a child riding a bicycle at 15 meters per second accelerates at -3,0 meters per second? for 4.0 seconds. What is the child's speed A at the end of this 4.0-second interval? (with work, all steps))

Sure! Here are the steps for calculating the velocity and distance traveled by the car after 50 seconds :

Step 1: Calculate the velocity using the equation:

\(v = u + at\)

where:

- \(v\) is the final velocity

- \(u\) is the initial velocity (0 m/s, as the car starts from rest)

- \(a\) is the acceleration (3 m/s²)

- \(t\) is the time (50 seconds)

Substituting the values into the equation:

\(v = 0 + (3 \, \text{m/s²}) \times (50 \, \text{s})\)

Step 2: Calculate the distance traveled using the equation:

\(s = ut + \frac{1}{2}at^2\)

where:

- \(s\) is the distance traveled

- \(u\) is the initial velocity (0 m/s)

- \(a\) is the acceleration (3 m/s²)

- \(t\) is the time (50 seconds)

Substituting the values into the equation:

\(s = 0 \times (50 \, \text{s}) + \frac{1}{2} \times (3 \, \text{m/s²}) \times (50 \, \text{s})^2\)

Now, let's simplify these equations:

\(v = 3 \times 50\)

\(s = \frac{1}{2} \times 3 \times 50^2\)

Calculating the results:

\(v = 150\) m/s

\(s = 3750\) meters

Therefore, after 50 seconds, the car will have a velocity of 150 m/s and would have traveled a distance of 3750 meters.

“The electric flux through a closed surface is equal to the net charge inside the surface divided by the physical constant. This law is a fundamental principle in electrostatics and is expressed mathematically as E.ds = Q/ε0.

Gauss’s Law for electric fields is a fundamental principle in physics, specifically in the study of electrostatics. The law describes the relationship between the electric flux and the distribution of electric charges in a given space. Simply put, it states that the electric flux through a closed surface is proportional to the total amount of electric charges inside the surface. In mathematical terms, the statement of Gauss’s Law for electric fields is as follows: E.ds = Q/ε0Here, E.ds represents the electric flux through a closed surface, Q represents the total electric charge enclosed within the surface, and ε0 is the physical constant known as the permittivity of free space. This equation can be used to calculate the electric field created by a given charge distribution, provided that the electric flux through a closed surface around the distribution is known.

Gauss’s Law for electric fields states that the electric flux through a closed surface is proportional to the net electric charge enclosed within the surface. This law is a fundamental principle in electrostatics and is expressed mathematically as E.ds = Q/ε0.

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I think its "a dropped penny sinks at the bottom of a pond". Because, non-contact force is a force that you don't touch, like gravity or weight, that falls but you didn't drop it on purpose nature did or gravity itself did.

When Frank exerts push with a force of 620 N over a filing cabinet with a mass of 60 g. The cabinet doesn’t move. it can be inferred that The static friction force of the floor and cabinet is greater than 620 N.

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The complete question is :

Frank pushes with a force of 620 N on a filing cabinet with a mass of 60 g. The cabinet doesn't move.

What can be inferred?

A. There are no other forces acting on the filing cabinet.

B. The static friction force of the floor and cabinet is greater than 620 N.

C. The net force of the cabinet is greater than 620 N.

D. The friction force of the floor and cabinet is less than 620 N.

Answer: Substance 3 is liquid at room temperature

Explanation: The common room temperature is assumed to be 20-22°C, we need to find the substance that will be in liquid state in that temperature.

For Substance 1, the boiling point is -195.975°C, and hence at room temperature, it would be in vapor phase and all liquid would have turned to gas.

For Substance 2, the boiling point is 3.85°C, and hence at room temperature, it would be in vapor phase and all liquid would have turned to gas in this case too.

For Substance 3, the boiling point is 77.85°C, and melting point is -108.15°C, hence at room temperature, it would be in liquid state.

For Substance 4, the melting point itself is 1800°C, due to which at room temperature it would be in solid state.

Answer:

1.5x10^-4C

C=Couloumb's

Explanation:

Expression for the electric force between the two charges is given by -

F = (k*q1*q2) / r^2

Here, k = constant = 9 x 10^9 N*m^2 / C^2

F=25N

q1 = 1.9x10^-6 x 10^-6 C

q2 = ?

r = 0.32m

Substitute the given values in the above expression -

25N= 9x10^9 *1.9x10^-6 *q2 / 0.32m^2

25N= 17,100*q2 / 0.1024m

Next part is algebra     multiply both sides by 0.1024 to remove denominator

2.56=17,100*q2  

Divide both sides to isolate q2

q2= 1.5x10^-4C

Answer: its D

Explanation:

because the car is pulling it(trailer) to the left not the right

Answer:

1. C

2. B

3. B

Explanation:

Took assignment on edge

The

Answer:

It happened less than 8 hours ago.

Explanation:

Over the first eight hours, the body begins to stiffen but is still flexible.

Answer:

Explanation:

The force acting on an object given it's mass and acceleration can be found by using the formula

force = mass × acceleration

From the question we have

force = 84 × 6.4

We have the final answer as

Hope this helps you

Answer:

stop useing my awnsers just to deleate them

Explanation:

The correct pairing of vector quantity with its corresponding unit is (2) velocity and m/s. Velocity is a vector quantity that refers to the rate at which an object changes its position in a particular direction. It is expressed in meters per second (m/s), which is a combination of a length unit (meter) and a time unit (second).

(1) Weight and kg is an incorrect pairing because weight is a force, a vector quantity measured in newtons (N), not kilograms (kg). (3) Speed and m/s is also an incorrect pairing because speed is a scalar quantity that refers to the rate at which an object changes its position without regard to the direction. It is also expressed in meters per second (m/s), but it is not a vector quantity. (4) Acceleration and m²/s is an incorrect pairing because the unit of acceleration is meters per second squared (m/s²), not m2/s.

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During a 30-10 million year period starting at about 4.5 billion years ago, bits and pieces of metal-rich particles, rocks, and ices accumulated to form the earth.

This is referred to as a type of planet which is habitable for different types of life forms. It is also the third planet from the sun and a majority of it contains water such as oceans etc.

Earth was formed billions of years ago through the bits and pieces of metal-rich particles, rocks, and ices which was in a 30-10 million year period which therefore makes it the correct choice.

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The correct sequence of flow of electrical current in the cardiac conduction system is SA node, AV node, bundle of His, Purkinje fibers. This sequence can be found in option E.

Here is a brief explanation: The SA (sinoatrial) node initiates the electrical impulses that regulate the rhythm of the heartbeat. The electrical impulses from the SA node spread across the atria, causing them to contract. The AV (atrioventricular) node is the next point of the electrical conduction system, which slows the electrical signal as it passes through. The bundle of His is the pathway that conducts the impulses from the AV node to the ventricles, causing them to contract. The bundle of His divides into right and left branches, which travel along the interventricular septum towards the apex of the heart. The Purkinje fibers then carry the electrical impulses throughout the ventricles, causing them to contract in a coordinated manner.

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điện" (and any subsequent words) was ignored because we limit queries to 32 words.

Answer:

The star's luminosity rises above its previous level. Because it is so cool, the surface will be red, and it will be much farther away from the center than it was during the earlier stages of star evolution. Despite its lower surface temperature, the red giant has a large surface area, which makes it very luminous.

Answer:

a weak interaction between particles the result from mass

Pilots can prevent landing at the wrong airport or on the wrong runway by adhering to established procedures and employing various navigational aids.

Pilots can employ several measures to prevent landing at the wrong airport or on the wrong runway. Firstly, they should carefully review and follow established procedures provided by air traffic control (ATC) and the airport authority. This includes verifying the assigned runway and using the correct approach and landing charts. Secondly, pilots should make use of navigational aids such as instrument landing systems (ILS), global positioning systems (GPS), and visual aids like runway markings and signage.

These aids help pilots to accurately identify their intended destination and runway. Maintaining situational awareness throughout the flight is crucial, and pilots should cross-reference visual cues with navigational aids to ensure they are on the correct path. In cases of uncertainty or confusion, pilots should communicate with ATC to clarify any discrepancies or seek guidance. By diligently following procedures and utilizing navigational aids, pilots can significantly reduce the risk of landing at the wrong airport or on the wrong runway.

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When performing the swivel technique, one hand should be placed on the steering wheel, and the other should be placed over and behind the passenger seat.

The swivel technique is a method used by drivers to execute tight turns, typically in situations where there is limited space available or when maneuvering around obstacles.

To execute the swivel technique, the driver positions their hands strategically to facilitate the turning motion. The hand on the steering wheel allows them to control the direction of the vehicle, while the hand behind the passenger seat provides stability and support during the turn.

This positioning enables the driver to rotate the steering wheel smoothly and efficiently, maximizing control over the vehicle's movement.

It's important to note that the swivel technique requires proper coordination and caution to ensure the safety of the driver and any passengers.

Drivers should always adhere to traffic laws, adjust their speed accordingly, and be mindful of their surroundings when performing any driving maneuvers.

Additionally, it's recommended to practice the swivel technique in a controlled environment or under the guidance of a qualified driving instructor to develop proficiency in this driving technique.

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According to observers on Earth, it would take approximately 9.39 years for a spacecraft traveling at 0.980 times the speed of light (0.980c) to reach the star.

The time it takes for the spacecraft to reach the star, as measured by observers on Earth, can be calculated using time dilation. Time dilation occurs when an object is moving relative to an observer and causes time to appear to slow down for the moving object.

The formula for time dilation is given by:

t' = t / √(1 - (v^2/c^2))

where:

t' is the time measured by the observers on Earth,

t is the time experienced by the spacecraft,

v is the velocity of the spacecraft relative to Earth, and

c is the speed of light

In this case, the velocity of the spacecraft is given as 0.980c, where c is the speed of light. Plugging this value into the formula, we get:

t' = t / √(1 - (0.980c)^2/c^2)

Simplifying the equation, we have:

t' = t / √(1 - 0.9604)

t' = t / √(0.0396)

t' = t / 0.198

Therefore, the time experienced by observers on Earth is approximately 5.05 times longer than the time experienced by the spacecraft (t' = 5.05t).

If the distance to the star remains constant, the time it takes for the spacecraft to reach the star, as measured by observers on Earth, would be approximately 5.05 times longer than the time experienced by the spacecraft.

Assuming the distance to the star is 9.39 light-years, it would take approximately 9.39 years for the spacecraft to reach the star, as measured by observers on Earth.

Thus, it would take approximately 9.39 years for the spacecraft traveling at 0.980c to reach the star, as measured by observers on Earth.

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An ideal vapor compression refrigeration cycle operates without any losses or inefficiencies, while a practical vapor compression refrigeration cycle accounts for various real-world factors that affect the performance and efficiency of the system.

An ideal vapor compression refrigeration cycle and a practical vapor compression refrigeration cycle differ in the following ways:

Ideal Vapor Compression Refrigeration Cycle:

Operates without any losses or inefficiencies.

Assumes an ideal working fluid with no pressure drops or temperature differences during the compression and expansion processes.

Assumes perfect heat transfer during the condensation and evaporation processes.

Ignores factors such as compressor inefficiencies, refrigerant properties, and heat transfer losses.

Provides an idealized representation for theoretical analysis and understanding of the basic cycle.

Practical Vapor Compression Refrigeration Cycle:

Accounts for real-world factors and limitations that affect the performance and efficiency of the system.

Includes the effects of compressor inefficiencies, pressure drops in piping and components, and heat transfer losses in the condenser and evaporator.

Considers the properties and behavior of real refrigerants, such as their specific heat capacities, temperature glide, and pressure-temperature relationships.

Incorporates practical components and designs to address issues such as lubrication, control systems, and system reliability.

Reflects the actual performance and behavior of vapor compression refrigeration systems encountered in practical applications.

In summary, while the ideal vapor compression cycle provides a theoretical framework for analysis, the practical vapor compression cycle incorporates real-world factors and constraints to accurately represent the performance and efficiency of refrigeration systems in practical applications.

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Answer:

False

Explanation:

I'm not the most sure but it seems reasonable that it's false

Good Luck Bestie :3

Answer:

The answer is false. If you want why. I will desxribe you.

The ideal gas equation of state to calculate the final pressure of the system is PV = n .

Final pressure is a term used to describe the pressure at the end of a thermodynamic process, such as a cooling or heating cycle. It is the pressure that remains after all of the energy in the system has been converted into work. In other words, it is the pressure that is reached after all of the energy has been used up. Final pressure is a measure of the total energy in the system, including kinetic and potential energy. It is an important factor in determining the efficiency of a system and its overall performance.

The isothermal expansion of a system means that the temperature remains constant. Therefore, the initial temperature of 160°C is also the final temperature.The energy balance for this system is : Q + W = ΔU

Since the process is reversible, the work done by the system is equal to the change in enthalpy, which is given by the following equation:W = ΔH

Since the temperature remains constant, the change in enthalpy is equal to the change in internal energy: ΔH = ΔU

Substituting this into the energy balance equation, we get: Q + ΔH = ΔU

Substituting the known values, we get: 2700 kJ + ΔH = 0

Solving for ΔH, we get: ΔH = -2700 kJ.

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The ball becomes a projectile after the string snaps, falling to the ground at time t: t=0.495s since 1.20m=0+2 1 (9.80m/s2)t2. It moves at a steady 54.4 m/s horizontal speed.

Adherence to energy conservation The tension in the string will be such that it is just taut if the ball simply reaches the highest location with a velocity equal to zero.

Regardless of the object's velocity before the removal of the force (string), it will proceed straight ahead after the force is released. The ball will move in a straight line as a result of the string breaking.

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Answer:

i think answer is c

Explanation:

as formation water from steam condensed release heat

else all need heat

Answer:

Although expansion seems to imply a Big Bang, no other specific predictions of the Big Bang theory were tested and confirmed until the 1960s.  

Explanation:

Answer:

Today, the consensus among scientists, astronomers and cosmologists is that the Universe as we know it was created in a massive explosion that not only created the majority of matter, but the physical laws that govern our ever-expanding cosmos.  This is known as The Big Bang Theory. For almost a century, the term has been bandied about by scholars and non-scholars alike. This should come as no surprise, seeing as how it is the most accepted theory of our origins.

;)

Answer: c

Explanation:

I say "C" because we use technology to communicate over long distances instantly, so we have progressed in making rockets, shoes, health/high gene, etc.

          Technology is a branch of science which enables human life make easier with practical purposes. Technology improve human life in many way.  c,d ,e and f these all  improves human life by technology development.

Computers discovers new life to human life daily activities communication over the great distance , research and acess tons of information at fingertips. Computer has open source and cheap. Airplanes wipes the travel barrier for longer distance. We can travel longer distances with in hours.

Discovery of nearby galaxies gives lot of information about our galaxy shapes and nature of universe. One of best invention in human history is medical diagnostics, which enables human to detect diseases at early stages give better treatment to save life.

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The period of the pendulum is √2 seconds.

We need to know about pendulum experiments to solve this problem. The pendulum is a simple experiment to calculate gravitational acceleration. The gravitational acceleration can be calculated by

g = 4π² . L / T²

where g is gravitational acceleration, L is the length of the string and T is the period.

From the question above, we know that:

T1 = 1 s

L1 = 5 cm

L2 = 10 cm

By using proportionality, the squared period is proportional to the length. Hence,

T² ~ L

Using the ratio, we can write

T1² / T2² = L1 / L2

1² / T2² = 5 / 10

1 / T2² = 1 / 2

T2² = 2

T2 = √2 second

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