The internal kinetic energy of molecules produces ...?

Answer:

B. Greater energy

Explanation:

Fast moving water is very energetic as its can displace very large rocks, boulders and make pebbles and sand out of them through the process r erosion. Fast moving water have kinetic energy, it opposes anything that come in its way. As river make its own channel by eroding plane. Many antecedent rivers have make their channel by cutting large mountains too.

The find the final speed of the 2.0-kilogram body is 65 m/s towards east.

To find the final speed of a 2.0-kilogram body initially traveling at 40 meters per second east, we will use the following physics concepts:

Newton's Second Law of Motion: F = ma, where F is the force, m is the mass, and a is the acceleration.

Kinematic Equation: vf = vi + at, where vf is the final velocity, vi is the initial velocity, a is the acceleration, and t is the time.

Step 1: Calculate the acceleration.

Using F = ma, we can solve for a:

F = 10 N

m = 2.0 kg

So, a = F/m = 10 N / 2.0 kg = 5 m/s²

Step 2: Calculate the final velocity using the kinematic equation.

Initial velocity, v_i = 40 m/s

Acceleration, a = 5 m/s²

Time, t = 5 s

So, vf = vi + at

[tex]v_f = 40 \, \text{m/s} + (5 \, \text{m/s}^2 \times 5 \, \text{s}) = 40 \, \text{m/s} + 25 \, \text{m/s} = 65 \, \text{m/s}[/tex]

Therefore, the final speed of the body is 65 meters per second east.

speed

i took the test just know and put velocity and it was wrong. it said the answer was speed

Given distance and a period, we can calculate speed, angular velocity, frequency, and even time dilation effects. Speed is calculated using the formula v = d/t.

If you are given distance and a period, you can calculate several interesting physics concepts. One fundamental calculation would be speed or velocity since speed equals distance divided by time (v = d/t). If the movement occurs at a constant speed, this is straightforward. However, suppose the speed varies or involves a pendulum or circular motion. In that case, you can dive into more specific calculations such as angular velocity, frequency, and time dilation effects in relativity for movements approaching the speed of light.

For example, the period T of an object moving back and forth with a constant speed v over a distance 2L, such as a pendulum, can be calculated using T = 2L/v. Similarly, the frequency, f, of such an oscillating system is found using f = 1/T. These concepts apply to various systems, including satellites orbiting a planet where the period is related to the orbital distance from the center of the celestial body.

The runner's acceleration is -2 m/s², indicating deceleration at a rate of 2 meters per second squared over a period of 2 seconds.

The acceleration of a runner who goes from 6 m/s to 2 m/s in 2 seconds can be calculated using the formula for acceleration which is Δv/Δt, where Δv is the change in velocity and Δt is the change in time. In this case, Δv = final velocity - initial velocity = 2 m/s - 6 m/s = -4 m/s (the negative sign indicates deceleration). The time interval Δt is 2 seconds. Thus, acceleration a is calculated as:

a = Δv/Δt = (-4 m/s)/2 s = -2 m/s².

This indicates that the runner is decelerating at a rate of 2 meters per second squared.

Answer:

B, h=9

Explanation:

Final answer:

Option E) Sea Water is a poor electrical insulator among the given options, which include Plastic, Glass, Wood, and Sea Water, because the free ions in sea water enable it to conduct electricity well.

Explanation:

The question asks which of the given options is a poor electrical insulator. A poor electrical insulator would be a good conductor of electricity. Out of the options provided (Plastic, Glass, Wood, and Sea Water), option E) Sea Water is a poor insulator because it contains a high concentration of free ions, making it a good conductor of electricity. This is in stark contrast to materials like plastic, glass, and wood, which are known to be good insulators because they do not allow charges to move through them easily.

Materials like Styrofoam, fiberglass, and goose-down feathers are also mentioned as examples of good insulators, as they contain small pockets of air which is a poor conductor of heat. However, for electrical insulation, air's thermal properties are less relevant than its ability to prevent electric charge movement. When discussing electrical insulators, it's important to note that the presence of free ions, as found in Sea Water, can lead to better conductivity of electricity, making it a poor electrical insulator.

Explanation:

Physical change is a change in which there is no change in chemical composition of the substance.

For example, when we freeze liquid water then it changes into solid, that is, only physical state of water has changed and no change in chemical composition.

Therefore, in a physical change there is change only in the arrangement, energy and movement of particles.

Answer:

In a galaxy, the expansion of the universe actually does not have any effect, because the force of gravity is enough to kinda keep the celestial bodies in their orbits.

Now, the expansion can be seen between galaxies (according to the Hubble's law, the far away is the galaxy, the faster it seems to move away), so the forces between stars actually will not really change, and the forces that the stars are experiencing by bodies in other galaxies are almost depreciable, so nothing will happen.

To calculate the total atmospheric force on the top of a table, the table's surface area is multiplied by the atmospheric pressure (F = PxA). The total force upward on the underside of the table under normal circumstances is equal to the downward atmospheric force.

The subject of this question is physics focusing specifically on the concept of air pressure and force. To determine the total force of the atmosphere acting on the table, we first need to know that the atmospheric pressure is about 101325 N/m2. The force F is calculated by multiplying the pressure P with the area A (F = P x A). Hence, the area of the table is 1.5 m x 2.2 m = 3.3 m2. Therefore, the total force is F = 101325 N/m2 x 3.3 m2 = 334472.5 N, which is the answer to part (a).

For part (b) of the question, under normal circumstances, the total force acting upward on the underside of the table is the same as the downward atmospheric force, that is, 334472.5 N. This equal upward force is what keeps objects from being crushed by the atmospheric pressure.

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Newton's first law of motion states that an object remains at rest unless a(n) external force acts on it.

Newton's first law can be defined as if an object is at rest it remains at rest, or if in motion, remains in motion which has a constant velocity unless acted on by a net external force.

The equation for Newton’s first law is as follows:

F = dp /dt

or

F = d(mv)/dt

In this statement, p is the momentum. As p=mv, the second equation replaces p with mv. V is the object’s velocity, t is the time, and F is for force.

Newton's first law can also be called as the law of inertia because inertia refers to the amount of resistance of an object can be related to a velocity change. Here, Velocity change can be described in terms of the speed of the object or its direction.

When we known with the different part of inertia is the tendency to continue which moves in the same direction line at a constant speed when no forces act on them. Thus, it can be described as an object remains at rest unless an external force acts on it.

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Final answer:

Newton's first law of motion, or the law of inertia, indicates that an object at rest stays at rest and an object in motion maintains its velocity unless acted on by a net external force.

Explanation:

Newton's first law of motion, also known as the law of inertia, states that an object remains at rest or if in motion, continues to move at a constant velocity unless acted upon by a net external force. This principle explains why an object will not change its state of motion unless a force is applied to it. For example, a soccer ball on the ground will not move until a player kicks it, applying a net external force to overcome its inertia.

The cheetah will run a distance of 360 meters in 12 seconds if it maintains a constant speed of 30 m/s.

To determine how far a cheetah will run in 12 seconds at a speed of 30 m/s, we use the formula for distance traveled at a constant speed, which is [tex]distance = speed \times time[/tex]. Here, the speed is 30 m/s, and the time is 12 seconds, so the distance the cheetah runs is:

[tex]Distance = 30\ m/s \times 12\ s = 360\ meters.[/tex]

Therefore, the cheetah will run a distance of 360 meters in 12 seconds if it maintains a constant speed of 30 m/s throughout that time.

The Gay-Lussac law can clarify this, which states that if the temperature rises in the summer, the pressure should rise as well in order for K to remain constant.

Gay-law Lussac's is most commonly associated with Joseph-Louis Gay-law Lussac's of combining volumes of gases, which was discovered in 1808 and published in 1809.

It can also refer to the proportionality of a gas's volume to its absolute temperature at constant pressure.

The law is named after the French chemist who discovered the relationship between a gas's pressure and absolute temperature. Joseph gay lussac was his name.

The Gay-Lussac law, which states that if the temperature rises in the summer, the pressure must rise as well in order for K to remain constant, can help to clarify this.

Thus, the Gay-Lussac law can explain her observation.

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Answer:

New force, F' = 2.33 N

Explanation:

It is given that,

A physicist found that a force of 0.72 N was measured between two charged sphere.

The distance between the spheres was, d = 0.9 m

We have to find the force between the two sphere when the distance was decreased to d' = 0.5 m

The force acting between two charged particles is given by :

[tex]F=k\dfrac{q_1q_2}{r^2}[/tex]

i.e. F is inversely proportional to the square of distance between the charges. Let F' is the force when distance is decreased.

So, [tex]\dfrac{F}{F'}=(\dfrac{d'}{d})^2[/tex]

[tex]\dfrac{0.72}{F'}=(\dfrac{0.5}{0.9})^2[/tex]

On solving, we get : F' = 2.33 N

Hence, on decreasing distance the force between the charges increases.

The normal force exerted by the table on a 4kg book, when a hamster pushes down on the book with an additional force of 3N, is 42.2N.

When a 4kg book sits on a table, it is subject to Earth's gravity which pulls it down. This force, due to gravity, is given by the mass of the book multiplied by the acceleration due to gravity (Fg = mass × gravity), which is 4 kg × 9.8 m/s² = 39.2 N.

This downward force is balanced by an upward normal force (N) exerted by the table.

When a hamster pushes down on the book with an additional force of 3 N, the total downward force becomes Fg + 3 N.

Since the book is stationary on the table, the combined downwards forces must be balanced by the normal force exerted by the table.

Therefore, the normal force is equal to the weight of the book plus the force exerted by the hamster. So, N = 39.2 N + 3 N = 42.2 N. This is the normal force exerted by the table on the book.

The normal force exerted by the table on a 4kg book, which a hamster is pushing down on with a force of 3N, is 42.2 N, as it must balance the combined weight of the book and the force applied by the hamster.

Calculating the Normal Force

When considering the scenario of a 4kg book resting on a table with a hamster pushing down on it, we must take into account the forces acting on the book. The weight of the book due to gravity is given by W = mg, where m is the mass of the book and g is the acceleration due to gravity (9.80 m/[tex]s^2[/tex]).

Therefore, the weight of the book is W = 4 kg imes 9.80 m/[tex]s^2[/tex] = 39.2 N. The hamster exerts a downward force of 3 N, which adds to the weight of the book. The total downward force on the book is thus 39.2 N + 3 N = 42.2 N.

According to Newton's third law, the normal force exerted by the table on the book must balance this total downward force in the absence of vertical acceleration. Therefore, the normal force that the table exerts on the book is also 42.2 N.

Answer:

Gravity is the force of attraction between two objects; it is dependent upon the mass of the objects and the distance between the objects.

Explanation:

Gravity is defined as the force of attraction between two objects. It depends on the masses of objects and the distance between them. The gravitational force between two bodies is given by the universal law of gravitation. According to this law, the force of gravity is :

[tex]F=G\dfrac{m_1m_2}{d^2}[/tex]

Where

G is the universal gravitational constant

m₁ and m₂ are masses of two bodies

d is the distance between two bodies

Hence, the correct statement that describes gravity is (b)

Answer:

The answer is Gravity is the force of attraction between two objects; it is dependent upon the mass of the objects and the distance between the objects.

Explanation:

Gravity is a natural phenomenon by which objects with mass are attracted to each other, mostly observable in the interaction between planets, galaxies and other objects in the universe. It is one of the four fundamental interactions that causes the acceleration experienced by a physical body in the vicinity of an astronomical object. It is also called gravitational interaction or gravitation.

Answer:

52.2%

Explanation:

Efficiency= output temperature/ input temperature

output temperature= input temperature-exhaust temperature

so, 653 K - 312 K = 341 K

341 K / 653 K = 52.2%

I got the answer correct on the online quiz.

Answer:

sea floor spreading

Explanation:

I got it right on studyisland

The term that best describes the geologic event taking place in the above illustration is seafloor spreading. The correct option is D.

The magma forces itself upward more dramatically when the seafloor spreads slowly. As a result, mountain ranges and cliffs become taller and more dramatic. The process by which crustal plates—large cubes of Lithospheric plates from one another is known as seafloor spreading.

As the tectonic plates move away from one another, they pull the seafloor with them, causing fractures and cracks to form. During this time, hot magma would bubble up and quickly fill in the cracks, causing the seafloor to move. This is demonstrable because magnetism on the ocean floor indicates that it formed in this manner.

Therefore, the correct option is D. seafloor spreading.

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The question is incomplete. Your most probably complete question is given below: The image is added.

Answer:

Answer D: It describes the relationship between motion and force.

Explanation:

The answer is D because a law is something that describes something in nature, but does not try to explain how or why is occurs (that is a theory). Options B and C sound more like theories, while option A sounds like a definition. Option D is correct because a law describes without explaining.

Final answer:

The correct statement about Newton's first law of motion is that it describes the relationship between motion and force. While related, the second law quantitatively establishes the cause and effect between force and changes in motion.

Explanation:

When examining Newton's laws of motion, it is important to understand the specific insights they provide about force and motion. Newton's first law of motion, often called the law of inertia, states that an object at rest will stay at rest, and an object in motion will remain in motion with the same speed and in the same direction unless acted upon by an unbalanced force. Given the options, the most accurate statement about Newton's first law of motion is:

D. It describes the relationship between motion and force.

Newton's second law of motion complements the first by providing a mathematical expression of the relationship between force, mass, and acceleration. This law is crucial because it quantifies the cause and effect of forces on objects and allows us to make predictions about how an object will move when a force is applied.

Answer:

The answer is False

Explanation:

Pressure is understood as a force exerted by a gas, a liquid or a solid on a surface. An increase in pressure tends to favor volume contraction. For example, the lower the pressure exerted on the surface of a liquid, the easier it is to vaporize, because the molecules of the liquid find less resistance to leave it and transform into steam.

The system gains energy and the sign of w is positive if work is done on it. According to the principle of energy conservation, every change in the system's energy must take into account both the energy it has received and lost. Thus, option B is correct.

An interaction with its environment causes a system's internal energy to decrease. The internal energy of a system grows when work is done on it.

The energy change from work always takes place as part of a process, much like the energy change from heat: a system can perform work, but it doesn't contain work.

Therefore, when the system makes an impact on the environment, we characterize work as being positive (energy leaves the system). The work is negative if it is done to the system (energy added to the system).

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Answer: A 0.5kg

Explanation:

Momentum is defined as the product of mass and velocity of a body.

Momentum = mass × velocity

Mass = ?

Momentum = 7.5kgm/s

Velocity = 15m/s

Mass = Momentum/Velocity

Mass = 7.5/15

Mass = 0.5kg

The elastic constant of the wire is about 470 N/m

[tex]\texttt{ }[/tex]

Let's recall Elastic Constant formula as follows:

[tex]\boxed{k = \frac{E A}{L}}[/tex]

where:

k = elastic constant ( N/m )

E = Young's Modulus ( Pa )

A = cross-sectional area ( m² )

L = initial length ( m )

Let us now tackle the problem!

[tex]\texttt{ }[/tex]

Translation:

A wire, with cross sectional area A = 5 mm² and length L = 32 cm, is stretched by a force. Assuming that Young's modulus of wire E = 3 × 10⁷ N/m², calculate the elastic constant k of the wire !

Given:

cross sectional area = A = 5 mm² = 5 × 10⁻⁶ m²

length of wire = L = 32 cm = 0.32 m

Young's modulus of wire = E = 3 × 10⁷ N/m²

Asked:

elastic constant of wire = k = ?

Solution:

[tex]k = \frac{E A}{L}[/tex]

[tex]k = \frac{ (3 \times 10^7) \times (5 \times 10^{-6})}{0.32}[/tex]

[tex]k = 468.75 \texttt{ N/m}[/tex]

[tex]k \approx 470 \texttt{ N/m}[/tex]

[tex]\texttt{ }[/tex]

[tex]\texttt{ }[/tex]

Grade: High School

Subject: Physics

Chapter: Elasticity

Carrie is making a presentation on solar winds. Her notes of the steps that must occur for solar winds to form are given then the correct sequence in the formation of solar winds would be 3 ⇒2⇒4⇒1.

The energy transferred from the Sun in the form of electromagnetic radiation is known as the solar energy

It can be used as thermal energy for various life purposes as well as for electricity conversion with the help of solar photovoltaic cells,

As given in the problem Carrie is making a presentation on solar winds. Her notes of the steps that must occur for solar winds to form are below

1. The stream of electrically charged particles collides with gas atoms, causing the latter to give off light.

2. The electrically charged particles flow outward in all directions as far as Saturn.

3. The stream of electrically charged particles flows outward from the corona.

4. The particles of the solar wind flow along lines of the magnetic field.

Thus, the correct sequence in the formation of solar winds would be 3 ⇒2⇒4⇒1.

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The bending of wave crests as they reach shallow water is called refraction, occurring alongside shoaling, which results in increased wave heights. Refraction is caused by the variation in wave speed due to different water depths. When waves become too tall relative to their wavelength, they break, often curling forward.

The bending of wave crests as they reach shallow water is known as refraction. This phenomenon occurs because different segments of the wave crest experience changes in wave speed due to the varying depths of water they encounter. The sections of a wave crest in deeper water travel faster compared to those in shallower water, causing the wave to bend and tend to align more parallel to the shoreline. As waves reach shallow water, there is also an increase in wave height due to the shoaling effect, where the energy of the wave is compressed into a smaller volume of water. The process of waves becoming more asymmetric and experiencing changes in their crest and trough structure is a result of both shoaling and refraction.

Moreover, when a wave 'touches bottom' in shallow water, the friction causes the wave to slow down and the wavelength to decrease while the wave height increases. When the wave height becomes too high relative to the wavelength, the wave becomes unstable and forms a breaker. The top part of the wave moves faster than the bottom, due to less friction encountered by the seafloor, often resulting in a forward curling motion as the wave breaks.