How much work is done by 15 kW engine during 3.0 min?

The chemical energy of petrol is converted to heat energy on combustion. The heat energy is converted to kinetic energy by the use of internal combustion engines in vehicles. The law of conservation of energy is maintained in each process.

The kinetic energy of an object is associated with its motion. It can be related to the mass and velocity as

K.E = 1/2 mv²

Given is a diagram of energy conversion due to combustion.

The chemical energy of petrol is converted to heat energy on combustion. The heat energy is converted to kinetic energy by the use of internal combustion engines in vehicles.

The law of conservation of energy states that the energy can neither be created nor destroyed. It can be only converted to one form to the other.

In the given process, the mass decreases but energy remains the same in all forms of energy.

Hence, the law of conservation of energy is maintained in each process

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Answer:A

Explanation:

The wavelength of the sound wave will be 3 meters.

The wavelength of any wave is defined as the distance between two max adjacent amplitudes, or the distance between two successive troughs or crest.

Now it is given that:

Distance =9 meters

time = 3 seconds

pitch=1/3 seconds

The velocity of  the sound will be

\(V=\dfrac{d}{t}=\dfrac{9}{3}=3\ \frac{m}{s}\)

Now from the question the wavelength of the sound wave if the velocity of the wave remains constant but the pitch is tripled

so  \(f=3\times \dfrac{1}{3}=1 herts\)

Now the velocity of the sound will be

\(v=f\times \lambda\)

\(\lambda=\dfrac{v}{f}=\dfrac{3}{1}=3\ m\)

Thus the wavelength of the sound wave will be 3 meters.

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Gọi là máy quang phổ kế

That's a diffraction grating.

According to the question of force, the y-component of F3 is -2.719 N.

What is force?

Force is a fundamental concept in physics that describes the interaction between two objects or systems. It is a vector quantity, meaning it has both magnitude and direction, and can be described mathematically. Force is a push or pull that can cause an object to accelerate, change its direction, or change its shape. Force is a function of mass and acceleration, as described by Newton's second law of motion.

The y-component of F3 can be calculated using the equation F3y = F1y + F2y. Since F1 is at a 180° angle, its y-component is 0. The y-component of F2 can be calculated using the equation F2y = F2 × sin(θ), where θ is the angle of F2. In this case, θ is 2430°, so the y-component of F2 is 8.90 × sin(2430°) = 8.90 × -0.3105 = -2.719 N. Therefore, the y-component of F3 is -2.719 N.

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False. The heat capacity of a substance is the amount of heat required to raise the temperature of a given amount of that substance by 1 degree Celsius.

In this case, the video experiment showed that the heat capacity of aluminum is greater than that of water. If we replace the aluminum with a mystery metal and the water heats up to 40∘C while the mystery metal heats up to 80∘C, it means that the mystery metal absorbed more heat than water. However, the question states that the mass of the mystery metal is the same as that of water. Therefore, if the mystery metal absorbed more heat than water, it must have had a higher heat capacity, not one-third as great. Therefore, the statement that the heat capacity of our mystery metal is one-third as great as that of water is false.

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Answer:

a law stating that electric current is proportional to voltage and inversely proportional to resistance.

Answer: they vibrate faster and becomes hotter

Explanation:

.

Quantization of electron energy states in an atom is a fundamental concept in atomic physics and quantum mechanics. It refers to the discrete and distinct energy levels that an electron can occupy in an atom.

This quantization is better understood in terms of the electron's wave-like nature. The electron behaves like a wave, and its energy is related to the wavelength and frequency of the wave.
The wave-like behavior of the electron was first proposed by Louis de Broglie in 1924, and it was later confirmed by experiments. According to de Broglie's theory, electrons have wave-particle duality, meaning that they can exhibit both wave-like and particle-like behavior. When an electron is confined to an atom, its wave-like behavior leads to the quantization of energy levels.
The quantization of energy levels in an atom arises from the fact that electrons can only occupy specific orbitals around the nucleus. These orbitals have specific energies associated with them, and the electron can only exist in one of these energy levels. When an electron absorbs or emits energy, it must do so in discrete packets or quanta, which correspond to the energy difference between the energy levels.
In summary, the quantization of electron energy states in an atom is a consequence of the wave-like nature of the electron. It arises from the fact that electrons can only occupy specific orbitals around the nucleus, and their energies are quantized in these orbitals. This concept is fundamental to our understanding of atomic structure and has important implications for a wide range of fields, including chemistry, materials science, and electronics.

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Answer:

Planets, moons, asteroids and sun

Answer:

The average speed is 5.8 m/s

Explanation:

I just did it

Explanation:

HERE,

momentum =126 kg.m/s

weight =12 kg

we know that,

\(\tt{ velocity =\dfrac{momentum }{weight} }\)

According to the question,

Deers velocity

=\(\tt{\dfrac{126}{12} }\) ⠀

=\(\tt{ 10.5 }\) ⠀

Deers velocity is 10.5 m/s.

Answer: 17 hours

Explanation:

The force the magnetic field exerts on the particle is 0.072 N with velocity

Charge q = 8 μC is moving with a velocity v = [31 +43] x 106 m/s. If the charge enters a magnetic field B=0.4k T, then the magnitude of the magnetic force (in N) on the charge is given by

F = q x v x B

Given thatq = 8 μC

                   = 8 x 10-6 C

Velocity v = [31 +43] x 106 m/s

                = [31,000,000 + 43,000,000] m/s

                = [74,000,000] m/s

Magnetic field B = 0.4k T

                           = 0.4 x 103 T

TeslaSubstituting these values in the above equation, we get

F = (8 x 10-6) x (74 x 106) x (0.4 x 103)

F = 2.95 N

Therefore, the magnitude of the magnetic force (in N) on the charge is 2.95 N.

Another problem:

Given that a particle with a charge of 5.0 C travels at 2.0 m/s and encounters a magnetic field of 0.0100 T that makes an angle of 46.0 with respect to the x-axis in the xy-plane. We need to find the force the magnetic field exerts on the particle.

The force F on the particle is given by:

F = q x v x B x sin(θ)Where q is the charge of the particle, v is the velocity of the particle, B is the magnetic field and θ is the angle between the velocity of the particle and the magnetic field.

F = 5.0 C x 2.0 m/s x 0.0100 T x sin(46.0)

F = 0.072 N

Therefore, the force the magnetic field exerts on the particle is 0.072 N.

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Answer:

Velocity is the rate at which an object changes position

Answer:

A) ( - 200t + 40 ) volts

B)  b) anticlockwise ,  c) anticlockwise , d) clockwise ,  e) clockwise

Explanation:

Given data:

magnetic flux (Φm) = 5.0t^2 − 2.0t

number of turns = 20

a) determine induced emf

E = - N \(\frac{d\beta }{dt}\)

  =  - N ( 10t - 2 ) = - 20 ( 10t - 2 )

  =  - 200t + 40  volts

b) Determine direction of induced current

i) at t = 0

 E = - 0 + 40  ( anticlockwise direction )

ii) at t = 0.10

E = -20 + 40 =  20 ( anticlockwise direction )

iii) at t = 1

E = - 200 + 40 = - 160 ( clockwise direction)

iv) at t = 2

E = -400 + 40 =  - 360 ( clockwise direction )

An example of a way to conserve energy in a home is "Replacing old windows with new ones." The correct option is D.

Conserving energy in a home involves reducing energy consumption and improving energy efficiency. Replacing old windows with new ones is an example of improving energy efficiency.

Old windows can be a significant source of energy loss due to poor insulation and air leaks. By replacing them with new, energy-efficient windows that provide better insulation and minimize air leakage, energy consumption can be reduced, making it an effective way to conserve energy in a home.

A. Removing weather-stripping around doorways: Weather-stripping around doorways helps prevent air leaks, which improves energy efficiency by reducing heating or cooling loss. Removing weather-stripping would result in increased energy consumption, making it an incorrect choice.

B. Using old light bulbs: Old light bulbs, such as incandescent bulbs, are less energy-efficient compared to newer, energy-saving options like LED bulbs. Using old light bulbs would result in higher energy consumption, making it an incorrect choice.

C. Reducing the use of insulation: Insulation is an essential component for energy efficiency in homes. It helps to reduce heat transfer and maintain a stable indoor temperature. Reducing the use of insulation would result in increased energy loss and higher energy consumption, making it an incorrect choice.

Therefore, the correct option is D. Replacing old windows with new ones because it improves energy efficiency and helps conserve energy in a home.

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The net force acting on the toy is 2N in the right direction.

Given,

F1= 8N

F2= 6N

Fnet = F1-F2

        = 8-6

Fnet = 2N

The direction of the force will be in the right direction.

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Answer:

Kejlshkdhh4hrbrldbd

Answer:

A to jump

Explanation:

hope this helpes!

Answer:

1. 5 m/s

2. 5 m/s/s

Explanation:

1. 50 - 5 = 45

45/9 = 5

2. 25 - 0 = 25

25/5 = 5

hope this helps!

Answer:

The use of the flame in the model depicting the separation of the mixture is justified as it allows the water to evaporate and be collected in its pure form, leaving the salt component behind. This is known as distillation.

Explanation:

Option B is the correct answer as it accurately describes the process of distillation. Distillation involves heating the mixture of salt water until it boils and evaporates, leaving behind the salt. The water vapor is then cooled and condensed back into liquid form, resulting in pure water. The flame is used to heat the mixture and allow the water to evaporate. The salt, being a solid, remains behind and can be separated from the pure water. Therefore, the use of the flame in the model is necessary to carry out the process of distillation, which is an effective way to separate salt water into its components in order to obtain pure drinking water.

The baton's angular momentum about the point where the axis of rotation contacts the baton's center is 7.68 x 10(-2) kg/m(2)/s.

The sum of the moment of inertia and the angular velocity is known as the angular momentum of a rigid object. If there isn't any external torque acting on the item, it behaves similarly to linear momentum and is subject to the basic restrictions of the conservation of angular momentum principle.

The fact that angular momentum is rigorously preserved in our universe—that is, that it can be transferred but not created or destroyed—makes this a significant physical quantity.

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Answer:

B

Explanation:

Just got it right

Answer:

The person above is right, it is B

Explanation:

got it right

At time t = 15/16, the object reaches a state of zero velocity, indicating a momentary pause in its motion. Prior to this time, the object moves in one direction, while after this time, it changes direction and moves in the opposite direction. The value t = 15/16 represents the specific moment when the object transitions from one direction to another and experiences a brief period of rest.

To find the velocity v(t) of the object at any time t, we differentiate the given distance function s(t) = 9 - 15t + 8t² with respect to time:

v(t) = d/dt (9 - 15t + 8t²)

Applying the power rule of differentiation, we obtain:

v(t) = -15 + 16t

Therefore, the velocity v(t) of the object at any time t is given by v(t) = -15 + 16t.

To determine when the object is at rest, we set the velocity v(t) equal to zero and solve for t:

-15 + 16t = 0

Adding 15 to both sides of the equation, we have:

16t = 15

Finally, dividing both sides by 16, we find

t = 15/16

Hence, the object is at rest when t = 15/16.

This means that at time t = 15/16, the object's velocity is zero, indicating that it is momentarily stationary. Before this time, the object is moving in one direction, and after this time, it is moving in the opposite direction. The value t = 15/16 represents the specific point in time when the direction of motion changes, and the object is at rest for an instant.

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Answer:

Explanation:

The definition of acceleration is the change in velocity over a period of time. If the girl's velocity is constant, that means it's not changing. Therefore, acceleration is 0 m/s/s