why does a heating element get hot upon passing current through it? ...?

Answer:

Option (C)

Explanation:

The obstruction offered by the conductor in the path of flow of electrons is called the resistance of the conductor.

The reistance of the conductor is directly proportional to the length of the conductor and inversely proportional to the area of crossection of the conductor.

To minimize the resistance we need a wire of short length and more crossection area.

So, wire should be short and thick.

accelerate according to the applied force

Explanation:

A double replacement reaction is a reaction in which two different compounds are mixed together and both their cations and anions get exchanged with each other respectively.

When potassium bromide reacts with silver nitrate then it results in the formation of potassium nitrate and silver bromide.

The chemical reaction equation is as follows.

        [tex]KBr + AgNO_{3} \rightarrow KNO_{3} + AgBr[/tex]

Answer:

1.2 x 10^4

10^4 is 10,000

The molar mass of the newly discovered gas is approximately 58.8 g/mol. This was calculated using the Ideal Gas Law and the gas's given density, temperature, and pressure.

To determine the molar mass of a gas, you can use the Ideal Gas Law rearranged to solve for molar mass (M): = RT / , where 'm' is mass, 'R' is the gas constant, 'T' is temperature in Kelvin, 'P' is pressure, and 'V' is volume.

However, you can also use the given gas density (ρ = mass/volume = 2.39 g/L) and the Ideal Gas Law in a combined form: = / . So, the molar mass would be = (2.39 g/L * 0.0821 L atm/ K mol * (273.15 + 23.0)K ) / 0.941 atm = 58.8 g/mol.

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Today, the standard unit of time is defined in terms of electromagnetic waves emitted by cesium atoms. The correct option is A.

In physics, electromagnetic radiation is made up of electromagnetic field waves that travel through space carrying electromagnetic radiant energy.

Radio waves, microwaves, infrared, light, ultraviolet, X-rays, and gamma rays are all examples of electromagnetic waves. These waves are all part of the electromagnetic spectrum.

Because of their oscillating electric and magnetic fields, energy waves are referred to as electromagnetic (EM).

Scientists categorize them based on their frequency or wavelength, from high to low frequency, short to long wavelength.

The second is the duration of 9,192,631,770 radiation periods corresponding to the transition between the two hyperfine levels of the cesium 133 atom's ground state.

Thus, the correct option is A.

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Your question seems incomplete, the missing options are:

True, the skeletal system does protect internal organs, in addition to providing support, allowing for movement, producing blood cells, and storing minerals and fats.

True, one function of the skeletal system is indeed to protect internal organs. The skeletal system encompasses bones, cartilage, and ligaments that together provide not only support and shape to the body but also serve crucial protective functions. For example, the skull encases and safeguards the brain, the vertebral column shields the spinal cord, and the rib cage, composed of the ribs, sternum, and associated cartilage, ensures the safety of the heart and lungs, allowing for necessary movements like breathing.

The skeletal system not only protects internal organs but also has several other functions which include supporting the body, facilitating movement through its connection with muscles, and serving as a site for blood cell production. It also acts as a reservoir for minerals and helps in storing and releasing fats. This multifaceted system is essential for the overall functionality of the human body.

Answer:

D) -a small F and a large d

Explanation:

As per Pascal's law we know that the pressure applied to any point of the fluid is equally transmitted to all points of the fluid.

So here we can say that when we apply some pressure at the input point then that pressure will be equally transmitted to all points

So here we have

[tex]P = \frac{F_{in}}{A_{in}} = \frac{F_{out}}{A_{out}}[/tex]

so here in order to have large output force we can say

[tex]F_{out} = \frac{F_{in}}{A_{in}}\times A_{out}[/tex]

so we need to apply smaller force so that we will get bigger value of the distance that the jack will move upwards.

so correct answer will be

D)-a small F and a large d

Final answer:

The correct label for the side of the jack that Tas's uncle pushes on is D-a small F and a large d, as a small force is applied over a larger distance to lift the car with a hydraulic jack.

Explanation:

The question concerns the operation of a hydraulic jack, which is a common tool used to lift cars by applying force on a piston. According to Pascal's principle used in hydraulic systems, a small force applied over a larger distance on the smaller piston can result in a large force over a smaller distance on the larger piston, lifting the car. In the case of the jack's handle, where Tas's uncle is applying force, the correct label would be D-a small F and a large d, because his uncle is applying a relatively small force over a larger distance compared to the force being exerted by the jack on the car.

The correct answer is:

B. They act on different objects, so they would not appear together.

Let's take for example a box sitting on a table. If we draw the free-body diagram of the box, we would draw two forces:

- the weight of the box (downward)

- the normal reaction of the table on the box (upward)

However, this is not a pair of action-reaction forces as described in Newton's third law. In fact, the correct action-reaction pair would be:

- weight of the box (=gravitational force exerted by the Earth on the box)

- gravitational force exerted by the box on the Earth

We see that these two forces act on two different objects (the first one on the box, the second one on the Earth), so they do not appear in the same free-body diagram.

A. Minutes per gallon, because the independent quantity is the gallons

All electromagnetic waves are transverse waves and can travel through a vacuum. They travel at the same speed in a vacuum just like light, 300,000,000 m/s.

Electromagnetic radiation (EMR) is comprised of electromagnetic (EM) field wave propagates through space transporting electromagnetic radiant energy.

Radio waves, microwaves, infrared, visible light, ultraviolet, X-rays, and gamma rays are all examples of these. These waves are all part of the electromagnetic spectrum.

All waves are transverse waves that can travel through vacuum.

Thus, this factor is common in all types of waves in electromagnetic spectrum.

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Almost all of the oxygen consumed during breathing is converted to carbon dioxide and water. Oxygen is transported by hemoglobin in the blood to body tissues, where it is used for metabolism, and carbon dioxide is transported back to the lungs to be exhaled.

Almost all of the oxygen (O2) one consumes in breathing is converted to carbon dioxide (CO2) and water (H2O). In the body, oxygen is used by cells in a process called cellular respiration, where it is the final electron acceptor in the electron transport chain. The oxygen is used to oxidize nutrients, like glucose, to produce energy for the cells in the form of adenosine triphosphate (ATP). The oxidation of nutrients leads to the production of carbon dioxide and water as waste products, which are excreted from the body.

Oxygen is transported from the lungs to the tissues primarily through the binding with hemoglobin in red blood cells. As the blood passes through the body's tissues, oxygen is released from the hemoglobin and moves into the cells, where it is used for cellular metabolism. The carbon dioxide produced as a result of this metabolism is then carried back to the lungs via the blood, where it is expelled from the body through exhalation.

Took a wild guess and got it correct. The answer is B Kinetic Energy increases and potential energy decreases.

The changes in kinetic and potential energy in a roller coaster from point A to point B on a frictionless track represent a conversion of potential energy into kinetic energy, with the total mechanical energy remaining constant.

As a roller coaster begins its journey from point A (at rest and at maximum height) to point B, it experiences a transformation of energy. Initially, at point A, the coaster has a maximum amount of gravitational potential energy (PE) because it is at its highest point. As the coaster moves to point B on the frictionless track, this potential energy is converted into kinetic energy (KE).

The law of conservation of energy states that the total mechanical energy in the system remains constant if we ignore losses due to friction. In this frictionless scenario, as the potential energy decreases while the coaster descends, the kinetic energy increases proportionally. By the time the coaster reaches point B, which is at a lower height, much of its original potential energy has been transformed into kinetic energy, giving it its highest speed.

Thus, the changes in kinetic and potential energy as the roller coaster travels from point A to point B can be described as a transfer where potential energy is converted into kinetic energy, and the total mechanical energy of the coaster remains constant.

The distance to B is 20 units. The correct option is A.

The strength of the magnetic field at a point is directly proportional to the magnetic flux density at that point, which is the amount of magnetic field passing through a unit area. The magnetic flux density is related to the magnetic field strength by the equation:

B = μ₀H

where B is the magnetic flux density, H is the magnetic field strength, and μ₀ is the permeability of free space.

The distance between two points is not directly related to the magnetic field strength or magnetic flux density. However, the strength of the magnetic field at a given distance from a magnetic source decreases with the square of the distance. This is known as the inverse-square law and is expressed mathematically as:

B ∝ 1/d²

where B is the magnetic field strength and d is the distance from the source.

Here in the Question,

The magnetic field due to a long wire is given by:

B = (μ₀/4π) * (2I/r)

where μ₀ is the permeability of free space, I is the current through the wire, and r is the distance from the wire.

We are given that the magnetic field strength at point A is 200 units and at point, B is 50 units. We can set up two equations for B and solve for the ratio of the two distances:

200 = (μ₀/4π) * (2I/dA) ... (1)

50 = (μ₀/4π) * (2I/dB) ... (2)

Dividing equation (1) by equation (2), we get:

200/50 = dA/dB

4 = dA/dB

So the distance to point B is four times the distance to point A:

dB = 4dA

We are not given the distance to point A, but we can solve for it using either equation (1) or (2). Let's use equation (1):

200 = (μ₀/4π) * (2I/dA)

Solving for dA, we get:

dA = (μ₀/4π) * (2I/200)

dA = (μ₀/4π) * (I/100)

Substituting the value of μ₀/4π ≈ 10^-7 T m/A, we get:

dA = (10^-7) * (I/100)

We don't know the value of I, but we can cancel it out by taking the ratio of dA to dB:

dA/dB = 1/4

Substituting dB = 20 (since dB = 4dA), we get:

dA = 5

Now, the distance to point B is:

dB = 4dA = 4(5) = 20 units

Therefore, the answer is A) 20 units.

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Answer:

b on edg

Explanation:

Answer:

Stratified drift

Explanation:

A rock that is different in size and type when compared to the rocks that are native to the region is called a glacial erratic.

When there is an accumulation of glacial debris that is unconsolidated which occur in currently and formerly glaciated regions on Earth and is glacially formed is called morraine. Ground morraine's are deposited by glacier retreats.

Stratified drift is the type of drift caused by deposits from glacial melt-water.

An outwash plain is formed by glacial sediments deposited by melt-water outwash.

Final answer:

According to Boyle's law, the new volume of the alcohol in the flexible container at the bottom of the sea can be calculated using the equation V1P1 = V2P2, where V1 is the initial volume, P1 is the initial pressure, and P2 is the new pressure. By substituting the given values, we find that the new volume is 3.846x10⁻⁷ m³.

Explanation:

According to Boyle's Law, the volume of gas is inversely proportional to the pressure when the temperature is held constant. Therefore, we can use the equation V1P1 = V2P2 to find the new volume. Let's substitute the given values into the equation:

V1 = 1 L

P1 = atmospheric pressure = 1 atm

P2 = 2.6x10⁶ N/m²

Solving for V2, we have:

V2 = (V1 x P1) / P2

V2 = (1 L x 1 atm) / (2.6x10⁶ N/m²)

V2 = 3.846x10⁻⁷ m³

Therefore, the new volume of the alcohol in the flexible container at the bottom of the sea is 3.846x10⁻⁷ m³.

Answers:

Part A: T = [ D/2 ] [ 1 / Vr + 1 / Vw) ]

Part B: Average speed = 2 × Vr × Vw / [ Vr + Vw ]

Parte C: T = 2 D / [Vr + Vw]

1) Variables:

D = total distance

Dr = run distance

Dw = walk distance

Vr = run speed

Vw = walk speed

T = total time

Tr = run time

Tw = walk time

2) Formulas:

i) velocity = distance / time

ii) distance = velocity × time

iii) time = distance / velocity

iv) Average speed = total distance / total time

3) General table:

person---------- run ------------ walk

RicK-------------- D/2------------- D/2

Tim -------------- T /2 ------------- T /2

4) Part A. How long does it take Rick to cover the distance D?

i) T = Tr + Tw

ii) Tr = Dr / Vr

iii) Dr = D / 2

⇒ Tr = [D/2] / Vr = D / [ 2Vr]

iv) Tw = [D/2] / Vw = D / [2Vw]

v) T = Tr + Tw = [D / 2] × [ 1 / Vr + 1 / Vw ]

T = [ D/2 ] [ 1 / Vr + 1 / Vw) ] ← answer

5) Part B. Find Rick's average speed for covering the distance D.

Average speed = D / T = D × 1 / T = D × [2 / D] × [Vr×Vw] / [Vr + Vw]

Average speed = 2 × Vr × Vw / [ Vr + Vw ]

5) Part C How long does it take Tim to cover the distance?

i) Tr = Dr / Vr = T / 2 ⇒ Dr = Vr × T /2

ii) Tw = Dw / Vw = T / 2 ⇒ Dw = Vw × T /2

iii) ⇒ D = Dr + Dw = Vr × T / 2 + Vw × T / 2

⇒ D = [Vr + Vw] × T / 2

iv) ⇒ T = 2 D / [Vr + Vw] ← answer.

The state of matter that has the greatest distance between the individual particles is steam. Thus, the correct option for this question is C.

The state of matter may be characterized as one of the distinct forms in which matter can exist in nature. It is a way to describe the behavior of atoms and molecules in a substance. There are three main states of matter that are commonly found in nature. They are as follows:

The distance between the individual particles depends on the type of the state of matter. For example, a solid has the least distance between the individual particles because the particles of a solid are closely compact.

On contrary, the molecules in the gaseous states are loosely bound to each other and the intramolecular force of attraction between the particles is very low. Steam represents the example of a gaseous state of matter.

Therefore, the state of matter that has the greatest distance between the individual particles is steam. Thus, the correct option for this question is C.

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The energy released by the asteroid when it collides with Earth would be equivalent to the simultaneous detonation of about 7.19 billion nuclear bombs.

To determine the destructive energy released when a 2-km wide asteroid collides with Earth, we need to calculate its kinetic energy.

The asteroid is assumed to be spherical, with a diameter of 2 km (2000 meters). Using the formula for the volume of a sphere, V = (4/3)πr³, where r is the radius:

Radius, r = 2000 / 2 = 1000 meters

Volume, V = (4/3)π(1000)³ ≈ 4.19 × 109 cubic meters

Mass Calculation:

Given the density of the asteroid is 3200 kg/m³:

Mass, m = 3200 kg/m³ × 4.19 × 109 m³ ≈ 1.34 × 1013 kg

Kinetic Energy Calculation:

The asteroid moves at 15 km/s (15000 m/s). Using the kinetic energy formula KE = (1/2)mv², we can find:

KE = (1/2) × 1.34 × 1013 kg × (15000 m/s)² ≈ 1.51 × 1022 Joules

Comparison to Nuclear Bomb

A nuclear bomb releases about 2100 TJ (terajoules), which is 2.1 × 1012 Joules. To find the equivalent number of bombs:

Number of nuclear bombs = [tex]1.51 * 1022 Joules / 2.1 * 1012 = 7.19 * 109 bombs[/tex]

The energy released by the asteroid when it collides with Earth would be equivalent to the simultaneous detonation of about 7.19 billion nuclear bombs.

Plastic coating around electric wires are for safe use because plastic is an insulator and does not allow the current to flow.

The plastic coating is just the dipping or immersion of liquid polymers including plastic on the surface of an object.

Insulators are the substances in which electric current can not flow, actually these substances have no free electrons , these are also known as bad conductors , for example: rubber , plastic , cotton , silk , wool ,PVC , wood etc.

Hence plastic coating is wrapped around electric wire for insulation.

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Answer: electronegativity

Explanation: a covalent bond is a chemical bond. Electronegativity: an atom’s ability to attract shared electrons in a chemical bond (covalent bond is a chem bond).

The question involves adding and subtracting the vector components of three displacements and calculating the angle between the resultant vector and the z-axis. Further, it asks for the components of one displacement vector along and perpendicular to the direction of another displacement vector. These operations involve vector dot product and cross-product calculations.

To solve this problem, you first need to subtract and add the respective i, j, and k components of the three displacements: d1, d2, and d3. Calculations will give you r which is represented by three values (a), (b), and (c) for i, j, and k components respectively.

To find the angle (d) between r and the positive z-axis, you will have to use the dot product formula and the arccos function. The component of d1 along the direction of d2 can be calculated using the dot product of d1 and the unit vector in the direction of d2 (part (e) of your question). The component of d1 perpendicular to the direction of d2 and in the plane of d1 and d2, asked in part (f), can be found using vector cross-product operations and the magnitude of the resulting vector.

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The displacement vector r is (4.5i + 2.8j - 0.9k). The angle between r and the positive z-axis is approximately 16.35°. The component of d1 along the direction of d2 is -1.5 and the component of d1 perpendicular to the direction of d2 and in the plane of d1 and d2 is (3.0i + 1.8j - 5.0k).

The displacement vector r can be calculated by subtracting d2 from d1 and adding d3. In component form, r = (d1 - d2 + d3) = (1.5 - (-1.0) + 4.0)i + (1.8 - 2.0 + 3.0)j + (-5.0 + 3.0 + 2.0)k = 4.5i + 2.8j - 0.9k.

(d) To find the angle between r and the positive z-axis, we can calculate the dot product of r and the unit vector along the positive z-axis. The dot product is given by cos(θ) = (r dot k) / (|r||k|), where r dot k is the dot product of r and k. Since |k| = 1, we have cos(θ) = (r dot k) / |r|. Evaluating the dot product, we get the angle θ ≈ 16.35°.

(e) The component of d1 along the direction of d2 can be found using the dot product formula. The component is given by |d1| cos(θ), where θ is the angle between d1 and d2. Since θ = 180°, the component is 1.5 cos(180°) = -1.5.

(f) The component of d1 that is perpendicular to the direction of d2 and in the plane of d1 and d2 can be found by subtracting the component in the direction of d2 from d1. The component is given by d1 - (|d1| cos(θ)) = 1.5i + 1.8j - 5.0k - (-1.5i) = 3.0i + 1.8j - 5.0k.

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