic minerals within the rocks align with the prevailing magnetic field at the time. By studying the magnetic orientation of these rocks, scientists found that the magnetic patterns are symmetrical on either side of mid-ocean ridges, supporting the idea of sea-floor spreading.

3. Age of Oceanic Crust: Radiometric dating of rock samples collected from the ocean floor reveals that the rocks get progressively older as one moves away from mid-ocean ridges. The youngest rocks are found near the ridges, while the oldest rocks are located farther away. This age progression is consistent with the idea of seafloor spreading, where new crust is continuously formed at the ridges and moves away from the center.

4. Magnetic Reversals: The study of magnetic anomalies in the oceanic crust has revealed periods of magnetic reversal, where the Earth's magnetic field has flipped in the past. These magnetic reversals are recorded in the ocean floor rocks as bands of alternating magnetic orientations. The symmetrical pattern of magnetic anomalies on either side of mid-ocean ridges is evidence of the spreading of oceanic crust and the preservation of these magnetic records.

5. Earthquake and Volcanic Activity: Seismic activity, including earthquakes and volcanic eruptions, is concentrated along mid-ocean ridges, indicating the presence of tectonic activity and the upwelling of magma to form new oceanic crust.

By considering these lines of evidence together, scientists have developed the theory of sea-floor spreading, which forms an essential part of the broader theory of plate tectonics, explaining the movement of the Earth's lithospheric plates over geological time scales.

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An electromagnet is a type of magnet in which the magnetic field is produced by an electric current. It behaves exactly like a permanent magnet, like those magnets commonly used to stick items to our fridge.

To make a permanent magnet we need:

- One iron nail ( Could be fifteen centimeters (6 in) long )

- Three meters (10 ft) of copper wire

- One or more D-cell batteries

To make the electromagnet, we need to:

1. Wrap the Wire Around the Nail

2. Connect the Battery

And you are all set!

Answer:

i think it is c

Explanation:

Answer:its plywood

Explanation:i just took the test

Answer:

Correct answer is option C (Brahe and Kepler.)

Explanation:

Copernican model

Copernican model is also known as heliocentric model. According to Copernican model planets rotate around the Sun in an orbit, and earth is orbited  by the Moon. Also sun is  stationary and it lies at the center of the universe and stars also do not move.

Brahe supported the Copernican model  but  he  rejected the idea that earth moves.

Kepler's also supported Copernican model and In his book "the Mysterium Cosmographicum" Kepler appreciated Copernican model. like Kepler also believed in heliocentric model not in  geocentric one.

Answer:

C. Brahe and Kepler

Explanation:

got 100% on pf--- :)))

Answer:

Electric charge

Like; opposite

Faster

True

True

positive to negative

Explanation:

i believe it's C but i'm not completely sure

The answer is a change in the direction of light when it goes from one medium into a different medium.