What force is needed to keeps 20kg box moving at a constant velocity when the mk is 0.3021 and the force is applied level to the ground

As the kinetic energy of the object becomes 4 times when speed of it changes from v to 2v, s it takes four times the amount of work to increase its speed from rest to a speed of 2v.

According to the definition of kinetic energy in physics, it is the amount of work that an item may accomplish while in motion.

As a scalar quantity, kinetic energy can only be fully defined by its magnitude.

Let the mass of the object is = m.

When its speed is v, kinetic energy of it: E₁ = 1/2 × mv²

When its speed is 2v, kinetic energy of it: E₂ = 1/2 × m(2v)²

= 4 × 1/2 × mv²

= 4 E₁

As the kinetic energy of the object becomes 4 times when speed of it changes from v to 2v, s it takes four times the amount of work to increase its speed from rest to a speed of 2v.

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Number 1 is correct.

The amount of power has decreased. This is most likely the result of

A. less work being done over a longer period of time.

Power is defined as work divided by time, or P = W / t. Therefore, as work increases and time decreases power increases.

Performance is the speed at which work is completed. The rate in this case means per unit time. Performance is calculated by dividing the work done by the time it takes to complete the work.

As already mentioned, performance is the speed of work. Therefore, it can be calculated by dividing the work done by the time. The formula for power is: Where P is the power, W is the work done, and t is the time required.

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To determine if a chemical reaction represents a single displacement reaction or a double displacement reaction, examine the reactants and products. Single displacement reactions involve the replacement of an element in a compound, while double displacement reactions involve the exchange of ions between two compounds.

In order to determine if a chemical reaction represents a single displacement reaction or a double displacement reaction, you need to examine the reactants and products in the reaction equation.

For a single displacement reaction, one element is replaced by another element in a compound. This can occur when a more reactive element displaces a less reactive element. An example of a single displacement reaction is the reaction between zinc metal and hydrochloric acid:

Zn(s) + 2HCl(aq) → ZnCl2(aq) + H2(g)

On the other hand, a double displacement reaction involves the exchange of ions between two compounds. This can result in the formation of a precipitate or a gas. An example of a double displacement reaction is the reaction between sodium sulfate and barium chloride:

Na2SO4(aq) + BaCl2(aq) → 2NaCl(aq) + BaSO4(s)

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Is it possible to do work on an object that remains at rest? Work requires that a force acts over a distance. If an object does not move at all, there is no displacement, and therefore no work done.

Final answer:

Work in physics typically involves a force causing displacement, so no work is done on a resting object if there's no movement. However, internal work can be done on a deformable system that doesn't result in displacement, such as bending or compressing an object, which alters its internal energy.

Explanation:

In physics, the concept of work is defined as the process of transferring energy by the application of force along the direction of displacement of the object. According to this definition, if an object does not move, no work is done on it, even if a force is applied. This is because work is calculated by the equation W = F × d × cos(θ), where W is work, F is the force applied, d is the displacement, and θ is the angle between the force and the direction of displacement. Therefore, if d (displacement) is zero, the work done is also zero.

However, there are cases in deformable systems where net work can be done without causing a change in the mechanical kinetic energy. Such scenarios include the bending of a coat hanger or the compression of a gas where internal work is done on the system to alter its shape or volume rather than its movement, thus maintaining a state of rest even though internal energy may have changed.

In summary, if we're considering mechanical work related to movement against forces like gravity, and if the object remains at rest, then no work has been done on that object. However, it is important to note that work can be performed in other forms, such as internal work in a deformable system that does not result in a change in the object's position.

D in regions near the equator

In order to determine the velocity, you must know the direction and speed option (2) the direction and speed is correct.

Distance is a measurement of the separation between two things or places. When we talk about distance, we're talking about a physical length or an estimate based on other physics or practical usage factors.

It is given that:

In order to determine the velocity, you must know:

The options are:

As we know,

A vector quantity is a velocity. It is characterized as a movement per instant.

Distance in a specific direction is known as dispersion, when an entity travels in a certain direction, such straight line, velocity can also be related to speed.

Thus, in order to determine the velocity, you must know the direction and speed option (2) the direction and speed is correct.

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Answer:

Factors affect the projectile motion are

1. Gravity

2. Air resistance

3. Angle of release

4. Speed of release, etc.

1. Gravity: affect gravitational force, g= 9.81 m/s2

2. Air resistance  : Resists the motion of objects, acts in opposite direction.

3. Angle of release: This refers to the angle that the object thrown.

4. Angle of release ; In sporting situations angle of release varies according to the activity.

Answer:

Initial velocity and launch angle

Explanation:

An object thrown into space is known as projectile. The motion of the object is known projectile motion. The projectile motion depends on the initial velocity and the launch angle. The horizontal velocity remains same. The object accelerates vertically downwards due to gravity.

Range, [tex] R = \frac{u^2sin2\theta}{g}[/tex]

Maximum height, [tex]H =\frac{u^2 sin^2\theta}{2g}[/tex]

the answer is B. hope this helps

Given data

mass (m) =8 Kg ,

speed (v) =10 m/s ,

time (t) = 5 s

determine magnitude of force (Fnet) = ?

                    we knoe that

                                        Fnet = m.a

                                                 = 8 × (v/t)       since a = v/t

                                                 = 8 × (10/5)

                                                 = 16 N

Magnitude of net force is 16 N

It takes Earth about 24 hours to rotate once on its axis. The movement of one object around another object is called revolution. ... Earth's path as it revolves around the sun is called its orbit. Earth's orbit is a slightly elongated circle, or ellipse.

Answer:

The fore-brain consists of the cerebrum, thalamus, and hypothalamus. Mid-brain relays information between fore-brain and hind-brain. Mid-brain plays important role in developing motor functions like eye movement, auditory functions and visual processing.  The crus cerebri connects the cerebral hemispheres to the cerebellum, contains a portion having a network of neurons that is responsible for arousal and alertness.

Thermal energy comes from moving particles

By making particles go faster, you increase the kinetic energy creating heat.

The height and speed of a rocket that starts from rest and undergoes variable acceleration can be found by integrating the acceleration function to obtain velocity and position as functions of time, and then solving for the specific conditions given in the problem (at t = 10.0 s and when the rocket is 325 m above the Earth's surface).

The question involves an upward movement with an acceleration given by a(t) = A - Bt²/2. We are to find the height of the rocket above the surface of the Earth at t = 10.0 s and the speed of the rocket when it is 325 m above the surface of the Earth.

To find the height, we integrate the acceleration equation with respect to time to get the velocity equation and then integrate again to get the position equation. Given the initial conditions that the rocket starts from rest, we can find the height by integrating the acceleration function.

To find the speed at a certain height, we need to use conservation of energy or integrate the acceleration function to get velocity as a function of time and then solve for the time at which the rocket reaches 325 m. Once the time is known, it can be substituted back into the velocity function to find the speed of the rocket at that height.

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Based on the ideal gas equation, the pressure (P), volume (V) and temperature (T) corresponding to n moles of an ideal gas are related as:

PV = nRT

where R = gas constant

Under conditions of constant pressure and  number of moles:

The volume is directly proportional to the pressure. Therefore, as the temperature drops the volume will also decrease.

V α T

This is also known as the Charles Law.

Answer: d, All of the above.

    It states that "Every object will remain at rest or uniform motion unless compelled to change its state by the action of an external force".  

 All the choices a, b, c and d are explaining the newtons I law and proving above statement.

I would like to believe that people are most likely to be obedient to rules that benefit the common good of others (C).

Sadly, I don't.

Perhaps I've become cynical because of my age.  But, without seeing any psychological analysis or survey data on the subject, my opinion is that people are more likely to be obedient to rules that benefit only themselves (D).

People are most likely to be obedient to rules that benefit only themselves. This is because in the end, everyone is selfish by nature.

Answer: D. benefit only themselves

shoutout to: the AL2006 above, who answered first

none; live

Answer:

Generator.

Generator is the essential element used to convert Mechanical energy to Electrical energy.

For example, a shaft rotates in the generator, produces EMF.

An object with equal amounts of positive and negative charge is called neutral object.

"Electric Charge is a property of subatomic particles that causes them to experience a force when they are placed in an electric and magnetic field." Positive and negative electric charges are commonly carried by charge carriers protons and electrons.

A scalar quantity is an electric charge. A vector quantity, in addition to having a magnitude and a direction, must also obey the laws of vector addition, such as the triangle law of vector addition and the parallelogram law of vector addition; only then is the quantity said to be a vector quantity.

Subatomic particles or matter particles are examples of charge types:

Any object with equal amounts of positive and negative charge is called neutral object.

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it happens when  water seeps into cracks

Answer: C

Gauge pressure = 156 kPa ,

What is absolute pressure =?

     We know that,

      absolute pressure = gauge pressure + atmospheric pressure

                           Pabs = Pgauge + Patm

                                     = 156 + 101.3             (since atm.pr. = 101.3 Kpa)

                                     = 257.3 KPa absoulte

                                     approximately  = 256 KPa absolue

Answer:  

During constructive interference occurs at any location along the medium  where two inferring waves are in the same direction. In this case both waves have upward displacement. Consequently the medium has an upward displacement has that is greater than the displacement of inferring pulses.

i think it's Precambrian

Answer:

Work done by the machine (W) =  500 × 1.5 = 750 J

Work supplied to the machine (W) = 100 × 10 = 1000 J

              Here, work supplied to the machine is input work = 1000 J

Final answer:

To calculate the change in kinetic energy, we can use the equation KE = ½ mv², where KE is the kinetic energy, m is the mass, and v is the velocity. For a 50 kg ball traveling at 20 m/s, the kinetic energy would be 10,000 J. For a 50 kg ball traveling at 5 m/s, the kinetic energy would be 625 J. For a 50 kg person falling at 10 m/s, the kinetic energy would be 2,500 J.

Explanation:

To calculate the change in kinetic energy, we can use the equation for kinetic energy: KE = ½ mv², where KE is the kinetic energy, m is the mass, and v is the velocity.

For example, for the 50 kg ball traveling at 20 m/s, the kinetic energy would be:

KE = ½ (50 kg) (20 m/s)² = 10,000 J

Similarly, for the 50 kg ball traveling at 5 m/s, the kinetic energy would be:

KE = ½ (50 kg) (5 m/s)² = 625 J

And for the 50 kg person falling at 10 m/s, the kinetic energy would be:

KE = ½ (50 kg) (10 m/s)² = 2,500 J

Average Velocity= displacement/time   Av=50/0.50   Av=100

formed by the process of glaciation.

Eventually, the water will all evaporate in this way. The energy which is lost as the particles evaporate is replaced from the surroundings. As the molecules in the water jostle with each other, new molecules will gain enough energy to escape from the surface.

Answer: b: "There is no air for it to evaporate into."

Explanation: If the jar is closed, and filled with water (and it is not heated or nothing like that) the system doesn't suffer any change in his extensive properties nor intensive properties. Now, suppose that there is some energy applied to the water, and it wants to evaporate, this would imply a change in the volume (the volume of the vapor is bigger than the volume of the liquid water) then you will need some free space to evaporate a fraction of water, but there is no free space (the jar is completely filled with water and closed) so there is no space to evaporation. If you give enough energy to the jar, it eventually will break to release this energy.

Then the right answer is b: "There is no air for it to evaporate into."

Answer:

All of the above options describes the biogeochemical and geochemical cycles.

Explanation:

The geochemical and biogeochemical cycles process the harmful substances in our planet like unwanted chemical from industries and plastic to be converted into new recycled components to be used harmless to the nature.

The biogeochemical and geochemical cycles are very vital because they play major role in regulating the essential elements that is needed for sustaining life in earth. This is achieved through various physical and chemical processes like carbon cycle, water cycle, nitrigen cycle etc., They also helps the dead organisms to bio degrade.

Differences:

An electrical motor converts electrical energy into mechanical energy,where as a generator converts mechanical energy into electrical energy.

The principle of a electric motor if there is a change of the magnetic field across a conductor  electrons are forced to move in a direction perpendicular to the direction of the magnetic field,where as in a generator if a charge is moving in a magnetic field, a force acts on the charge in a direction perpendicular to both the velocity of the charge and the magnetic field.

similarities:

Both electric motor and generator work on the magnetic effects of electric current.

Both have the armatures to rotate the loop.

An electromotor and generator have similar structures involving wire loops and magnetic fields. However, an electromotor converts electrical energy to mechanical, while a generator performs the opposite conversion - mechanical to electrical.

Both an electromotor and a generator have similar structures and both involve interactions between magnetic fields and current-carrying wires to function. However, they perform opposite energy conversions.

An electromotor, or electric motor, converts electrical energy into mechanical energy. This operates by passing an electrical current through wire loops within a magnetic field. The magnetic field exerts a force on the current-carrying wires, resulting in a rotational motion.

On the other hand, a generator converts mechanical energy into electrical energy. It functions by rotating wire loops within a magnetic field, which causes an alternating current to form. Sources of the mechanical energy that rotates the loops can include hydropower, wind energy, or the release of steam in a turbine system.

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Given that:

spring compressed ( x) = 0.2 m

                        Work (W) = 24 J

 determine , spring constant (x)=?

               We know hat ,

                      Work   (W) = (1/2). k.x²

                                   24 = 1/2 ( k × 0.2²)

                                     48 = k × 0.2²

                                      k = 1200 N/m