20. Which of the following is an accurate statement?
A. DC generators produce current with a voltage that changes from positive to negative
B. AC generators produce current that's pulsating but always remains positive,
C. Step-up voltage transformers have fewer turns in the primary than in the secondary winding.
D. Step-down voltage transformers have a different number of turns in the primary than in the secondary winding, so they change the incoming voltage to a higher voltage​

Answer:

B. Magnetic Force

Explanation:

two pieces of irons cannot attract each other unless at least one of them is magnetize. That force is called magnetism.

Answer:

6.20×10⁴ V/m

Explanation:

The magnitude of electric field is:

E = √(Eₓ² + Eᵧ²)

where Eₓ = ∂φ/∂x and Eᵧ = ∂φ/∂y.

φ = 1.11 (x² + y²)^-½ − 429x

Eₓ = -0.555 (x² + y²)^-(³/₂) (2x) − 429

Eᵧ = -0.555 (x² + y²)^-(³/₂) (2y)

Evaluating at (0.003, 0.003):

Eₓ = -44034 V/m

Eᵧ = -43605 V/m

The magnitude is:

E = 61971 V/m

Rounded to three significant figures, the strength of the electric field is 6.20×10⁴ V/m.

Answer:

-THE STIFFNESS OF THE SPRING

-THE FORCE APPLIED TO THE SPRING

-THE DISTANCE THE SPRING IS STRETCHED

Explanation:

Spring stiffness applied force, and stretched distance can most directly affect the motion of a spring.

The force required to extend or compress a spring by some distance scales linearly with respect to that distance is known as the spring force.

Its formula is

F = kx

The factors can most directly affect the motion of a spring:

The stiffness of the spring.

The forces applied to the spring.

The distances the spring is stretched.

Hence, spring stiffness applied force, and stretched distance can most directly affect the motion of a spring.

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Answer:

c. the volume of the part of the ship that lies below the water's surface.

Explanation:

As stated in the problem, Archimedes' Principle tells us that that buoyant force on an object is equal to the weight of fluid it displaces.  The volume of water that a ship displaces is the volume it occupies below the surface.

Answer:

B

Explanation:

Took on Edge 2022

Answer:

i believe it is isopropane. sorry if this isnt helpful, but i believe thats correct

Explanation:

Answer:

Ethyne

Explanation:

gradpoint

I believe chemical change is the correct answer.

Silver is a chemical so it certainly will not deal with physical change or physical property.

It cannot be a property since it consists of only one element which is silver.

Cleaning tarnished silver is an example of chemical change, therefore the correct answer is option A.

A chemical reaction is a process in which one or more substances, also known as reactants are converted to one or more different substances, known as products.    

A chemical bonding between a metal and a nonmetal molecule, often oxygen and sulfur dioxide, results in a tarnish.

The result of a chemical interaction between a metal and a non-metal substance like oxygen or sulfur oxides is a tarnish.

Since polishing tarnished silver is an example of a chemical change, option A is the appropriate response.

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Answer:Kg is the unit of mass. So a 5kg object has a mass of 5kg. The weight you associate with it is only relevant on Earth (under its specific gravity) and in fact really the kilogram-force measurement which is measured in Newtons (5kg x 9.8m/s2 = 49.2N). ... Commonly, it means the object weighs 5kg

Explanation:

This is not my answer

Final answer:

A body with a mass of 5 kg contains an amount of matter equivalent to 5 kilograms. Mass is a measure of the amount of matter and inertia in an object, measured in kilograms using a balance. One second is the time duration of over 9 billion periods of the radiation of the cesium-133 atom.

Explanation:

Understanding Mass and Its Measurement

When a body has a mass of 5 kg, it means that the body contains matter equivalent to 5 kilograms. Mass is a property of an object that quantifies its amount of matter and its inertia. Inertia is the object's tendency to maintain its state of motion. The mass does not change regardless of the location because it is independent of external forces like gravity. In contrast, weight is the force on a body due to gravity and can vary with the change of gravity in different locations.

Mass is measured using a balance that compares the object to a standard mass, such as a known weight or the International Prototype Kilogram, which is a cylinder made of a platinum-iridium alloy kept at the International Bureau of Weights and Measures in France. The standard unit of mass in the International System of Units (SI) is the kilogram (kg).

Definition of One Second

One second is the duration of 9,192,631,770 periods of radiation corresponding to the transition between two hyperfine levels of the ground state of the cesium-133 atom at 0 kelvin. It is a unit of time in the International System of Units (SI).

Answer:

B. 171 N

Explanation:

The equation of the forces along the horizontal and vertical directions are:

Horizontal:

[tex]T_2 cos 62^{\circ} = T_1 cos 20^{\circ}[/tex] (1)

Vertical:

[tex]T_1 sin 20^{\circ} + T_2 sin 62^{\circ} = W[/tex] (2)

Where W = 180 N is the weight of the box.

From (1),

[tex]T_2 \frac{cos 62^{\circ}}{cos 20^{\circ}} = T_1 [/tex]

Substituting into (2),

[tex](T_2 \frac{cos 62^{\circ}}{cos 20^{\circ}}) sin 20^{\circ} + T_2 sin 62^{\circ} = W\\T_2 (cos 62^{\circ} tan 20^{\circ}+sin 62^{\circ})=W\\T=\frac{W}{cos 62^{\circ} tan 20^{\circ}+sin 62^{\circ}}=171 N[/tex]

The tension T2 in the rope is equal to the weight of the box, which is 180 Newtons.

To find the tension T2, we need to analyze the forces acting on the box. From the figure, we can see that there are two forces acting on the box: the weight of the box, which is 180 Newtons acting vertically downwards, and the tension T2 in the rope. Since the box is in equilibrium, the sum of the forces in the vertical direction must be zero. This means that the tension T2 must be equal to the weight of the box, which is 180 Newtons. Therefore, the correct answer is 180 Newtons.

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Answer:

Explanation:

The sound moves in the form of waves. The amplitude is the distance between the highest and the lowest point of a wave.  In this way the amplitude indicates the amount of energy that a sound signal contains.

Intensity is the amount of acoustic energy that a sound contains. Intensity is measured in decibels. Volume is a measure of the energy that a signal carries, being a magnitude of intensity.

In this way it is possible to say that the energy of a signal is closely related to its amplitude, but its development over time is also important.

The tone or height is the quality that distinguishes between a high or low sound and a low or high sound.

Answer:

Frequency of orange light = [tex]5 \times 10^{14}[/tex] Hz

Explanation:

We are given the wavelength of the orange light and we are to find the value of its frequency.

Wavelength of orange light = [tex]6.0 \times 10^{-7} m[/tex]

We know that:

Speed of light = Frequency of orange light × Wavelength of orange light

Substituting the values in the above formula:

[tex]3 \times 10^8[/tex] = Frequency of orange light × [tex]6.0\times10^{-7}[/tex]

Frequency of orange light = [tex]\frac{3 \times 10^8}{6\times10^{-7}} =5 \times 10^{14}[/tex] Hz

Answer:

S- waves

Explanation:

S- waves are known as secondary waves or shear waves. They only propagate through solid medium only.

S- waves are elastic seismic waves that propagates transversely moving materials perpendicularly along their direction. In the process, they cause shearing. Only solids have enough shear strength to withstand the movement of s-waves without getting altered. Liquids and gases cannot shear and would not allow s-waves to propagate through them.

Answer:NO

Explanation:

No, because as it swings it is mechanical energy that changes from almost completely potential energy to almost completely kinetic energy and thermal and sound.

Answer:

B. 238.59 N

Explanation:

First, use their weight on Earth to find their mass:

W = mg

90 N = m (9.8 m/s²)

m = 9.18 kg

Now use this mass to find the new weight on Jupiter.

W = mg

W = (9.18 kg) (25.98 m/s²)

W = 238.59 N

Answer:

V=240 volts

Explanation:

V=IR

V=15*16

hmax = 5740.48 m. The maximum height that a cannonball fired at 420 m/s at a 53.0° angles is 5740.48m.

This is an example of parabolic launch. A cannonball is fired on flat ground at 420 m/s at a 53.0° angle and we have to calculate the maximum height that it reach.

V₀ = 420m/s and θ₀ = 53.0°

So, when the cannonball is fired it has horizontal and vertical components:

V₀ₓ = V₀ cos θ₀ = (420m/s)(cos 53°) = 252.76 m/s

V₀y = V₀ cos θ₀ = (420m/s)(cos 53°) = 335.43m/s

When the cannoball reach the maximum height the vertical velocity component is zero, that happens in a tₐ time:

Vy = V₀y - g tₐ = 0

tₐ = V₀y/g

tₐ = (335.43m/s)/(9.8m/s²) = 34.23s

Then, the maximum height is reached in the instant tₐ = 34.23s:

h = V₀y tₐ - 1/2g tₐ²

hmax = (335.43m/s)(34.23s)-1/2(9.8m/s²)(34.23s)²

hmax = 11481.77m - 5741.29m

hmax = 5740.48m

Answer:

5740.48

Explanation:

The term 'Theory' best describes the phrase as it refers to a well-substantiated explanation of some aspect of the natural world, that has been repeatedly tested and confirmed through the scientific method.

The term that best describes the phrase 'the best explanation that science has to offer' is Theory. In scientific terms, a 'theory' is more than just a guess. It is a well-substantiated explanation of some aspect of the natural world that is acquired through the scientific method, and repeatedly tested and confirmed through observation and experimentation.

Laws are generally observed patterns that apply universally. Experiments are practical procedures undertaken to derive or validate a fact, and Observation is the act of gathering and analyzing data. These are all integral components of scientific investigation, but the term 'theory' is the one that aligns most closely with 'the best explanation'.

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Answer:

tan (x eˣ) + C

Explanation:

∫ (eˣ + x eˣ) / (cos² (x eˣ)) dx

First, use u-substitution.

u = x eˣ

du = (eˣ + x eˣ) dx

∫ 1 / (cos² u) du

∫ sec² u du

tan u + C

Substitute back:

tan (x eˣ) + C

Answer:

Increase. As the water increases, so will the strawberries if watered evenly throughout

The wire with the least resistance at 20 degrees Celsius, given the same length and diameter, would be gold due to its lower resistivity compared to aluminium, nichrome and tungsten.

The resistance of a wire depends on its material's resistivity, length, and cross-sectional area. In this case, the wires are of the same length and diameter, so the wire with the least resistance would be the one with the lowest resistivity. Comparing the different materials listed, gold, aluminum, nichrome, and tungsten, we find that gold has the lowest resistivity, so it would have the least resistance at 20 degrees Celsius.

It's worth noting this concept with the base of Ohm's law. In general, materials with good conductivity, like gold, copper, and aluminum, are referred to as ohmic materials where the resistance remains essentially the same for a wide range of voltage and current. This is due to the abundant free electrons in these metals that allow for easy flow of electric current thereby reducing resistance.

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When comparing aluminum, gold, nichrome, and tungsten wires of the same length and diameter at 20 degrees Celsius, the gold wire would have the least resistance due to gold's low resistivity.

The ability of a material to resist the flow of electrical current is measured as resistance. In this case, we are comparing the resistance of different types of conducting wires at the same temperature, length, and diameter. From the given options, which include aluminum, gold, nichrome, and tungsten, the wire that would have the least resistance, other factors being equal, would be gold.

The reason for this is that gold, amongst these options, has the lowest resistivity. Resistivity is the property of a material that determines the resistance of a wire made from that material. It basically measures how strongly the material opposes the flow of electric current.

In the case of gold, it is one of the most conductive materials known, meaning it has very low resistivity, and therefore a gold wire would have lower resistance than wires made from the other materials listed. While silver actually has the highest conductivity and lowest resistivity of any metal, it is not one of the options presented in this question.

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Energy loss. Figure 1. Energy losses in an incandescent light bulb are very large; most of the input energy is lost in the form of heat energy. When energy is transformed from one form to another, or moved from one place to another, or from one system to another there is some energy loss.

There is some energy loss when it is changed from one form to another, and relocated from one location to another.

Energy is a quantifiable quality that may be transferred to a body or a physical system and is noticeable when labor is done as well as when heat and light are produced.

An incandescent light bulb has significant energy losses; the majority of the input energy is dissipated as heat energy. There is some energy loss when it is changed from one form to another, relocated from one location to another, or moved from one system to another.

There is some energy loss when it is changed from one form to another, relocated from one location to another, or moved from one system to another. This implies that some of the incoming energy is transformed into a highly disordered form of energy, such as heat, when energy is transformed into a new form.

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Answer:

D

Explanation:

If in a given reaction the energy of products is greater than the energy of reactants it means that reaction is endothermic and during the reaction, the energy is absorbed by reactants. In an endothermic reaction, the products have more stored chemical energy than the reactants. And in this reaction the reactants are more stable than products before the compounds with less energy are always more stable.

Answer:

B

Explanation:

In science, it is understood that energy cannot be created, nor destroyed, it can only change form. Hence, certain reactions require a lot of energy, since their products have a higher energy than their reactants, or they release energy because their products have less energy than their reactants.

A: Is incorrect, because a reaction will not absorb energy if the products have less energy than the reactants.

B: Is correct, because in a reaction where the products have less energy, there will be a release of energy into the environment (usually heat).

C: Is incorrect, because there is always a transfer of energy in a chemical reaction.

D: Is incorrect, because energy cannot be "lost". It may be released into the environment, but it cannot be lost.

The substance with the highest specific heat is water. The correct option is D

Water has a specific heat capacity of about 4.186 joules per gram per degree Celsius (J/g°C), which is significantly higher than most other substances. This means that it requires a large amount of heat energy to raise its temperature by a given amount compared to other materials like soil, mud, or sand.

Due to its high specific heat, water can absorb and store a substantial amount of heat during the day and release it slowly at night, moderating temperature changes in the surrounding environment. This property is essential for maintaining stable climates in various ecosystems and has a significant impact on Earth's weather patterns. In conclusion, water's high specific heat makes it a crucial factor in regulating the planet's temperature and climate.

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As the distance between two charged objects increases, the strength of the electrical force between the objects  decreases.

Answer: Decreases

Explanation:

got it right on the assignment. Hope this helps peeps! :]

Explanation:

Mechanical advantage is the ratio of output force to input force.

MA = 2000 N / 120 N

MA = 16.67

Round as needed.

Answer:MA = 2000 N / 120 N

MA = 16.67

Explanation:

Start with the conservation of energy. The spring potential energy and the mass' kinetic energy will fluctuate over time, but their sum will stay constant. The maximum spring potential energy equals the maximum kinetic energy.

0.5mv² = 0.5kx²

m is the mass, v is the maximum velocity, k is the spring constant, and x is the maximum displacement along the spring.

Given values:

m = 4.1kg

v = 0.78m/s

Calculate the maximum kinetic energy.

Max KE = 0.5mv² = 1.247J

Set this equal to the maximum spring potential energy.

Max spring PE = 0.5kx² = 1.247J

x² = 2.494/k

The spring force is F = kx

Max F = kx = 13N

x = 13/k

x² = 169/k²

Set both values of x² equal to each other and solve for k the spring constant:

2.494/k = 169/k²

2.494k = 169

k = 67.8N/m

Use k to find x:

Max F = kx = 13N

67.8x = 13

x = 0.192m

The frequency of the system is given by:

f = (1/(2π))√(k/m)

f is the frequency, k is the spring constant, m is the mass.

f = (1/(2π))√(67.8/4.1)

f = 0.647Hz

The amplitude is the maximum distance from the mean position. The amplitude for the motion for the given mass is 2.658 m.

[tex]V_{max } = 2\pi fA[/tex]

For Amplitude:

[tex]A = \dfrac { V_{max}}{2\pi f} [/tex]

Where,

[tex]V_{max } [/tex] - maximum velocity of the mass =  0.78 m/s

[tex]f[/tex] - force exerted on the object  = 13  N

[tex]A[/tex]- amplitude = ?

Put the values in the formula and solve it for [tex]A[/tex],

[tex]A = \dfrac {13 }{2\pi \times 0.78 } \\\\ A = \dfrac {13}{4.89}\\\\ A = 2.658[/tex]

Therefore, the amplitude for the motion for the given mass is 2.658 m.

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Answer:

B. Generator

Explanation:

A turbine (meaning "turbulence") is a rotary mechanical device that extracts energy from a fluid flow and converts it into useful work. The work produced by a turbine can be used for generating electrical power when combined with a generator  So I prefer to go with option B. generator

Answer:

B. Generator (for Plato/Treca)

Explanation:

A turbine spins to create electricity, therefore, making it a generator.

Answer:

D) all different and specific to each

Explanation:

I just finished the test.