What law of motion is this a runner who reaches the finish line must continue running for some time???

Answer:

YOUR ANSWER IS HERE....

The 7.5V d.c.power supply is made from five 1.5V cells by placing the cells in series combination.

Direct current (DC) voltage is provided by a DC power supply, sometimes referred to as a bench power supply, to power a device. An AC, DC, battery, or ultralow voltage input can be used to power a DC power supply control subsystem.

Potential difference of each cell = 1.5 V.

When they are placed in series combination, the potential difference from the dc power supply be = 5 × 1.5 V = 7.5 V.

Hence, the cells should be placed in series combination.

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Answer:

Explanation:

from 2nd equation of motion

S=vi t +1/2 a(t)²

vi=2 s-at /t

vi=2*200 m- 9.8*10 /10

vi=302/10

vi=30.2 m/s

H= vi*t+1/2 a t^2

H=30.2*10+1/2 9.8*10

H=302+1/2*9.8*10

H=302+1/2(98)

H=302+98/2

H=506/2

H=253

Molecular Orbital Theory (MOT) is a key concept in understanding chemical bonding, and it explains the formation of bonds through the interaction of atomic orbitals. The essential feature of MOT responsible for bond formation is the concept of constructive and destructive interference between the overlapping atomic orbitals.

When two atoms approach each other, their atomic orbitals overlap and combine to form molecular orbitals. These molecular orbitals can be bonding or antibonding, depending on the nature of their interaction. Constructive interference occurs when the wave functions of the atomic orbitals combine in-phase, resulting in a lower energy molecular orbital with electron density concentrated between the nuclei. This increased electron density strengthens the electrostatic attraction between the positively charged nuclei and the negatively charged electrons, forming a stable chemical bond.

On the other hand, destructive interference occurs when the wave functions of the atomic orbitals combine out-of-phase, leading to the formation of a higher energy antibonding molecular orbital. In this case, electron density is reduced between the nuclei, creating a node that weakens the electrostatic attraction and destabilizes the bond. Electrons in antibonding orbitals can counteract the bonding effect of electrons in bonding orbitals.

Bond order, a measure of bond strength, is determined by the difference between the number of electrons in bonding and antibonding orbitals. A positive bond order signifies a stable bond, while a zero or negative bond order indicates that the bond is not formed or is weak.

In summary, the formation of molecular orbitals through constructive and destructive interference between atomic orbitals is the key feature of MOT responsible for bond formation. Bonding orbitals result in stable chemical bonds, while antibonding orbitals can weaken or prevent bonds from forming.

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Answer:

1) current

2) energy

3) medium

4) matter

Explanation:

A wave is a medium that carries energy through space. Some waves travel through empty space. Other waves must travel through a material, also known as an energy. Waves transfer energy but not matter.

A wave is a phenomenon that flows across a material medium without leaving any lasting mark. Mechanical or electromagnetic waves can be used to classify it. Transverse and longitudinal are the two main forms.

A disturbance that travels through a medium with a transfer of matter and without a transfer of energy best describes a wave.

The primary distinction between transverse and longitudinal waves is that in transverse waves, wave particles travel perpendicular to the wave's direction, but in longitudinal waves, wave particles move horizontally.

A wave is a medium that carries energy through space. Some waves travel through empty space. Other waves must travel through a material, also known as an energy. Waves transfer energy but not matter.

Hence, the correct answer for the blanks are medium,energy,and matter.

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Normally, materials are electrically neutral because there are equal numbers of positively charged particles and negatively charged particles, hence option D is correct.

Since there are exactly as many electrons in an atom as there are protons, the positive and negative charges "balance out," leaving atoms electrically neutral.

Neutrons are found in the nuclei of all atoms, with the exception of the majority of hydrogen atoms. Neutrons are electrically neutral, as opposed to electrically charged protons and electrons.

Therefore, due to having an equal number of positively charged particles and negatively charged particles materials are electrically neutral.

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Answer:

i dont know

Explanation:

sorry

Answer: C water

Explanation: The explanati is not hard cause the main elements of earth is fire ice water earth

Answer:

A. Gold (Au)

Explanation:

When an atom of magnesium loses two electrons, it forms a magnesium ion with a charge of +2.

Here's an explanation why:

An atom of magnesium (Mg) has 12 electrons in its neutral state and two electrons in its outermost shell. When it reacts with an electron acceptor and loses two electrons, the two valence electrons in the 3s subshell are lost, resulting in a stable electronic configuration of neon.

The resulting magnesium ion now has a 2+ charge and is represented as Mg2+.

Magnesium is a common alkaline earth metal that has 12 protons and 12 electrons in its neutral state. Magnesium has an atomic number of 12 and an atomic weight of 24.305 grams per mole. Magnesium is a silvery-white metal that is light in weight and has a melting point of 1,202 degrees Fahrenheit (650 degrees Celsius).

Mg2+ is a common ion in biological systems, and magnesium is the second most abundant cation in the human body after potassium. Magnesium's main function in the human body is to help with the maintenance of proper muscle and nerve function, as well as to help regulate the body's metabolic activities.

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The buoyant force on a 1-kilogram helium-filled balloon will be considerably more than the buoyant force of the atmosphere on a 1-kilogram iron block.

The buoyant force is the force exerted by a fluid, such as air or water, on an object that is submerged in it. It is equal to the weight of the fluid displaced by the object.

In this case, we are comparing the buoyant force of the atmosphere on a 1-kilogram iron block to the buoyant force on a nearby 1-kilogram helium-filled balloon.

Helium is a gas that is much less dense than air, which means that it will displace a larger volume of air than the iron block of the same mass.

Therefore, the buoyant force on the helium-filled balloon will be considerably more than the buoyant force on the iron block. This is because the buoyant force is directly proportional to the volume of fluid displaced by the object.

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Answer: this answer is definitely c for k12

Explanation:

a) It takes you 1.893s to reach the opened door and jump in.

b) The maximum time that you can wait before starting to run and still catch the bus is 1.27s

The time which the passenger can delay and still catch the bus must be less than this.

From the question:

Distance between the passenger and the door of the bus d = 9

Acceleration of the bus a¹ = 1.0m/s²

Speed of the passenger v = 5.7m/s

Time taken for you to catch up with the bus must occur at the exact position with the bus,

Let the position = y

The time taken for you to reach the point:

t = total speed/distance

t = y + 9/5.7 ..................... eqn 1

The time taken for the bus to reach the same point;

y = vt + 1/2at²

Initial velocity of the bus is zero

y = 0.5*(1)t²

y = t²/2

t = √2y .......................eqn 2

We solve eqn (1) and (2) together:

9 + y = 5.7 * √2y

81 + y² + 18y = 64.98y

y² - 46.98y + 81 = 0

y = 45.187m or 1.792m

Now we take the smallest distance: x=1.792 m

Time taken for both to reach this point: (put x in eq. (1))

t = 1.792+9/5.7

t = 1.893s

For the maximum waiting time we find have:

Relative acceleration, ar = -1m/s⁻²since the bus is moving away from the intended

The final relative velocity for the passenger to catch it, vr = 0m/s⁻¹

Using equation of motion:

s = 9 + 1/2 * (-1)t²

also the initial relative velocity:

vr = ur + ar.t

ur = 5.7 - t

and

vr² = ur² + 2ar.s

0² = (5.7 - 1)² - 2 * 1 * (9 - 0.5t²)

t = 1.27s

Here's the complete question:

You are 9.0 m from the door of your bus, behind the bus, when it pulls away with an acceleration of 1.0 m/s2. You instantly start running toward the still-open door at 5.7 m/s.

How long does it take for you to reach the open door and jump in?

What is the maximum time you can wait before starting to run and still catch the bus?

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Answer:

Tension, Ft = 79.91 N

Explanation:

The tension in the string is the resultant force that exists in the string due to the centripetal effect of the swinging ball.

From conservation laws, the tension in the string will be equals to the centripetal force acting on the string.

The tension in a string can be obtained using the formula:

\(T=mv^2/R\)

where v = linear velocity of the metal ball which equals to the angular velocity of the ball X the radius of the ball.

The radius of the ball is given as 72 cm = 0.72m and the angular velocity = 1.02 rad/second.

Therefore, linear velocity, \(v = 2\pi \times 1.02\times 0.72 =4.616m/s\)

The tension in the string will now be equals to \(2.7 \times 4.616^2 /0.72 =79.91N\)

The errors that can be eliminated by balancing the distance of backsight and foresight in leveling are. An error caused by the tilt of a leveling stick., Reading error. option A

Balancing the distance of backsight and foresight in leveling is crucial to minimizing the errors that occur in leveling. The errors that can be eliminated by balancing the distance of backsight and foresight in leveling are D. An error caused by the tilt of a leveling stick .It is impossible to eliminate curvature of the earth and the effect of atmospheric refraction as they are natural phenomenon. These errors can be minimized by taking several backsight and foresight distances at different intervals. The objective of this method is to lessen the effect of refraction and ensure that the distance is not too far. It is also necessary to avoid tilting the leveling stick as much as possible.To get an accurate level measurement, you must balance the backsight and foresight distances. If the backsight distance is too far, the bubble may not be centered due to a decrease in sensitivity, which will result in an incorrect measurement. Similarly, if the foresight distance is too far, there will be a decrease in sensitivity, which will result in an incorrect measurement.

In conclusion, it is essential to maintain a proper distance between the backsight and foresight distances in leveling to eliminate errors that can occur. The errors that can be minimized are D. An error caused by the tilt of a leveling stick.

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The speed of wave with a wavelength of 4 m and a frequency of 85 Hz is 340m/s

The speed of a wave is the product of the frequency of the wave and its wavelength. Mathematically, it is expressed as:

\(v = f \lambda\) where:

f is the frequency

\(\lambda\) is the wavelength

Given the following:

f =85Hz

\(\lambda\) = 4 m

Substitute the given parameter into the formula:

v = 85 × 4

v = 340m/s

Hence the speed of wave with a wavelength of 4 m and a frequency of 85 Hz is 340m/s

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Answer:

d

Explanation:

because ik igvddhh56yfdsaw66 u77rfgtd gyy f music nutren

Answer:

D. A difference in resistance

steamAnswer: (d) particles of steam at a hundred degrees CelsiusThe highest kinetic energy will be in particles of steam at a hundred degrees Celsius.

Answer:   Burning of wood is a chemical change while cutting of wood is a physical change because during burning, new substances are formed. After burning, we cannot get original substance, (i.e. wood) back. Cutting of wood into small pieces is a physical change because no new substance is formed.

Answer:

1000 seconds

Explanation:

1km is equivalent to 1000meters

15km to 15000meters

Time=Distance/Speed

15000meter/15 meter per second =1000 seconds

Energy and matter are both conserved within natural processes. It follows that while energy and matter can adopt different forms, they cannot be produced or extinguished. Different types of matter and energy can combine, and energy and matter frequently cycle within a system.

Explain energy.

Energy is the ability to perform tasks. It could appear in numerous different forms, such as potential, kinetic, thermal, electrical, chemical, nuclear, etc. Additionally, there is heat and work, which is energy being transferred from one entity to another.

The most important source of chemical energy for sustaining life is found in food. The three states of matter—liquid, solid, and gas—are essential because matter and energy move in concert along food networks.

An ice cube composed of water, for instance, changes into liquid water when you add energy, and when you add even more energy, it turns into steam. The type of matter and the quantity of matter are the same as in the original cube, but the level of energy may be higher or lower.

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The virtual image of the object appears to be located at the focal point.

When an object is located at a very large distance from a diverging mirror, the light rays coming from the object will be nearly parallel.

These parallel light rays will be incident on the diverging mirror at different angles, and the mirror will cause them to reflect away from each other, thus creating the illusion that the rays are diverging from a point. This point is called the virtual focus, or the focal point, of the mirror.

The focal length of a diverging mirror is defined as the distance between the mirror and its focal point. Since the image formed by a diverging mirror is always virtual, meaning it cannot be projected onto a screen, the image location is also measured from the mirror.

Thus, when an object is very far away, the image formed by a diverging mirror will always be located at a distance equal to the focal length of the mirror from the mirror itself, on the same side as the object.

This phenomenon can be explained using the ray diagram of a diverging mirror. A ray diagram is a diagram that shows the path of light rays as they pass through an optical system, such as a mirror.

In the case of a diverging mirror, the ray diagram shows that light rays coming from the object are reflected away from the mirror as if they were diverging from the focal point.

Therefore, the virtual image of the object appears to be located at the focal point.

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With less ice, it could greatly affect the animals that depend on the ice, such as polar bears, walruses, and many other animals. This could result in their species eventually going extinct.

When the switch is turned on the lightbulb flashes on once, and then no current passes through it, the correct option is E.

When the switch is turned on, the circuit on the left will experience a brief period of changing current as the current ramps up to its final value. This changing current produces a changing magnetic field, which in turn induces an emf in the inner solenoid.

This induced emf causes a brief current to flow in the outer solenoid, which is connected to the lightbulb circuit. As a result, the lightbulb will flash on momentarily. However, once the current in the left circuit reaches its final value, the magnetic flux through the inner solenoid will stop changing, and thus the induced emf in the outer solenoid will drop to zero, the correct option is E.

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The complete question is:

Consider the two concentric solenoids shown in Figure, one of which is attached to a battery, a resistor, and a switch and the other of which is attached to a lightbulb. (No current passes directly between the two circuits.) When the switch is turned on, what is expected to happen?

A. No current passes through the lightbulb.

B. The intensity of the lightbulb increases and quickly reaches its maximum, final intensity.

C. The lightbulb flickers on and off with a regular frequency and constant intensity.

D. The lightbulb flickers on and off with a regular frequency and decreasing intensity.

E. The lightbulb flashes on once, and then no current passes through it.

The quarks that compose a baryon may have charges of +(2/3)e and -(1/3)e which means have negative and positive charges.

Quarks are the most fundamental particles that make up the atomic nucleus. All solid matter that we know is made of three particles, which are the up and down quarks, 'u' and 'd', and the electron.

Quark is one of the two basic elements that make up matter and is the only one of the particles that interacts through all four fundamental forces.

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Answer:

d

Explanation:

I really don't know how to explain

Wavelength of the electron is 6.28 x 10^(-11) m. The energy of the electron is 3.51 electron volts in energy.

(b) The wavefunction can be represented as ψ(x) = A cos(kx - ωt) where k is the wavenumber.

The wavelength of the electron is given by

λ = 2π/k

Therefore, λ = 2π/(10^10)

Therefore, λ = 6.28 x 10^(-11) m

(ii) The momentum of the electron can be calculated using the de Broglie relation:

p = hk, where h is Planck's constant and k is the wavenumber of the electron.

Therefore, p = h/λ

Therefore, p = 6.626 x 10^(-34)/(6.28 x 10^(-11))

Therefore, p = 1.05 x 10^(-23) kg m/s

(iii) The energy of the electron is given byE = (p^2)/(2m)

where m is the mass of the electron

Therefore, E = (1/2)(9.11 x 10^(-31))(1.05 x 10^(-23))^2

Therefore, E = 5.62 x 10^(-10) Joules

To convert Joules to electron volts, divide by 1.6 x 10^(-19)

Therefore, E = 3.51 eV

Therefore, the energy of the electron is 3.51 electron volts in energy.

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The tension in the rope is equal to the weight of the box when lowering it at a constant speed.

When you lower a box attached to a rope straight down at a constant speed, the tension in the rope must equal the weight of the box. This is due to the equilibrium of forces acting on the box.

The weight of the box, which is the force exerted by gravity, pulls the box downward. To counteract this downward force and maintain a constant speed, the tension in the rope must match the weight of the box.

In this scenario, the tension in the rope is the force that is transmitted from your hand to the box through the rope. When the box is at a constant speed, it means that the net force acting on the box is zero.

The tension in the rope must balance out the weight of the box to achieve this equilibrium. If the tension is less than the weight of the box, the box would accelerate downward. Conversely, if the tension is greater than the weight, the box would accelerate upward.

By adjusting the tension in the rope to match the weight of the box, you can lower it at a constant speed without any acceleration. This principle is important to ensure stability and control when manipulating objects using ropes or cables.

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Answer:

c

Explanation:

The texture of the string. I took this test a week ago I got a 90% it is c!

The temperature of the ice/water mixture will not change because the energy is going into melting the ice. The correct answer is option C.

In a home ice cream freezer, the flavored cream is surrounded by a mixture of ice and water. As the ice cream freezes, it releases energy in the form of heat, which is absorbed by the ice/water mixture. This energy transfer is used to melt the ice, while the temperature of the ice/water mixture remains constant at the freezing point (0°C or 32°F).

This is due to the phase change from solid to liquid, which requires energy without causing a temperature change. The stirring process helps in even distribution of coldness and prevents the formation of large ice crystals, but it does not affect the temperature of the ice/water mixture.

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