who discovered electromagnetic induction, and who put it to practical use?

The quantity that describes how tightly packed matter is inside of an object is: a) density

The density of an object is the relation that exist between the mass and the space that the object occupies. The general formula of the density is:

ρ = m/v

Where:

For example if we want to know which is the density of a body that has a mass of 100g and a volume of 150 cm³, applying the density formula we get:

ρ = 100 g/150 cm³

ρ = 0.666 g/cm³

It is a physical quantity that expresses the ratio of the body mass to the volume it occupies.

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Answer:

Insulators such as glass, mica, rubber or plastic used to coat metals and other conductors help stop or reduce the flow of electrical current. This helps prevent shock, fires, and short circuits.

Explanation:

Oh it has ! It has ! That's exactly where you get all the energy you use to think, breathe, and move.

The displacement of a car moved 60 km east and 90 km west is 30km and the direction is west.

Displacement is defined as the shortest distance between two points covered by the body.

If we assume origin as the starting point, then distance covered by the car in east direction is =60km

Distance covered by the car in west direction is 90 km.

Since on covering 90km we again pass from the origin, it means that net positive displacement of 60 km is equal to net negative displacement of 60km.

So, remaining 30 km is the distance we moved from our starting point.

Final direction is towards west as net displacement is 30 km in west.

Hence, the displacement is 30 km and the direction is west.

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Answer:

The frequency of the swing: 1/2 Hertz

The period is: 2 Seconds

Explanation:

The time the kid takes to make a complete to-and-fro swing = 2 seconds

The period, T, is the time it takes to make one complete cycle of an oscillatory motion, therefore, we have;

The frequency, f, is the number of cycles completed each second, therefore, we have;

The time for 1 cycle = 2 seconds

2 seconds = 1 cycle

Dividing both sides by 2 gives;

2/2 seconds = 1/2 cycles

2/2 = 1

In 2/2 = 1 seconds The number of cycles completed = 1/2 cycles

Therefore, the number of cycles completed per (one) second = 1/2 cycles

Therefore the frequency of the swing, f = 1/2 cycle/seconds = 1/2 Hertz

The period, T, is the time it takes to complete one to-and-fro swing which is one cycle which is 2 seconds

Therefore, the period is 2 Seconds.

Answer:

70 m/s

Explanation:

The frequency of earthquake = 2.0 Hz

The wavelength = 35 m

How fastbthw earthquake is t traveling is given bythw velocity of the wave, velocity of wave is related to frequency and wavelength using the formula :

V = frequency * wavelength

V = 2 * 35

V = 70 m/s

Hi friend! I have an iPhone. why do you ask????

Answer:Electricity is the flow of electrons. All matter is made up of atoms, and an atom has a center, called a nucleus. When electrons are "lost" from an atom, the free movement of these electrons constitutes an electric current. Electricity is a basic part of nature and it is one of our most widely used forms of energy.

Explanation:

Answer:

Explanation:

The gravitational potential energy of a falling apple is similar to the potential difference of a battery because both are energy stored in the object

The gravitational potential energy of a falling apple is maximum when the apple is at maximum height. As the apple begins fall to the ground the potential energy decreases and it will be transformed to kinetic energy.

\(P.E_i + K.E_i = P.E_f + K.E_f\)

The potential difference in a battery is total energy stored in the battery.

Thus, the gravitational potential energy of a falling apple is similar to the potential difference of a battery because both are energy stored in the object.

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The similarity is that both the battery and the falling apple have stored energy.

We define the potential energy of an object as stored energy in that object.

A battery has potential energy, it is stored until you connect it to something and allow that energy to flow.

Similarly, when the apple is in the air it has potential energy, that will be transformed into kinetic energy as it falls (as the apple falls, its velocity increases, thus, the kinetic energy increases).

So both, the apple and the battery have stored energy, and that is the similarity between these two.

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Answer:

a) first class lever

Answer;

The mass value for the above kinetic energy equation is 400.0000 kg. This is equal to:

■ 400,000.0000 g.

■ 14,109.6000 ounces.

■ 881.8480 pounds.

The name of the substance is silver based on the specific heat capacity value.

The specific heat capacity of the substance is calculated by applying the following formula for heat capacity.

Q = mcΔθ

where;

c = Q / mΔθ

The specific heat capacity of the substance is calculated as;

c = (5875 J ) / ( 500 g x 50 )

c = 0.235 J/kgK

The substance that has the same specific heat capacity calculated above is silver.

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The amplitude of the oscillation is 0.55 cm. In simple harmonic motion, the amplitude represents the maximum displacement from the equilibrium position. To find the amplitude, we can use the relationship between the period (T) and the angular frequency (ω) of the oscillation:

T = 2π/ω

The angular frequency is related to the maximum speed (vmax) and the amplitude (A) through the equation:

vmax = ωA

Given that the period is 1.7 s and the maximum speed is 32.5 cm/s, we can calculate the angular frequency:

T = 2π/ω

1.7 s = 2π/ω

ω = 2π/1.7 s ≈ 3.69 rad/s

Using the formula for vmax:

vmax = ωA

32.5 cm/s = (3.69 rad/s)A

A ≈ 32.5 cm/s / 3.69 rad/s ≈ 8.81 cm

Therefore, the amplitude of the oscillation is approximately 0.55 cm when rounded to two significant figures.

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Answer:

What is freezing point?

A liquid's freezing point is determined at which it turns into a solid. Corresponding to the melting point, the freezing point often rises with increasing pressure. In the case of combinations and for some organic substances, such as lipids, the freezing point is lower than the melting point. The first solid which develops when a combination freezes often differs in composition from the liquid, and the development of the solid alters the composition of the remaining liquid, typically lowering the freezing point gradually. Utilizing successive melting and freezing to gradually separate the components, this approach is used to purify mixtures.

What is melting point?

The temperature at which a purified substance's solid and liquid phases may coexist in equilibrium is referred to as the melting point. A solid's temperature goes up when heat is added to it until the melting point is achieved. The solid will then turn into a liquid with further heating without changing temperature. Additional heat will raise the temperature of the liquid once all of the solid has melted. It is possible to recognize pure compounds and elements by their distinctive melting temperature, which is a characteristic number.

The difference between freezing point and melting point:

Reference: Berry, R. Stephen. "When the melting and freezing points are not the same." Scientific American 263.2 (1990): 68-75.

Explanation:

F = ma

213 N = 21.4 kg * a

a = 213 / 21.4 = 9.95 m/s^2

(a) The equation derived from energy considerations is

5v² = 318x - 5x² - 2420.

(b) To ensure the validity of the equation, x must be greater than 22 meters.

(c) The maximum value of x, when the cord is fully stretched, is approximately 4.45 meters.

(d) (i) At x = 31.8 meters, the speed of the bungee jumper is maximized according to the derived equation.

(d) (ii) The maximum speed of the bungee jumper is approximately 25.2 m/s, obtained from the equation and analysis of energy conservation.

(a) By considering energy, we can analyze the motion of the bungee jumper. Initially, the bungee jumper is at a height of 60 meters above the ground.

As the jumper falls, the elastic cord stretches and exerts an upward force on the jumper due to Hooke's Law.

The total energy of the system is conserved, and it can be divided into two components:

At the top of the fall (x = 0), all the energy is in the form of GPE:

        GPE = mgh (Gravitational potential energy)

When the bungee jumper has fallen x meters, his speed is vm m/s.

At this point, his potential energy has been converted into kinetic energy (KE) and elastic potential energy:

           KE = (1/2)mv² (Kinetic energy)

          EPE = (1/2)kx² (Elastic potential energy)

Since air resistance is negligible, the total energy remains constant:

           GPE + EPE = KE

          49 * 9.8 * 60 + (1/2)(1078)x² = (1/2) * 49 * v²

Substituting the given values:

          5v² + 318x - 5x² = 2420

(b) The equation in part (a) is derived under the assumption that the cord is taut and stretched.

(c) To find the maximum value of x, we need to determine the point at which the bungee cord reaches its maximum stretch.

              kx = mg

         1078x = 49 * 9.8

                 x = (49 * 9.8) / 1078

                 x ≈ 4.45 meters

(d) (i) To find the speed of the bungee jumper when it is at a maximum, we can differentiate the equation derived in part (a) with respect to x and set it equal to zero to find the maximum point.

Differentiating the equation:

     d(5v² + 318x - 5x²) / dx = 0

                            318 - 10x = 0

                                    10x = 318

                                        x = 31.8 meters

(ii) Now that we have the value of x at the maximum speed, we can substitute it back into the equation to find the maximum speed (vm):

       5v² + 318(31.8) - 5(31.8)² = 2420

       5v² ≈ 3178.4

         v² ≈ 635.68

        v ≈ √(635.68)

        v ≈ 25.2 m/s

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Answer:

Social media has helped many businesses grow and promote itself, and has helped people find a better way to connect and communicate with one another. On the other hand, it's also provided many people with problems involving mental health, emotional insecurities, and waste of time

Explanation:

what they said is correct

We are given that an object is launched with an initial height and we are asked to determine its maximum height. To do that we will determine first the time it takes the object to reach the maximum height which is given by the following formula:

Where:

Replacing the values we get:

Solving the operations we get:

Now, to determine the height associated with this time we will use the following formula:

Where:

In this case, the initial height is 40 meters. Replacing the known values:

Solving the operations:

Therefore, the maximum height the ball reaches measured from the ground is 64.61 meters.

Now we are asked to determine the final velocity of the object. To do that, we will use the following formula:

Where:

Now we solve for the final velocity first by adding the square of the initial velocity:

Now we take the square root to both sides:

Replacing the known values:

Solving the operations:

Therefore, the final velocity is 35.6 meters per second directed towards the ground.

Now we are required to determine the time the object stays in the air. To do that we will use the following formula:

We will solve for "t" first by subtracting the initial velocity from both sides:

Now we divide both sides by the acceleration of gravity with the negative sign:

Now we replace the values, but we need to have into account that since the final velocity is directed towards the ground its sign is negative:

Solving the operations:

Therefore, the cannonball's total time is 5.87 seconds.

The main driving force thought to be behind the slowing of the Gulf Stream is believed to be climate change. As the atmosphere and oceans warm, the Gulf Stream is losing heat to the atmosphere.

The Gulf Stream is a powerful ocean current that originates in the Gulf of Mexico and flows northward along the eastern coast of the United States. It is part of the North Atlantic gyre, a system of circulating ocean currents. The Gulf Stream is an important part of the global conveyor belt, a system that helps regulate the ocean's climate by transporting warm tropical waters to cooler regions of the world. The Gulf Stream is so powerful that it is able to move more water than all of the world's rivers combined. It transports more than 100 million cubic meters of water per second and has a maximum speed of up to 5.6 km per hour.

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Answer:

30MPH

Explanation:

30/5 = 6 x 5 = 30 mph

The magnitude of the electric force on the charge is 5 N.

The magnitude of force on the charge is calculated as follows;

F = Eq

where;

F = 100 N/C  x 0.05 C

F = 5 N

Thus, the magnitude of the electric force on the charge is 5 N.

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Answer:

5n downward

Explanation:

took the assignment

The potential energy of the ball has increased during energy transfer.

If the ball rolls and stops, the kinetic energy from rolling and friction turns into potential energy.

Potential energy is relative position, kinetic energy is relative to motion.

The main relationship between the two is their ability to transform into each other. That is, potential energy turns into kinetic energy, kinetic energy turns into potential energy, and back again. It's an endless cycle.

Let's look at another example. Suppose there is a book on the table.

When the book is at rest, it has potential energy. However, if you accidentally drop it off the table, that potential energy is converted into kinetic energy, causing the book to move and fall. However, as soon as the book hits the ground, this kinetic energy is converted into potential energy.

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Answer: 5. 9000 meters

6. 0.12626 miles

7. 26.78 meters

8. 1 mile per minute

9. 468 km per hour

Explanation:

5. 1000 m=1 km

9 km * 1000 m/1 km=

9 * 1000/1 = 9000 meters

6. 63360 inches = 1 mile

8000 inches * 1 mile/63360 inches=

8000/63360=0.12626 miles

7. 100 cm=1 m

2678 cm * 1 m/100 cm=

2678 * 1/100=

2678/100=26.78 meters

8. 60 minutes=1 hour

60 mph * 1 hour/60 minutes=

60 * 1/60=1 mile per minute

9. 1000 m=1 km

1 hour=60 minutes

1 minute=60 seconds

60 seconds * 60 minutes/1 hour=

60 * 60/1=3600 seconds

130 meters * 3600 seconds/1 second=

130 * 3600/1=468000 meters per hour

468000 m* 1 km/1000 m=

468000 * 1/1000=468 km per hour

The final image is formed by two converging lenses at 15.3 cm in front of the second lens and the magnification of the system is -0.99.

To find the location of the final image, we can use the lens formula:

1/f = 1/do + 1/di

where f is the focal length of the lens, do is the object distance, and di are the image distance.

For the first lens, f = 14.8 cm and do = 30.0 cm. Plugging these values into the lens formula gives:

1/14.8 = 1/30 + 1/di

Solving for di, we get:

di = 20.1 cm

This means that the first lens forms an image 20.1 cm behind it, which serves as the object for the second lens.

Using the lens formula again for the second lens, f = 14.8 cm and do = 39.7 - 20.1 = 19.6 cm. Plugging these values into the lens formula gives:

1/14.8 = 1/19.6 + 1/di

Solving for di, we get:

di = 9.1 cm

Therefore, the final image is formed 9.1 cm behind the second lens.

To find the magnification of the system, we can use the formula:

m = - di/do

where m is the magnification, di is the image distance, and do is the object distance.

Plugging in the values we found, we get:

m = -9.1/30.0 = -0.303

Therefore, the magnification of the system is -0.303, which indicates that the image is inverted and smaller than the object.

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Answer:

C) 7.0x10^-8 m to 8.5x10^-8 m.

Explanation:

Based on the given information, the antennae of the creatures on Planet Omega are most sensitive to wavelengths that range from 7.0x10^-8 m to 8.5x10^-8 m.

Answer: 63.43 m

Explanation:

Given

Car lands 68.38 m away from the base of the garage

Stuntman drove the car with speed \(u=19\ m/s\)

Since there is no acceleration in the horizontal direction, so there is no change in velocity

\(\Rightarrow 68.38=19\times t\\\Rightarrow t=3.598\ s\)

time taken to cover 68.38 m is 3.598 s

In this time car travels a vertical distance of h

Such that we can write

\(\Rightarrow h=u_vt+\frac{1}{2}at^2\\\\\Rightarrow h=\frac{1}{2}gt^2\\\\\Rightarrow h=0.5\times 9.8\times (3.598)^2=63.43\ m\)

Answer:

I'm not completely sure, but I believe the first and third of the three are mechanical.

Explanation:

Chemical potential isn't moving or about to go into motion. It can't be mechanical.

Radiative energy is the energy carried by light.

What is radiative energy?

Radiative energy is the energy carried by light. It is a form of energy that can be transmitted through space without requiring a medium for it to move through. Radiative energy can come from natural sources like the sun or artificial sources like light bulbs.

Radiative energy is important for a variety of reasons. For one thing, it is the primary source of energy for many living organisms on Earth, particularly plants. Energy from the sun helps plants photosynthesize and produce food that they can use to grow and reproduce.

Radiative energy is also important for human life. It is used in a variety of ways, including in the form of light for illuminating spaces and in the form of heat for cooking and keeping warm. Understanding the nature and properties of radiative energy is important for a wide range of scientific and technological fields.

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If alien beings found one of the Voyager spacecraft in a million years, they would find a time capsule of human knowledge and culture, providing valuable insights into our civilization. The spacecraft carries a golden record containing images, sounds, and greetings from Earth, representing the diversity and achievements of humanity.

The Voyager spacecraft, launched in 1977, carries a collection of artifacts intended for extraterrestrial beings. The golden record contains a variety of information, including greetings in multiple languages, images of Earth, sounds of nature, music from different cultures, and recorded messages from prominent figures of that time. This comprehensive collection was carefully curated to showcase our species' creativity, scientific knowledge, and cultural diversity. The records also include instructions on how to play the audio and view the images, providing a glimpse into the technological capabilities of our civilization. If discovered by alien beings in the distant future, the Voyager spacecraft and its contents could serve as a testament to humanity's existence and aspirations.

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