A 900kg car moving at 60m/s has approximately 320,000J of kinetic energy. Estimate it's new kinetic energy,if it is moving at 30m/s.​

Answer:

12 m

Explanation:

Work = change in energy

W = ΔE

Fd = ΔE

(4.0 N) d = 61 J

d = 15.25 m

Rounded to two significant figures, the distance the force would have to act over is 15 m, which is 12 m more than the 3.0 m it traveled.

Final answer:

To calculate the additional distance needed for the block to have 61 J of kinetic energy, we used the work-energy theorem and found that after applying a force of 4 N over 3 m, the kinetic energy is 12 J. An additional 49 J is needed, resulting in a requirement of an additional 12.25 m for the force to act upon.

Explanation:

To determine how much farther the force would have to act for the block to have 61 J of kinetic energy, we'll first use the work-energy theorem, which states that the work done on an object is equal to the change in its kinetic energy (KE). Initially, the block has 0 J of kinetic energy since it's at rest, and the work done by a constant force is W = F * d, where F is the force and d is the distance the force is applied over.

Since 4 N of force is applied over 3 m, the work done is:

W = 4 N * 3 m = 12 J

This means the kinetic energy of the block is now 12 J after the force has been applied for 3 m. To reach 61 J of kinetic energy, the block needs an additional:

KEneeded = 61 J - 12 J = 49 J

Now, we can find the additional distance (dadditional) required using the same work done equation:

49 J = 4 N * dadditional

dadditional = 49 J / 4 N = 12.25 m

Therefore, the force would have to act over an additional 12.25 m to give the block 61 J of kinetic energy.

Answer:

What are the choices?

Final answer:

Relative time determines the sequence of events without specific ages, while absolute time gives a precise measurement of age or date. Geologists use relative dating for stratigraphy and absolute dating for techniques like carbon dating. Time dilation in relativity illustrates that the rate of time is relative to the observer's motion.

Explanation:

The difference between relative time and absolute time lies in how they quantify the duration and sequence of events. Relative time refers to the sequence of events without assigning a specific age or date to them; it's a way to determine the order in which events have occurred. For instance, geologists use relative time to assert that one rock layer is older than another. On the other hand, absolute time or radiometric dating provides a precise measurement, giving an actual number or date to an event or object, such as specifying that a rock layer is 300 million years old.

These concepts are critical in fields such as geology, paleontology, and astronomy. In special relativity, the concept of time dilation shows that absolute time is not a fixed unit across all references, as the observed rate at which time passes depends on the observer's relative motion.

An example of relative dating would be using stratigraphy to understand that one geological layer is younger than the layer below it, while an example of absolute dating would be using carbon dating to determine the exact age of an archaeological object.

Answer:

B H2O.

Explanation:

Because H2O stands for hydrogen, which has the amount of 2. And O stands for oxygen, which is by itself. When you put that together it makes H2O.

The power required is 1.6 kW.

Answer:

Explanation:

Power is defined as the amount of work done on any object for a given time interval. In other words, power is the amount of force required to move an object in a given period of time.

Power = Work done / time taken for that work done.

Here the force is given as 800 N and the displacement is given as 2.5 m, while the time required for the displacement is given as 1.22 seconds.

So the power will be ratio of the  product of force acting on the weightlifter, displacement of the weight to the time taken for that displacement.

Power = (800×2.5)/1.22 =1639 W

So the power required is 1.6 kW.

A. It spins the opposite direction of most planets

Explanation:

Explanation:

the answer is true....maybe

Flexibility Leaders can able to adapt changes in circumstances and modify the way of approaching. Hence, the option A is correct.

Flexibility in leadership is the important quality for the leaders. It helps the leaders to adapt changes in their leadership style and serves the best for their team.

Flexible leaders can modify their style and way of approaching the situations. Those leaders can earn the trust of the people and encourage new ideas to increase productivity.

They can approach the situations in creative manner and incorporate new innovation and overcome the challenges.  Flexible leaders enhance the sustainable growth and profit.

Hence, Flexibility is a key characteristic for all leadership styles is True.

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Explanation:

a) Potential energy is weight times height.

PE = mgh

PE = (10.0 kg) (9.8 m/s²) (20.0 m)

PE = 1960 J

b) Energy is conserved.  As the block falls, potential energy is converted to kinetic energy.  Just before the block lands, all of the potential energy has been converted to kinetic energy.

KE = 1960 J

c) When the block has fallen half the distance, half the potential energy has been converted to kinetic energy.

KE = 1960 J / 2

KE = 980. J

d) Kinetic energy equals half the mass times the square of the velocity.

KE = ½ mv²

980. J = ½ (10.0 kg) v²

v = 14.0 m/s

Answer: small cars can stop and go fast big trucks can not

Explanation:

Answer:

1. Force = -623.43 N

2.Tension = 106.65 N

Explanation:

Let us call the bigger mass [tex]M[/tex], and the smaller mass [tex]m[/tex].

Since the two masses are connected to each other, they must experience same acceleration (if they didn't, the unequal acceleration will cause the string to break. )

From the free body diagram, the forces acting on the mass [tex]M[/tex] are

[tex]T - Mg-F_p[/tex],

and according to Newton Second Law, this causes acceleration [tex]a[/tex]; therefore,

(1).  [tex]\boxed{ T-Mg-F_p=Ma}[/tex].

Similarly, the forces acting on the mass [tex]m[/tex] are

[tex]T -mg[/tex],

which causes the acceleration [tex]-a[/tex] (upward); therefore,

[tex]T-mg=-ma \\[/tex]

or

[tex]\boxed{ mg-T = ma}[/tex]

From this equation we solve for [tex]T[/tex] and get:

[tex]T = mg-ma \\\\T =m(g-a).[/tex]

We put this into equation (1) and get:

[tex]m(g-a)-Mg-F_p=Ma[/tex]

[tex]F_p = m(g-a)-M(g+a)[/tex]

putting in [tex]M=62.4kg,m=13.5kg,[/tex] and [tex]a=1.9m/s^2[/tex], we get:

[tex]F_p=13.5(9.8-1.9)-62.4(9.8+1.9)\\\\\boxed{ F_p=-623.43N}[/tex]

The tension in the wire is

[tex]T =m(g-a)\\\\T = 13.5(9.8-1.9)\\\\\boxed{ T= 106.65N}[/tex]

Answer:

122.5 m

Explanation:

Given:

Time taken by apple to reach ground (t) = 5 s

Acceleration of the apple is due to gravity (g) = 9.8 m/s²

The displacement of the apple is equal to the height of window (h) = ?

As the apple is dropped, the initial velocity is, [tex]u=0\ m/s[/tex]

Now, using Newton's equation of motion along the vertical direction that relates displacement, initial velocity, acceleration and time taken, we have:

[tex]h=ut+\frac{1}{2}gt^2[/tex]

Plug in the given values and solve for 'h'. This gives,

[tex]h=0+\frac{1}{2}\times 9.8\times 5^2\\\\h=4.9\times 25=122.5\ m[/tex]

Therefore, the height of the window above the ground is 122.5 m.

Answer:

The big bang is a example of  scientific theory

Explanation:

The Big Bang is an example of a scientific theory about the origins and evolution of the universe. It has been substantiated through numerous tests and observations, specifically those related to the cosmic microwave background radiation and the expansion of the universe.

The 'Big Bang' is an example of a scientific theory. A scientific theory is an explanation for a range of phenomena that has been substantiated through repeated testing and observation. In this case, the Big Bang theory explains the origins and evolution of the universe. According to this theory, the universe originated from a singularity, a point of infinite density and temperature, about 13.8 billion years ago, and it has been expanding ever since. This theory is based on a wide range of observations, including those related to the cosmic microwave background radiation and the expansion of the universe.

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Answer:

(A) Mitosis

Explanation:

Mechanical waves are categorized into transverse, longitudinal, and surface waves. Transverse waves have disturbances perpendicular to wave direction, longitudinal waves have parallel disturbances, and surface waves are a combination of both.

Mechanical waves can be classified based on the type of motion involved in the wave's propagation. There are mainly two categories of mechanical waves, namely transverse waves and longitudinal waves. However, there is also a third category known as surface waves, which is a combination of both transverse and longitudinal motions.

Transverse waves are characterized by a disturbance that moves perpendicular to the direction of wave propagation. An example of a transverse wave is a wave on a string or an electromagnetic wave, such as visible light. Whereas, longitudinal waves have disturbances that move parallel to the direction of propagation, like sound waves in air or water.

Surface waves are typically observed in fluids, like water waves in the ocean, where the motion of the particles at the surface follows a circular path, thus involving both longitudinal and transverse motions.

Therefore, when considering the types of mechanical waves, the answer would be all of the above as it includes transverse waves, longitudinal waves, and surface waves.

Boiling water causes molecular movement to increase without breaking H₂O bonds. It's a physical change where molecules move farther apart as steam forms. Cooling steam back into water is reversible, showcasing the unique properties of water's hydrogen bonding.

When water undergoes a physical change, such as boiling, the arrangement of the water molecules changes due to increased kinetic energy. However, the chemical composition remains the same, meaning that the hydrogen and oxygen atoms do not separate into different atoms; they stay bonded as H₂O. The molecules move farther apart, transitioning from a liquid to a gaseous state without changing their actual molecular structure. This transformation requires the input of heat energy, and it is completely reversible; if the steam (water vapor) is cooled, it will condense back into liquid water, demonstrating one of water's unique characteristics due to its ability to form and break hydrogen bonds.

During the boiling of water, the hydrogen bonds between water molecules are broken as they gain enough kinetic energy to escape into the air as steam. When water freezes, however, these molecules form a crystalline structure that is less dense than liquid water, which explains why ice floats. This phenomenon is distinctive to water and differs from most other liquids, where the solid form is denser than the liquid.

Answer:

volume

Explanation:

Another term for amplitude is height. The maximum displacement that a longitudinal wave, like the sound wave.

The greatest movement of any point existing just on string from its location when the string would be at rest is used to determine the amplitude of a transverse wave, like the wave on such a string that's also plucked there. The maximum displacement that a longitudinal wave, like the sound wave, may make from its equilibrium position is used to determine the wave's amplitude.

A sound is a type of energy that's also created when objects vibrate. In most cases, a medium is necessary for the propagation of sound. As a result, we may conclude that sound cannot travel in a vacuum because there is nothing for the sound waves to travel through. Another term for amplitude is height.

Therefore, another term for amplitude is height.

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Answer:

carbon dioxide

Explanation:

Answer:

The direction of the force on a charged object moving through a magnetic field.

Explanation:

When considering the motion of a charged particle in a magnetic field, the important vectors are the magnetic field B, the velocity of the particle v, and the magnetic force exerted on the particle F. The vectors are all perpendicular to each other. As demonstrated by the right-hand rule.

Answer:12.28m/s

Explanation:

momentum of baseball =mass of baseball x velocity of baseball

Momentum of baseball =0.31x21

Momentum of baseball =6.51kgm/s

For a softball to have same momentum with the baseball we can say :momentum of baseball =mass of softball x velocity of softball

6.51=0.53 x velocity of softball

Velocity of softball =6.51/0.53

Velocity of softball =12.28m/s

The velocity of the softball that must be equal to the momentum of the baseball is 12.28 m/s.

The given parameters;

Apply the principle of conservation of linear momentum to determine the velocity of the softball;

[tex]m_1u_1 = m_2 u_2\\\\u_1 = \frac{m_2 u_2}{m_1} \\\\u_1 = \frac{0.31 \times 21}{0.53} \\\\u_1 = 12.28 \ m/s[/tex]

Thus, the velocity of the softball that must be equal to the momentum of the baseball is 12.28 m/s.

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Answer: D!

It is the option with the greatest amplitude.

Answer: The graph with the highest density of air.

Explanation: The graphs are missing, but il try to explain this problem anyways.

Soundwaves are mechanical waves, that need a medium to move (commonly, the medium is the air)

As those mechanical waves affect the air, the density of air in some areas increase and in others decrease, and when that "wave of air" impacts a receptor, like your ear, you receive the information of the sound, like pitch and intensity.

As more air impacts the receptor, more "loud" is the noise, and as you may know, density = mass/volume, so as biggest is the density of air in a point, this means that we have more mass of air at that point, which is directly related to the intensity or loudness of the sound wave at that point

Answer:

Explanation:

According to ohm's law

The current flowing through the wire is directly proportional to the potential difference applied across its ends , provided the temperature and other physical conditions of the wire like stresses and strains remains constant .

Answer:

The Milky Way is about 1,000,000,000,000,000,000 km (about 100,000 light years or about 30 kpc) across. The Sun does not lie near the center of our Galaxy. It lies about 8 kpc from the center on what is known as the Orion Arm of the Milky Way.

Electromagnetic waves are not mechanical and transverse in nature, while

Sound waves are mechanical and longitudinal

Explanation:

In physics, waves are classified into two types:

Moreover, depending on the direction of the vibration, waves are further classified into:

Electromagnetic waves are not mechanical and transverse in nature (the oscillations of the electric and magnetic fields occur in a plane perpendicular to the direction of the wave), while

Sound waves are mechanical and longitudinal (the vibrations of the particles of the medium is back-and-forth along the direction of propagation of the wave)

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Answer:

20784.6m

Explanation:

Check attachment

I hope this was helpful, Please mark as brainliest

Answer:

it false, APEX, i just did this one

Explanation:

Answer:

False

Explanation:

The law of conservation of energy states that energy can neither be created nor destroyed - only converted from one form of energy to another.

Answer:

It is due to the effect of temperature on our taste receptors.

Explanation:

a) The work done by the gravitational force on the flat surface is zero

b) The work done by the gravitational force on the ramp is -634 J

c) The work done by the applied force on the flat surface is 500 J

d) The work done by the applied force on up along the ramp is 500 J

Explanation:

a)

The work done by a force is given by the equation

[tex]W=Fdcos \theta[/tex]

where

F is the magnitude of the force

d is the dispalcement of the object

[tex]\theta[/tex] is the angle between the direction of the force and of the displacement

In this problem, we want to calculate the work done by the gravitational force as the box is pushed across the flat ground.

We immediately notice that the gravitational force acts downward, while the displacement is horizontal: therefore, the angle between force and displacement is [tex]90^{\circ}[/tex]; this means that [tex]cos 90^{\circ}=0[/tex], and therefore, the work done is zero:

[tex]W=0[/tex]

b)

In this case, the box is pushed along the ramp. We have:

[tex]F=mg=(50.0)(9.8)=490 N[/tex] is the magnitude of the force of gravity, where

m = 50.0 kg is the mass of the box

[tex]g=9.8 m/s^2[/tex] is the acceleration of gravity

d = 5.00 m is the displacement of the box along the ramp

The ramp is inclined to the horizontal by [tex]15.0^{\circ}[/tex], therefore the angle between the force of gravity and the displacement of the box (moving up along the ramp) is:

[tex]\theta=90^{\circ}+15^{\circ}=105^{\circ}[/tex]

Therefore, the work done by gravity in this case is:

[tex]W=(490)(5.00)(cos 105^{\circ})=-634 J[/tex]

c)

In this case, we want to calculate the work done by the force you apply as the box is pushed across the flat ground.

Here we have:

F = 100.0 N (force applied)

d = 5.00 m (displacement of the box)

[tex]\theta=0^{\circ}[/tex] (the force is applied parallel to the flat surface, therefore force and displacement have same direction)

Therefore, the work done by the force you apply on the flat ground is:

[tex]W=(100.0)(5.00)(cos 0^{\circ})=500 J[/tex]

d)

In this last case, we want to calculate the work done by the force you apply as the box is pushed up along the ramp.

This time we have:

F = 100.0 N (force applied is the same)

d = 5.00 m (displacement of the box is also the same)

[tex]\theta=0^{\circ}[/tex] (the force is applied parallel to the ramp, therefore force and displacement have again same direction)

Therefore, the work done by the force you apply while pushing the box along the ramp is:

[tex]W=(100.0)(5.00)(cos 0^{\circ})=500 J[/tex]

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Final answer:

The centripetal force on the sensor is 2544.06 N.

Explanation:

To calculate the centripetal force of on the sensor attached at the end of the wind turbine blade, we can use the formula:

F = m * r * ω²

Where F is the centripetal force, m is the mass of the sensor, r is the radius of the wind turbine blade, and ω is the angular velocity.

Substituting the given values, we have: F = 4.5 kg * 90.0 m * (2π rad/s).

After calculating, we get the centripetal force on the sensor to be 2544.06 N.

Answer:

2m/s

Explanation:

Speed= distance / time

?         =  60m      / 30s

speed= 60/30

60/30=2

speed= 2m/s