a
matter and energy
b
numbers
production, distribution, and consumption of goods
d
speech and language

Answer:

The balloon expands in the number of particles per cubic centimeter decreases. This happens because as it expands there is a decrease in the density of area. The Dead Sea is a solution that is so dense that you easily float on it.

Answer:

1. A) Reducing the thickness of the conductor would result in increased resistance to the flow of electric current

2. D) Induced magnetism produces magnetism by placing a body within a magnetic field.

3.  C)  For an electric current to be produced, an electric potential between two bodies and a conducting path joining the bodies.

4. YOU REPEATED QUESTION 1&4.

5. C) 1/R= 1/r1 + 1/r2 + 1/r3

6. A) Silicon, commonly used in electronic devices, is classified as a semiconductor

7. B) Electrons from your hair jump to the balloon, causing it to become negatively charged on one side.

Explanation:

7. The balloon “steals” electrons from your hair, which causes one side of the balloon to become negatively charged. Since your hair lost electrons, it now has a partial positive charge. Opposite charges of static electric attract, causing them to stick together.

6. For a material to be considered a semiconductor, it must have a resistance to electric current that's too high to be considered a conductor but too low to be considered an insulator. Three common semiconductors used in electronic devices are silicon, germanium, and selenium.

5. If three components are arranged to form a parallel circuit, and the individual resistance of these components are r1, r2, and r3 respectively, the formula for finding the total resistance R is: 1/R= 1/r1 + 1/r2 + 1/r3.

4. YOU REPEATED QUESTIONS 1 & 4.

3. For an electric current to be produced, there must be an electric potential between two bodies and a conducting path joining the bodies. Two oppositely charged bodies won't produce a current unless there's a conduction path for the electrons to travel through.

2. Placing a piece of metal such as an iron bar into a magnetic field, thereby causing the bar to become magnetized, is known as induced magnetism. Typically, an object that has been magnetized in this manner will lose its magnetic properties quickly when removed from the magnetic field.

1.  The resistance to electric current increases as the cross-section of the conductor is reduced, as the conductor is lengthened, and as the conductor is heated. Replacing the conductor with a less-conductive material increases the resistance as well.

1 & 4. A) Reducing the thickness of the conductor would result in increased resistance to the flow of electric current.

2. D) Induced magnetism produces magnetism by placing a body within a magnetic field.

3. C)  The two things must exist for an electric current to be produced is an electric potential between two bodies and a conducting path joining the bodies.

5. C) The formula used to determine the total resistance of the circuit is 1/R= 1/r1 + 1/r2 + 1/r3

6. A) Silicon, commonly used in electronic devices, is classified as a semiconductor

7. B) Electrons from your hair jump to the balloon, causing it to become negatively charged on one side.

The stream of positive charges which flow from the positive terminal to the negative terminal of the battery attached in a circuit.

1 & 4. An electric potential between two bodies and a conducting path joining the bodies is required to produce current.  If all other things remain equal, changes to a closed circuit that would result in increased resistance to the flow of electric current is reducing the thickness of the conductor.

The correct option is A.

2. If an iron bar placed into a magnetic field, it become magnetized, also known as induced magnetism. The term refers to producing magnetism by placing a body within a magnetic field is induced magnetism.

The correct option is D.

3. The two things must exist for an electric current to be produced is an electric potential between two bodies and a conducting path joining the bodies.

The correct option is C.

5. If three components are arranged to form a parallel circuit, and the individual resistance of these components are r1, r2, and r3 respectively, the formula for finding the equivalent resistance R is: 1/R= 1/r1 + 1/r2 + 1/r3.

The correct option is C.

6. A semiconductor must have a resistance to electric current . Three common semiconductors used in electronic devices are silicon, germanium, and selenium.

The correct option is A.

7. The balloon transfers electrons from your hair, which causes one side to become negatively charged. Hair lost electrons, it has a partial positive charge. Opposite charges of static electric attract, causing it to stick together. So, hair stands on end when you rub it with a balloon because electrons from your hair jump to the balloon, causing it to become negatively charged on one side.

The correct option is B.

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The small electric devices that, like vacuum tubes, could receive and amplify radio signals were known as transistors.

Transistors revolutionized the field of electronics by replacing vacuum tubes, which were bulky, fragile, and consumed a lot of power. The invention of transistors, which was made by John Bardeen, Walter Brattain, and William Shockley at Bell Labs in 1947, paved the way for the development of smaller, more efficient electronic devices, such as radios, televisions, and computers.

Transistors are made of semiconductor materials, such as silicon or germanium, and they work by controlling the flow of electrons through a material. They have three main components: the emitter, the base, and the collector. When a small current is applied to the base of a transistor, it controls the flow of a larger current between the emitter and the collector, allowing the transistor to amplify signals.

Transistors are now found in nearly every electronic device, from smartphones and laptops to cars and medical equipment. They have enabled the development of smaller, more efficient, and more powerful devices that have transformed our daily lives.

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Answer: No doesn’t require any special training.

Explanation:

The construction of a scientific question doesn’t require any special training, Coming up with a scientific questions isn't supposed to be difficult and doesn't require training as a scientist.

If you've ever been curious about something, if you've ever wondered or want to know what caused something to happen, this are examples of scientific questions as they are usually driven by curiosity to know more.

The largest voltage the battery can have without breaking the circuit at the supports is 626.71 V.

The magnetic field on a current-carrying conductor is determined by the flow of current through the conductor and the distance from the carrier.

Voltage is the pressure exerted by an electrical circuit’s power source through a conducting loop to push charged electrons (“current”) through an electrical circuit to perform a function, such as turning on a light.

Given,

The length of the metal bar = 54.0 cm or 0.54 m

mass of the bar = 740 g or 0.74 kg

magnetic field acting perpendicular to the bar = 0.450 T

resistance  = 26.0

Let the maximum potential in the battery be V and the current in the circuit be I. So

V= IR

V = 26×I

I = V/21

For the rod to be in its position the magnetic force on the rod must be equal to the weight. So

magnetic force = weight

B×I×L = mg

0.45 × V/21 × 0.54 m =  0.74 × 9.8

V = 626.71 V

Thus the largest voltage the battery can have without breaking the circuit at the supports is 626.71 V.

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Answer:

Mass

Increases

Explanation:

Gravity is also affected by mass. Mass, which is the amount of matter in an object. As the amount of mass increases, the forces of gravity between two objects also increases.

I₂ molecule has the highest boiling point among the halogens. So, the correct option is d.

As we go down the group, the size of the atom increases, and so, the intermolecular forces or the dispersion force becomes stronger.

Among the halogens, I₂ molecule has the highest size and thus stronger intermolecular forces. That means, the electrons in the molecule are away from the nucleus.

Therefore Iodine molecule will have the highest boiling point among the halogens.

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here's the solution : -

we know, kinetic energy (k.e) =

\( \dfrac{1}{2} mv { }^{2} \)

where,

So,

=》

\(100 = \dfrac{1}{2} \times 0.5 \times {v}^{2} \)

=》

\( \dfrac{100 \times 2}{0.5} = {v}^{2} \)

=》

\( \dfrac{2000}{5} = {v}^{2} \)

=》

\(400 = {v}^{2} \)

=》

\(v = \sqrt{400} \)

=》

\(v = 20\: \: ms {}^{ - 1} \)

By performing a physics demonstration in front of the students. F is 9.79 x 108 newtons.

Given,

Mr. Gewanter weighs 60 kilograms (kg).

The weight of Martha is 55 kg.

d = 1.5 meters separates them.

The equation F = GMm/d2 newton determines the gravitational force between them.

changing the given values in the equation above

F = (6.673 x 1011 x 60 x 55)/1.52 = 9.79 x 108 newtons.

As a result, F = 9.79 x 108 newton is the gravitational pull Mr. Gewanter has on Martha.

A geostationary satellite travels in a circular path around the planet with a 36,000 km radius. The orbital period of a spy satellite will then be roughly (Re = 6400 km), orbiting a few hundred kilometers above the surface of the planet.

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Answer:

Vp = 1 [m/s]

Explanation:

In order to solve this problem, we must use the principle of conservation of the amount of movement. In the same way, analyze the before and after of the actions.

The moment before

The 50kg person is still hold (no movement) with the 2kg helmet

The moment after

The helmet moves at 25[m/s] in one direction, the person moves in the opposite direction, due to the launch of the helmet.

In this way we can apply the principle of conservation of movement, expressing the before and after. To the left we have the before and to the right of the equal sign we have the after.

Σm*V1 = Σm*V

where:

m = total mass = (2 + 50) = 52[kg]

V1 = velocity before the lunch = 0

(50 + 2)*V1 = (25*2) - (Vp*50)

0 = 50 - 50*Vp

50 = 50*Vp

Vp = 1 [m/s]

Answer:

Explanation:

The acceleration of an object given it's mass and the force acting on it can be found by using the formula

\(a = \frac{f}{m} \\ \)

f is the force

m is the mass

From the question we have

\(a = \frac{105}{15} \\ \)

We have the final answer as

Hope this helps you

Answer:

Explanation:

It would actually be A. 30 , as each hour of ascension (i am not sure about the correct terminology) equals 15 .

Answer:

30

Explanation:

Answer:

A

Explanation:

Chemical is a reaction between 2 things signs of that would be a new color, a new substance formed, or any sign of bubbles/smoke etc. while physical changes are done on purpose such as ripping a paper or cutting a log in half! hope that helped

The purpose of Archimedes screw is to lift water to a higher point than the source of water.

In an Archimedes screw a helical screw is enclosed in a tube. So water entering the tube is trapped in the first pocket. As the screw turns, the water trapped in the first pocket moves up to the next pocket and a new  scoop of water enters the first pocket. As the screw keeps turning the water gets risen to a higher level than the initial level.

Therefore, the purpose of Archimedes screw is to lift water to a higher point than the source of water.

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What is it?

The Archimedes Screw allows people to draw water uphill, and this was made over 2,000 years ago! This simple invention had huge implications and it has been used on everything from irrigation to bilge pumps on ships.

How is it used today?

Humans still use this device today for many different reasons. As well as being able to move water uphill, it's also used in the hydroelectric industry where the design is reversed. In other words, water flows downward through the screw, tuning it, and generating electricity.

In addition, the screw pump is used today in modern medicine to maintain steady blood flow within patients who have acute heart failure.

Explanation:

how to alweays win amoung us_

Since the diagram above shows fossils and rock features, X is an intrusion that is younger than layers Y and Z. Therefore, the correct answer option is:  intrusion, younger than layers Y and Z.

In Science, a fossil can be defined as the mineral impression or remains of both living and non-living organisms that are generally considered to be prehistoric in nature.

Additionally, rock strata (layers) that are found in various parts of the world are usually unique and different from one another because they are all composed of distinct geological history of planet Earth, which are commonly referred to as fossils.

This ultimately implies that, fossils are ancient organisms such as plants and animals that were formed into rocks.

By critically observing the rock strata (layers) shown in the image attached above, we can reasonably infer and logically deduce that X would be classified as an intrusion and it is younger than rock layers Y and Z.

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Answer:

B. No, the net force is 65 mph drag.

Explanation:

The thrust speed is given by 235 mph

The wind's drag is given as 300 mph

Now, drag is the opposite of thrust as it opposes the motion of the plane.

Excess force = thrust - drag = 235 - 300 = -65 mph

Since it's negative, it means the plane wouldn't move forward as the resisting speed is more than the thrust speed.

Thus, the plane wouldn't have enough to fly because there is a net force of 65 mph drag.

The RMS value of the magnetic field (B) will also be doubled when the RMS value of the electric field (E) is doubled. The factor by which the magnetic field changes is 2.

To provide a detailed explanation, when the RMS value of the electric field in an electromagnetic wave is doubled, the RMS value of the magnetic field also changes. The relationship between the electric and magnetic fields in an electromagnetic wave is governed by Maxwell's equations. These equations state that the electric and magnetic fields are perpendicular to each other and vary in intensity in a synchronized way.

In an electromagnetic wave, the intensity of the electric field and the magnetic field are related by a constant known as the impedance of free space. This constant determines the strength of the magnetic field for a given strength of the electric field. Therefore, if the RMS value of the electric field is doubled, the RMS value of the magnetic field will also double. This means that the strength of both fields increases proportionally.

To solve this mathematically, we first need to understand the relationship between the electric field (E) and the magnetic field (B) in an electromagnetic wave. This relationship is given by the formula:

E = c * B

where E is the RMS value of the electric field, B is the RMS value of the magnetic field, and c is the speed of light in a vacuum.

Now, if the RMS value of the electric field (E) is doubled, we have:
2E = c * B'

where B' is the new RMS value of the magnetic field. We can now express B' in terms of the original magnetic field B:
2E = c * B'
2(c * B) = c * B'
2B = B'

Hence, the RMS value of the magnetic field (B) will also be doubled when the RMS value of the electric field (E) is doubled. The factor by which the magnetic field changes is 2.

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The value that the bullwhip measure would indicate if a dampening scenario exists is less than 1. Therefore, the correct answer is the last option.

The bullwhip effect is a phenomenon of the supply chain that describes how small fluctuations at the retail level can cause larger fluctuations in demand at the distributor, manufacturer, and material supplier levels. It is measured by dividing the variance of order by the variance of demand.

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This is a hypoeutectoid alloy because the mass fraction of carbon is less than the eutectoid composition of 0.8%.

What is hypoeutectoid?
The ductility of the eutectoid alloy has decreased by the a factor of three, while that of the hypoeutectoid steel has decreased by the a factor of three. The additional, fragile cementite just on pearlite grain boundaries in hyper-eutectoid alloys reduces the alloy's ductility even more. The proeutectoid cementite limits fracture to the fragile grain boundary zone and limits plastic deformation to a ferrite lamellae inside the pearlite. Such alloys must be chosen for their composition to balance such properties to the requirements of the design in order to be used in light-strong structures. Although a front fork on the a bicycle must meet certain requirements, one of those requirements is high toughness, which necessitates tailoring this same carbon content to provide the required ductility.

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The area of the floor of a room is 132 \(m^{2}\) if the length of the room is 12 m.

To find the breadth of the room, we need to use the formula for the area of a rectangle, which is given as

Area = length × breadth

We are given the area of the room as 132 square meters, and the length of the room as 12 meters. We can rearrange the formula above to solve for the breadth.

Breadth = Area / length

Substituting the given values, we get

Breadth = 132 m² / 12 m

Breadth = 11 meters.

Hence, the breadth of the room is 11 meters.

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Answer:

It provides e.m.f!

Explanation:

A cell provides e.m.f which is the chemical energy in the cell that is converted into electrical energy. This allows electrons to move and carry current throughout the circuit!

A sprinter weighing 47 kg must apply 705 N of horizontal force to the starting blocks in order to achieve this acceleration.

acceleration describes the speed and direction changes in velocity over time.When something moves faster or slower down in a straight line, it is said to be accelerating.

Positive acceleration is a property of objects that are accelerating and travelling in the right direction.In the first illustration, positive acceleration was demonstrated by the moving car.The vehicle is accelerating as it moves forward and is travelling in a favorable direction.

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The angle at which the roadway should be banked depends on the speed of the car, the radius of the curve, and the frictional force. So, the roadway should be banked at an angle of approximately 25.4 degrees

In this case, we know the speed of the car (15 m/s) and the radius of the curve (50 m), but we are told that the frictional force is zero due to icy conditions.

In the absence of friction, the only force that keeps the car moving in a circular path is the normal force exerted by the road on the car. This force acts perpendicular to the road surface and is proportional to the weight of the car. To keep the car moving in a circular path, the normal force must be directed toward the center of the curve. This can be achieved by banking the road.

The angle at which the road should be banked can be calculated using the following formula:

tan θ = v^2 / (r * g)

where θ is the angle of banking, v is the speed of the car, r is the radius of the curve, and g is the acceleration due to gravity (9.8 m/s^2).

Plugging in the given values, we get:

tan θ = (15 m/s)^2 / (50 m * 9.8 m/s^2)
tan θ = 0.459
θ = tan^-1 (0.459)
θ = 25.4 degrees

Therefore, the roadway should be banked at an angle of approximately 25.4 degrees to allow cars to negotiate the curve at 15 m/s even if the roadway is icy and the frictional force is zero.

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The volume in liters of a 3.02kg liquid that has a density of 1.17 g/cm³ is 2.58 Litres.

Density of a liquid is the measure of the mass of the liquid contained in a unit volume.

Density of a substance can be calculated by dividing the mass of the substance by its volume. That is;

Density = mass ÷ volume

According to this question, a 3.02kg liquid has a density of 1.17 g/cm³. The volume can be calculated as follows:

Mass of the liquid in grams = 3020grams

Volume = 3020g ÷ 1.17g/cm³

Volume = 2581.19cm³ = 2.58 Litres

Therefore, the volume in liters of a 3.02kg liquid that has a density of 1.17 g/cm³ is 2.58 Litres.

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Answer:

a = 70 m/s²

Explanation:

From Newton's second law of motion, we know that when an unbalanced force is applied to an object it produces acceleration in the object in the direction of the force. Therefore,

F = ma

a = F/m

where,

a = rightward acceleration = ?

F = Rightward net force = 700 N

m = Mass of Object = 10 kg

Therefore,

a = 700 N/10 kg

a = 70 m/s²

Answer:

5m/s²

Explanation:

Initial Velocity= 40m/s

Final Velocity=60m/s

Time = 4s

a=(v-u)/t

a=60-40/4

a=20/4

a=5m/s²

Answer:

4 ohms

Explanation:

Current = Voltage/resistance

2 = 8/R

2R = 8

R = 4

Answer:

90.0

Explanation:

Because 78.8329 + 3.179=83.0119

83.0119 + 6.5263=89.5382 rounded up is 90.0000

Hope this helps have a awsome afternoon:)

Answer:

2.20 × 104 J

Explanation:

How much energy must be transferred out of the system as heat Q to lower its temperature to 0?C? ANSWER Q = 2.20 x 10^4. Cooling Power of P is 36.6 W.