Electricity produced in a generating plant passes through a large step-up transformer. This step-up transformer produces the high voltages needed to send electric power long distances across the countryside. Which of the following is transferred from the transformer's primary coil to its secondary coil while the transformer is operating?

A) Negative electric charges and power

B) Positive electric charges, negative electric charges, and power

C) Power alone

D) Positive electric charges and power

Answer:   1.195479Hz

I think

A photon is a quantum of light is the correct answer.

A photon is tiny packets of energy of electromagnetic radiation. This concept is presented by Albert Einstein in order to explain the photoelectric effect. Photon is also known as light quantum because it is related to light.

So we can conclude that photon is a quantum of light is the correct answer.

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Answer:

a quantum of light

Explanation:

I got it right on the test.

Answer:

Saltaions :)

Explanation:

TELL ME IF I AM WRONG

The acceleration of the elevator at this time was 2m/s² and the elevator was accelerating the upward direction.

The mass of the child standing on a spring scale in an elevator is 30 kg the elevator is showing a reading of 360 Newtons.

The reading note by the elevator is given by radiation,

W = M(g+a)

Where w is the reading of the spring scale,

M is the mass of the child,

g is the gravitational acceleration which is given to be 10m/s² and a is the acceleration of the elevator.

Putting values,

360 = 30(10+a)

12 = 10+a

a = 2m/s²

As you can see from the above result that the acceleration of the lift is 2m/s² and because it is positive it means that the elevator is accelerating in the upward direction.

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Option B, the fact that the rubber band is made up of elastic material ensures that it possesses mechanical energy as mechanical energy is stored in the form of kinetic and potential energy.

Mechanical energy is one form of energy in which the total energy is conserved in the form of kinetic and potential energy. In mechanical energy kinetic energy changes into potential energy and vice-versa.

Elastic materials are types of materials that get back to their original shape after getting stretched by an external force. For example, rubber is an elastic material because it is stretched when force is applied to it but returns to its original shape once the forces are removed.

Now in the given question we have been asked why rubber band has mechanical energy.

The first option states because of mass but since  the meaning of mass does not insure that it is only mechanical energy it could also be electrostatic energy or any other form of energy.

Option B talks about the elastic nature of rubber band which is a correct answer to the question.

Elastic nature of the rubber band ensures that the total energy remains conserved in the form of mechanical energy.

In rubber band when it is stretched in the stressed position it stores energy in the form of potential energy.

While it is released from stretched position the energy gets converted into kinetic energy therefore conserving the total mechanical energy.

Therefore option B which states that the mechanical energy of the rubber band exist because of elastic nature of the material of the rubber band is the correct option.

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The 4.0 kg cat must stand 1.9 meters to the left of the pivot to balance the seesaw. To keep the seesaw balanced, the torques on both sides of the pivot must be equal.

Torque is defined as force multiplied by distance from the pivot.  The weight of the 5.1 kg cat and 2.5 kg bowl of tuna fish will exert a torque on the right side of the pivot, while the weight of the 4.0 kg cat on the left side will exert a torque on the left side of the pivot.

Let x be the distance the 4.0 kg cat stands from the pivot. Then, the torque on the right side is (5.1+2.5)kg * 4.0m = 30.4 Nm. To balance this, the torque on the left side must also be 30.4 Nm.

Therefore,

(4.0kg * x)m = 30.4Nm, and

x = 7.6m/4.0kg = 1.9m.

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The equation of kinematics, which states that velocity is equal to the change in distance divided by the change in time, may be used to determine the water balloon's velocity as it strikes the ground.

In this instance, the change in time equals the amount of time it takes for the water balloon to descend from the window to the ground, and the change in distance is 27 m. The time it takes for the water balloon to descend from the window to the ground, under the assumption that there is no air resistance, is equal to the amount of time it takes for an object to fall from rest, as determined by the equation t = (2h/g).

The window's height is given in this equation by h (27 m), and g is the gravitational acceleration (9.8 m/s2). Consequently, t = ( 2*27/9.8) = 2.4 s is the length of time it takes for the water balloon to descend from the window to the ground. As a result, the water balloon's impact velocity is calculated as 27 m/2.4 s = 11.25 m/s, where s is the change in time and m is the change in distance. This velocity should be measured in m/s.

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The additional force needed to bring the car into equilibrium is equal to the mass of the car times the acceleration of the car, or F = ma.

Equilibrium is a state of balance and stability between opposing forces or actions. In economics, it refers to the point where the supply and demand for a given product or service are equal, and the market price of the product or service is stable. In physics and chemistry, equilibrium is a state in which different competing forces are balanced, so that no net change is observed. In biology, it is the ability of an organism to maintain a stable internal environment despite changes in external conditions. Ultimately, equilibrium is a state of balance, stability, and homeostasis.

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Answer:

The answer is

Explanation:

The velocity or speed of an object can be found by using the formula

\(velocity \: = \frac{distance}{time} \)

From the question

time taken to travel = 10 hours

distance covered = 550 miles

Substitute the values into the above formula and solve for the velocity

That's

\(velocity = \frac{550}{10} \)

We have the final answer as

Hope this helps you

Answer:

d. are easily compressible.

Explanation:

Solids and liquids are not easily compressible while gas is.

B. The amount of work done by the worker on the wheelbarrow is 250 J.

The amount of work done by the worker on the wheelbarrow is calculated as follows;

W = Fd

where;

W = 50 x 5

W = 250 J

Thus, the amount of work done by the worker on the wheelbarrow is 250 J.

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Two waves have the same amplitude but they can have different frequencies. The wave with a higher frequency will have greater energy. Therefore, the given statement is correct.

The frequency of electromagnetic waves or any wave can be described as the number of oscillations in one second. The frequency can be represented as per second or hertz.

The wavelength of the wave can be defined as the distance between two crests or troughs on a wave that is separated by a distance known as wavelength. The wavelength of the waves is expressed in meters.

The relationship between frequency (ν) and energy of the wave:

E = hν

The frequency of the waves has a direct relation with the energy of the waves. Therefore, the wave which has a higher frequency will carry greater energy whether they have the same amplitude.

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Answer:

False

Explanation:

.......................

Explanation:

F = 40 N

d = 3 m

Work

W = Fd

where: W - work, J

F - force, N

d - distance, m

W = Fd

W = (40 N)(3 m)

W = 120 Nm or 120 J

From the calculation and the momentum of the body, the velocity is 62 m/s

The term momentum refers to the product of mass and velocity. Now recall that the rate of change of momentum is equal to the impressed force.

Hence;

7440 kg-m/s = 120 kg * v

v= 7440 kg-m/s/120 kg

v =  62 m/s

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Answer:

0.25m/s

Explanation:

D = 450m

T = 1800s

S = 450÷1800

= 0.25m/s

The average speed will be equal to 0.25 meters per second.

Speed is defined as the ratio of the time distance travelled by the body to the time taken by the body to cover the distance. Speed is the ratio of the distance travelled by time. The unit of speed in miles per hour.

Given that 200 meters to school and another 250 meters to your friend's

house. This whole trip took 30 minutes.

The total distance is D = 450m

T = 1800s

The average speed will be calculated as

S = Total distance / Total time

S = 450÷1800

S = 0.25m/s

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The speed of the 1.2 kg block after the spring is released is 3 m/s to the left.

According to the question, a 1.2 kg block and a 1.8 kg block are initially at rest on a frictionless, horizontal surface. When a compressed spring between the blocks is released, the 1.8 kg block moves to the right at 2.0 m/s as shown. We need to determine the speed of the 1.2 kg block after the spring is released.The system's initial momentum is zero since the blocks are at rest. The system's final momentum is made up of the 1.2 kg and 1.8 kg blocks' respective momenta. As a result, the conservation of momentum equation becomes:m1i * v1i + m2i * v2i = m1f * v1f + m2f * v2fWhere m1i * v1i is the 1.2 kg block's initial momentum, m2i * v2i is the 1.8 kg block's initial momentum, m1f * v1f is the 1.2 kg block's final momentum, and m2f * v2f is the 1.8 kg block's final momentum.

As the 1.8 kg block moves to the right at 2.0 m/s after the spring is released, its momentum is:m2i * v2i = 1.8 kg * 0 m/s = 0 kg * m/sm2f * v2f = 1.8 kg * 2 m/s = 3.6 kg * m/sTo calculate the final momentum of the 1.2 kg block, we must first determine its final velocity. We can rearrange the conservation of momentum equation above to solve for v1f:m1f * v1f = m1i * v1i + m2i * v2i - m2f * v2fv1f = (m1i * v1i + m2i * v2i - m2f * v2f) / m1fPlugging in the values:v1f = (1.2 kg * 0 m/s + 1.8 kg * 0 m/s - 1.8 kg * 2 m/s) / 1.2 kgv1f = -3 m/s. Therefore, the speed of the 1.2 kg block after the spring is released is 3 m/s to the left.

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Answer:

A simple machine having a velocity ratio of 3 simply means that the ratio of the distance moved by effort to the distance moved by load is equal to 3.

Explanation:

A simple machine can be defined as a type of machine with no moving parts but can be used to perform work.

Basically, a simple machine allows for the transformation of energy into work. The six simple machines are;

I. Inclined plane.

II. Screw.

III. Wheel and axle.

IV. Lever.

V. Wedge.

VI. Pulley.

Mathematically, the velocity ratio of a simple machine is given by the formula;

\( Velocity \; ratio = \frac {Distance \; moved \; by \; effort}{Distance \; moved \; by \; load} \)

Hence, a simple machine having a velocity ratio of 3 simply means that the ratio of the distance moved by effort to the distance moved by load is equal to 3.

Answer:

a) Eg = 3,060.72 j

b) Ek = 2,080 j

c) Etotal = 5,140.72 j

d) Eg = 5,140.2 j

Ek = 0 j

Etotal = 5,140.2 j

Explanation:

The given parameters of the person riding the skateboard are;

The mass of the person, m = 65 kg

The height of the person (above ground level), h = 4.8 m

The speed at which the person is traveling, v = 8.0 m/s

a) The gravitational potential energy, Eg = m·g·h

Where;

m = The mass of the object at the given height = 65 kg

g = The acceleration due to gravity, g ≈ 9.81 m/s²

h = The height by which the object is elevated = 4.8 m

∴ Eg = 65 kg × 9.81 m/s² × 4.8 m = 3,060.72 joules

The gravitational potential energy, Eg = 3,060.72 J

b) The kinetic energy, Ek, is given as follows;

Ek = 1/2·m·v²

Where;

v = The velocity of the object = 8.0 m/s

∴ Ek = 1/2 × 65 kg × (8.0 m/s)² = 2,080 joules

The kinetic energy, Ek = 2,080 J

c) The total mechanical energy, Etotal = Eg + Ek

∴  Etotal = 3,060.72 j + 2,080 j = 5,140.72 J

The kinetic energy, Ek = 5,140.72 J

d) If the ramp had a total height of 8.0 m, we have;

At the 8.0 m height

Etotal = Eg(max), Ek = 0 j

With the given values, we get;

Eg(max) = 65 kg × 9.81 m/s² × 8 m = 5,101.2 joules = Etotal

Eg(max) = 5,101.2 j

Etotal = 5,101.2 j

Ek = 0 j

However, using only the values in the question with the assumption that all things being equal, we have;

Etotal = Constant = 5,140.72 j

Eg a the max height, 8.0 m = Eg(max) = Etotal = 5,140.2 j

Ek = 0 j

Answer:

Smallest - B

Largest - C

Middle - A

The hanging mass provides the force for accelerating the system.

In case A the force M G accelerates 2 * M

So you have for F = M a     M * g = 2 * M * a    or  a = g / 2

In case B  F = M a         M * g = 3 * M * a        and a = g / 3

In case C   F = 2 * M * g      2 M * g = 3 * M * a      and a = 2 * g / 3      

Rank from smallest to largest force Smallest - B, Middle - A, Largest - C.

A force is an effect that can alter an object's motion according to physics. An object with mass can change its velocity, or accelerate, as a result of a force. An obvious way to describe force is as a push or a pull. A force is a vector quantity since it has both magnitude and direction.

Smallest - B

Largest - C

Middle - A

The hanging mass provides the force for accelerating the system.

In case A the force M G accelerates 2 * M

So you have for F = M a     M * g = 2 * M * a    or  a = g / 2

In case B  F = M a         M * g = 3 * M * a        and a = g / 3

In case C   F = 2 * M * g      2 M * g = 3 * M * a      and a = 2 * g / 3  

Rank from smallest to largest force Smallest - B, Middle - A, Largest - C.

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Answer:

When an object falls, its gravitational potential energy is changed to kinetic energy. ... Gravitational potential energy for a mass m at height h near the surface of the Earth is mgh more than the potential energy would be at height 0. (It's up to you where you choose height 0.)

Explanation:

Answer:

Qwertyujiknb vcdxrftyhbvcdxrft6y7uij

Explanation:

At time t = 0, the plane of the coil is parallel to the magnetic field of magnitude B = 1.05 T. The coil has 75 turns and a diameter of 8.5 cm. It rotates at an angular velocity of ω = 9.5 rad/s.

The maximum induced emf (electromotive force) in the coil can be calculated using the formula ε = NABω, where N is the number of turns, A is the area of the coil, B is the magnetic field, and ω is the angular velocity. Substituting the given values, we have ε = (75)(π(0.0425)²)(1.05)(9.5) ≈ 0.348 V.

In an AC generator, a coil rotating in a magnetic field generates an alternating current (AC). The induced emf in the coil depends on factors such as the number of turns, the area of the coil, the magnetic field strength, and the angular velocity.

To calculate the maximum induced emf, we use the formula ε = NABω, where ε is the emf, N is the number of turns, A is the area of the coil, B is the magnetic field, and ω is the angular velocity.

In this case, the coil has 75 turns, and its diameter is given as 8.5 cm. We use the diameter to calculate the radius (r) of the coil, which is half the diameter (8.5/2 = 4.25 cm = 0.0425 m). The area of the coil is then A = πr².

Substituting the given values, we have ε = (75)(π(0.0425)²)(1.05)(9.5). Evaluating this expression gives us the maximum induced emf in the coil, approximately equal to 0.348 V.

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Answer:

Unlike hard disks, which use magnetic charges to represent 1s and 0s, Compact Disks, DVD's or Blue Rays use reflected light.

Explanation:

The way CD's work is that they are hit by a laser beam which is reflected on the surface of the disc. These disks have some valleys and mountains that reflect light differently so the CD player will interpret these differences in reflection as data which will then be turned into music, videos or computer files.

Answer:

A.

Explanation:

Never swim alone just in case something happens

Answer:

the answer is partner

Explanation:

this is common sense. if you are drowning or need help your partner will either be able to help you, or get help this is why u should NEVER swim alone no matter where or who you are. May i be marked brainliest?

Answer:

where are the statements ??

Answer:

The card stays in place because of the air pressure inside the glass and the weight of the water. When the glass is filled with water and the card is placed on top, there is no air between the water and the card. When the glass is inverted, the weight of the water creates a vacuum, and the air pressure inside the glass decreases. This decrease in air pressure creates a force that presses the card against the mouth of the glass, which keeps the card in place.

When the glass is tilted sideways, the water can leak out and break the vacuum seal, causing the card to fall off. The force of gravity on the water pulls it towards the edge of the glass, creating a gap between the water and the card, which allows air to flow into the glass, breaking the vacuum seal.

When you place a card over the open top of a glass filled to the brim with water and invert it, the card stays in place because of the forces of air pressure and surface tension.

Air pressure is the force of the air pushing down on the top of the card. Surface tension is the force between two particles of water that creates a thin film of the liquid on the surface.

This creates an upward force which helps to keep the card in place. If the card is placed sideways, air pressure is no longer pushing down on the card, but surface tension is still helping to keep the card in place.

The card will stay in place because the water molecules are attracted to each other and form a bond which helps to keep the card in place.

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Answer:

remove the danger that lead to injury

Explanation:

The best way is

Answer:

A

Explanation: