An object is moving with a constant velocity of 278 m/s. How long will it take it to travel 7500 m, using the formula Delta X=Vt+1/2at^2

If you're going really really slow and you hit the brakes, you're going to stop almost instantly. When you're going faster, you've got your energy which is your body size so it takes energy to stop the bike. When you slam the brake you're trying to apply that energy to the wheels. Even if you lock them up so the wheels aren't spinning, you skid because friction is rubbing against the ground and that will be what eventually stops you.

If you have a wider tire, you're going to have more surface area hitting the ground and that will cause more friction so you will stop faster. If you have skinnier tires you will skid more so there are a bunch of different factors.

Answer: Mass and acceleration

Explanation: I took the test

Final answer:

The correct answer is that if we decrease the voltage without changing the resistance, the current will decrease. So, the correct option is B.

Explanation:

The statement that correctly describes the relationship between current, voltage, and resistance is: If we decrease the voltage, and do not change the resistance, the current will also decrease. This is in accordance with Ohm's Law which states that current (I) is equal to the voltage (V) divided by the resistance (R), or I = V/R. Therefore, if the voltage is decreased and resistance remains constant, the current will decrease as well.

Regarding the parallel circuit question, if two identical resistors are connected in parallel and the resistance of one is increased, the current through the unaffected resistor remains the same because the voltage across it hasn't changed. However, the total current in the circuit will decrease because the overall resistance has increased.

To increase the power dissipated in a circuit with constant current, one should reduce the resistance. Power (P) can be calculated using the formula P = I2R, where I is current and R is resistance. Reducing resistance increases power dissipation.

The awser is c)Pressure will compress a gas, reducing its volume and giving it a greater density and concentration of particles.

During free fall, the ball's gravitational potential energy transforms into kinetic energy. As the ball falls and speeds up, its kinetic energy increases while its gravitational potential energy decreases, due to the conservation of mechanical energy.

During free fall, the kinetic energy and gravitational potential energy of the ball undergo transformations. Initially, when the ball is at its highest point, it has maximal gravitational potential energy and minimal kinetic energy (assuming it starts from rest). As the ball falls, its height decreases, resulting in a decrease in gravitational potential energy. Simultaneously, the ball speeds up, indicating an increase in kinetic energy.

This process involves the conversion of gravitational potential energy into kinetic energy, denoted as AKE = -APEg. Essentially, the loss in potential energy equals the gain in kinetic energy, which is a result of the conservation of mechanical energy principle. The details of this transformation hold true as long as there is no friction or air resistance acting on the ball.

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As the ball falls, gravitational potential energy is converted into kinetic energy, causing it to speed up. At the moment before it hits the ground, the potential energy is zero, and the kinetic energy is maximum. Upon impact, kinetic energy transforms into other energy forms, and during the bounce, if any, some energy converts back to potential energy.

As a ball falls during free fall, its gravitational potential energy is converted into kinetic energy. Initially, the ball has maximum potential energy and zero kinetic energy when starting from rest. As it descends, the potential energy decreases while the kinetic energy increases, causing the ball to speed up. Just before impact, the potential energy reaches zero, and the kinetic energy is at its maximum.

During the collision with the ground, the kinetic energy is momentarily converted into other forms of energy, such as elastic energy and thermal energy. If the ball bounces back, some of this energy converts back into kinetic energy, which will then transform into potential energy as the ball rises again.

Zero acceleration means that the object's velocity is constant, not that it is zero. An object in motion could have zero acceleration if it's moving at a consistent speed in a straight line. An object at rest would have both zero acceleration and zero velocity.

Even if an object has zero acceleration, that does not necessarily mean it has zero velocity. In Physics, velocity is the speed of an object in a particular direction, and acceleration is the rate at which its velocity changes. If an object's acceleration is zero, that means the object's velocity is not increasing or decreasing—it's constant. For example, an object moving at a consistent speed of 10 m/s in a straight line would have zero acceleration. However, its velocity is not zero because it is still moving. On the other hand, an object at rest would also have zero acceleration and zero velocity. Therefore, zero acceleration indicates constant velocity but the velocity could be any value, including zero.

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Developmental Psychology is the correct answer. It is a branch of psychology that studies the changes in human behaviors and mental activities from infancy to old age.

Among the options provided, D. Developmental Psychology is the discipline concerned with the scientific study of changes in human behaviors and mental activities over time. This field of psychology explores the progression of human development from infancy to old age, covering cognitive, emotional, social, and physical aspects. It seeks to understand how humans evolve and adapt at different stages of life, thereby providing a comprehensive view of human growth.

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Answer:

Correlations allow you to determine causes.

Explanation:

I just had this on my lesson and used the other answer and I got it wrong so I just wanted to make it correct!! (FYI i saw the right answer on my lesson after I got it wrong)

Answer:

The relative speed of the boat is found to be - 2 m/s or 2 m/s in opposite direction to the river current.

Explanation:

Let us, consider the direction of river as the reference of positive direction. Hence,

Speed of River = Vr = 8 m/s

Since, the boat is traveling upstream. The upstream direction means that the boat is traveling in the opposite direction of the river current. Therefore, its direction will be negative. Hence,

Speed of boat = Vb = - 10 m/s

Now, the relative speed will be the vector sum of both speeds, with relative directions:

Relative Speed = V = Vr + Vb

V = 8 m/s - 10 m/s

V = - 2 m/s

This shows that the magnitude of speed of boat is 2 m/s and its direction will be opposite to that of river current.

To find the boat's speed relative to the riverbank, subtract the river current's speed from the boat's speed. The resulting speed is 2.0 m/s upstream relative to the riverbank.

Calculating the Boat's Speed Relative to the Riverbank

To determine the boat’s speed relative to the riverbank, we need to consider both its own speed and the speed of the river current.

When traveling upstream, the boat’s speed relative to the riverbank can be found by subtracting the speed of the river current from the boat’s speed:

[tex]\text{Relative speed = Speed of the boat - Speed of the river current}[/tex]

Therefore,

[tex]\text{Relative speed} = 10.0 m/s - 8.0 m/s = 2.0 m/s.[/tex]

Thus, the boat is moving at 2.0 m/s relative to the riverbank when it is traveling upstream.

The law of conservation of electric charge asserts that in an isolated system, the total electric charge remains constant. Electric charge cannot be created or destroyed; it can only be transferred between particles, underpinning fundamental principles in electromagnetism and physics.

The conservation of electric charge is a fundamental principle in physics known as the law of conservation of charge. This principle states that the total electric charge in an isolated system remains constant over time. In other words, electric charge cannot be created or destroyed; it can only be transferred or redistributed within the system.

This law is rooted in the fundamental properties of matter and the nature of electric interactions. At the atomic and subatomic level, matter is composed of positively charged protons, negatively charged electrons, and neutrally charged neutrons. Any change in the distribution of electric charge within a system must involve a transfer of electrons between atoms or particles. When electrons are transferred from one object to another, one becomes more negatively charged, and the other becomes more positively charged, ensuring that the total charge remains conserved.

The conservation of electric charge is essential for understanding various electrical phenomena and is a foundational principle in electromagnetism. It plays a crucial role in circuit theory, electrostatics, and electromagnetic interactions, providing a framework for understanding and predicting the behavior of electric charges in a wide range of physical processes and systems.

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The probable question may be:

During any process, the net electric charge of an isolated system does not change. Explain.

The final displacement of the delivery truck from the origin is calculated using vector components and the Pythagorean theorem. After traveling north, east, and south, the magnitude of the displacement is approximately 17.7 blocks.

The question is asking for the final displacement of a delivery truck after it travels a certain distance in a city grid, which involves vector addition to determine. To calculate the displacement, we consider the truck's movements along the north-south axis and the east-west axis separately. The truck travels 21 blocks north, then 26 blocks south which results in a net movement of 5 blocks south (since 26 - 21 = 5). Along the east-west axis, it travels 17 blocks east with no westward movement. Now, we can use the Pythagorean theorem to find the magnitude of the displacement since the movements along north-south and east-west are perpendicular to each other.

Displacement magnitude = √(southward movement2 + eastward movement2) = √(52 + 172) = √(25 + 289) = √(314) ≈ 17.7 blocks

Therefore, the magnitude of the displacement of the truck from the origin is approximately 17.7 blocks.

Vector is a quantity that has a magnitude and direction.

A vector in a cartesian coordinate is represented by an arrow in which the slope of the arrow shows the direction of the vector and the length of the arrow shows the magnitude of the vector.

A position vector of a point is a vector drawn from the base point of the coordinates O (0,0) to that point.

The addition of two vectors can be done in the following ways:

[tex]\overrightarrow {AB} + \overrightarrow {BC} = \overrightarrow {AC}[/tex]

A negative vector is a vector with the same magnitude but in opposite direction.

[tex]\overrightarrow {AB} = -\overrightarrow {BA}[/tex]

Let's tackle the problem!

Two vectors are equal if they have the same magnitude and direction. In the attached picture, it can be clearly seen that the vector AB has the same magnitude and direction with vector DC. Therefore, vector AB is equal to vector DC.

Grade: High School

Subject: Physics

Chapter: Vectors

Keywords: Velocity , Driver , Car , Deceleration , Acceleration , Obstacle , Speed , Time , Rate , Vector , Scalar

The vector r⃗ AB denotes the vector from point A to point B. It is calculated by subtracting the coordinates of point A from the coordinates of point B. To determine which of the presented vectors corresponds to r⃗ AB, knowledge of the coordinates of points A and B is required.

The vector r⃗ AB represents the vector from point A to point B. In order to identify which of the given vectors is equal to r⃗ AB, you would need to know the coordinates of points A and B. The vector r⃗ AB is computed by subtracting the coordinates of point A from the coordinates of point B (i.e., B - A). For example, if point A has coordinates (x1, y1) and point B has coordinates (x2, y2), then the vector r⃗ AB would be (x2-x1, y2-y1).

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The electromagnetic spectrum contains both visible and invisible part of the spectrum like UV, X, Gamma, IR and so on.

Electromagnetic spectrum, the complete dispersion of electromagnetic radiation by frequency or wavelength Even though all magnetic waves move at the speed as in a vacuum, do so at a variety of frequencies, durations, and particle energies.

The range of all electromagnetic waves is represented by the electromagnetic spectrum, which also includes numerous subranges, or sections, such as visible light, and ultraviolet radiation.

Light will come in a variety of "colors" that really are invisible to the human sight, including radio, infra, ultraviolet, X-ray, & gamma rays. The visual system can only detect visible light. Infrared light, which is on the side of the spectrum but is too red for people to see, is all over us and is even released by our bodies.

The region of electromagnetic radiation that the human eye can see is known as the visible light spectrum. This group of wavelengths is more commonly referred to as visible light. The range of wavelengths that the visual system can typically see is from 380 to 720 nm.

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Final answer:

The electromagnetic spectrum includes all types of electromagnetic radiation, from gamma rays to radio waves. Visible light, which humans can see, is a narrow portion ranging from 380 to 740 nm. Different species perceive different parts of the spectrum.

Explanation:

Electromagnetic Spectrum Overview

The electromagnetic spectrum consists of all types of electromagnetic radiation, which vary in their frequencies and wavelengths. The spectrum includes both visible and invisible light, with visible light being the small portion that can be perceived by the human eye. Electromagnetic radiation encompasses a wide range of types, including gamma rays, X-rays, ultraviolet (UV) light, visible light, infrared (IR) radiation, microwaves, and radio waves. The visible spectrum specifically is comprised of light in the wavelengths from approximately 380 to 740 nanometers (nm), displaying a rainbow of colors where violet and blue are at the shorter wavelength (higher energy) end, and red is at the longer wavelength (lower energy) end.

Other species can detect different parts of the spectrum; for example, honeybees can see UV light, and some snakes sense infrared radiation. Moreover, the spectrum is detailed by its frequency and wavelength, with visible light occupying a very narrow band, predominated by colors when separated by a prism.

Each part of the electromagnetic spectrum has unique properties and uses in various applications, such as medical imaging (X-rays), telecommunications (microwaves and radio waves), and in studying celestial bodies and phenomena (gamma rays).

Newton's Third Law of Motion and his Law of Universal Gravitation are connected through the action-reaction pair concept, where the gravitational force between two objects satisfies both laws, allowing the explanation of planetary motion.

Newton's Third Law of Motion states that for every action, there is an equal and opposite reaction. This principle can be seen in the way forces operate between two bodies due to gravity. Newton's Universal Law of Gravitation provides the mathematical expression for gravitational attraction stating that every particle in the universe attracts every other particle along a line between their centers of mass. The force of attraction is directly proportional to the product of their masses and inversely proportional to the square of the distance between them.

When you apply Newton's Second Law of Motion, which relates force to mass and acceleration (F=ma), to the force defined by the Law of Universal Gravitation, you get a clear description of how bodies move under the influence of gravity. This also helps to understand Kepler's laws of planetary motion in a more profound way. The connection is evident when considering the gravitational force between two objects, such as the Earth and the Moon, which acts as an action-reaction pair. This action-reaction pair satisfies both the Universal Law of Gravitation and Newton's Third Law, allowing Newton to elucidate the motion of the planets, which was one of the most important physics problems of his time.

Heat is transferred from the pan to the water through conduction, convection current is present in both the pot and the water, the egg receives heat from the water through radiation.

Through moving a heated fluid, like air or water, convection is the method by which heat is transferred.

Most fluids have a tendency to expand when heated, which causes them to become less dense and rise due to the increased buoyancy. This effect's circulation is responsible for the even heating of the air in a heated room or the water in a kettle: heated molecules expand the space they move in by moving faster against one another, rise, and then cool and get closer to one another once more, increasing density and causing a consequent sinking.

In case of conduction direct contact is required, but in case of radiation it is not necessary.

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Answer:

Part a)

Distance = 28.5 cm

Part b)

Displacement = 15.5 cm

Explanation:

Part a)

Total distance moved by the ball is given as total path length

so here we can say

distance moved in positive direction = 22 cm

distance moved in negative direction = 6.5 cm

total path length = 22 + 6.5 = 28.5 cm

Part b)

Displacement is the shortest distance between initial and final position

so we need to add vectorially

so here we have

displacement in positive direction = 22 cm

displacement in negative direction = 6.5 cm

Total displacement = 22 - 6.5 = 15.5 cm

Answer:10.3

Explanation:

Answer:

The gravitational potential energy of the can dropped from a shelf that is 1.5 m high, is 10.29 J. Rounding the answer to the nearest tenth of a joule, we have that the potential energy is 10.3 J.

Explanation:

The potential gravitational energy can be written as

[tex]V=mgh[/tex]

where m is the mass of the object, g is the gravitational acceleration, and h is the altitude of the object.

One thing we must understand is that V is a relative quantity, so we need to establish an altitude where V=0, in this case, the zero potential could be at the floor, so the altitude where the can is beeing dropped is h=1.5m.

Doing this, we have that

[tex]V=(0.7kg)*(9.8\frac{m}{s^2})*(1.5m)=10.29J[/tex]

and when rounded, we have the final answer:

[tex]V=10.3J[/tex]