A 500-watt vacuum cleaner is plugged into a 120-volt outlet and used for 30 minutes. How much current runs through the vacuum? 900,000 amps 60,000 amps 4.2 amps 0.24 amps

According to the law of reflection, when a ray of light strikes a surface, the angle of this ray (incident ray) with respect to the normal of the surface is equal to the angle that forms the reflected ray with the same normal of the surface.

In other words:

Both the incident ray and the reflected ray and the normal to the surface are in the same plane, in addition, the angle of the incident ray is equal to the angle of the reflected ray.

In this context, when a ray strikes the surface perpendicular to it, both the incident angle and the reflected angle will be zero, since the normal to the surface is also perpendicular to it.

Final answer:

The average density of Neptune can be calculated using the given ratio of its mass to that of Uranus and the ratio of their radii.

Explanation:

To find the average density of Neptune, we can use the ratio of the mass of Neptune to that of Uranus and the ratio of their radii. The ratio of the mass of Neptune to Uranus is given as 1.19, and the ratio of their radii is given as 0.969.

Since density = mass/volume, we know the density of Uranus is 1.27 × 10³ kg/m³. We can use this information to calculate the volume of Uranus using its radius.

Using the ratio of the masses, we can find the mass of Neptune. Then, using the mass and the calculated volume of Neptune, we can find its average density.

The average density of Neptune is approximately 1.55 × 10³ kg

Answer:

C. At twice the distance, the magnitude of the field is B/2

Explanation:

The strength of the magnetic field produced by a current-carrying wire is:

[tex]B=\frac{\mu_0 I}{2\pi r}[/tex]

where

[tex]\mu_0[/tex] is the vacuum permeability

I is the current

r is the distance from the wire

If we double the distance,

r' = 2r

so the new magnetic field strength will be

[tex]B'=\frac{\mu_0 I}{2\pi (2r)}= \frac{1}{2}(\frac{\mu_0 I}{2\pi r})=\frac{B}{2}[/tex]

So, the correct option is

C. At twice the distance, the magnitude of the field is B/2

At twice the distance, the magnitude of the magnetic field is B/2 due to increase in the distance between them.

Strength of magnetic field is inversely proportional to the distance of a conductor. If the distance of an object is decrease, its magnetic field increase while on the other hand, if the distance is decrease the intensity of magnetic field on that object or charge increases.

The strength of the magnetic field at its peak near to the source but moving away from it gradually decreases the strength of the magnetic field so we can conclude that double the distance, the magnitude of magnetic field become half.

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Answer:

The image distance is 13.3 cm  ⇒ answer B

Explanation:

* Lets study the information in the problem

- The distance between the object and the convex lens is 40.0 cm

- The lens focuses light at a distance of 10.0 cm

- The equation of the image distance is [tex]d_{i}=\frac{d_{o}f}{d_{o}-f}[/tex]

 where di is the image distance, do is the object distance and f is the

 distance of the focuses lens

* Lets solve the problem

∵ do = 40.0 cm

∵ f = 10.0 cm

∵ [tex]d_{i}=\frac{d_{0}f}{d_{o}-f}[/tex]

- Substitute the values of do and f in the equation

∴ [tex]d_{i}=\frac{(40.0)(10.0)}{(40.0)-(10.0)}=\frac{400.0}{30.0}=\frac{40}{3}[/tex]

∴ di = 13.3333 ≅ 13.3 cm

* The image distance is 13.3 cm

Answer: [tex]1.212(10)^{-10} m[/tex]

Explanation:

The de Broglie wavelength [tex]\lambda[/tex] is given by the following formula:

[tex]\lambda=\frac{h}{p}[/tex] (1)

Where:

[tex]h=6.626(10)^{-34}\frac{m^{2}kg}{s}[/tex] is the Planck constant

[tex]p[/tex] is the momentum of the atom, which is given by:

[tex]p=m_{e}v[/tex] (2)

Where:

[tex]m_{e}=9.11(10)^{-28}g=9.11(10)^{-31}kg[/tex] is the mass of the electron

[tex]v=6(10)^{6}m/s[/tex] is the velocity of the electron

This means equation (2) can be written as:

[tex]p=(9.11(10)^{-31}kg)(6(10)^{6}m/s)[/tex] (3)

Substituting (3) in (1):

[tex]\lambda=\frac{6.626(10)^{-34}\frac{m^{2}kg}{s}}{(9.11(10)^{-31}kg)(6(10)^{6}m/s)}[/tex] (4)

Now, we only have to find [tex]\lambda[/tex]:

[tex]\lambda=1.2122(10)^{-10} m[/tex]>>> This is the de Broglie wavelength of the electron

Final answer:

Using the de Broglie equation, the de Broglie wavelength of an electron with a velocity of 6.00 × 106 m/s is calculated to be approximately 1.21 × 10-10 meters.

Explanation:

The de Broglie wavelength of an electron can be calculated using the de Broglie equation λ = h / (mv), where λ is the wavelength, h is Planck's constant (6.626 × 10-34 m2kg/s), m is the mass of the electron, and v is the velocity of the electron. The mass of an electron given is 9.11 × 10-28 g, which first needs to be converted to kilograms (kg) by dividing by 1000 to give 9.11 × 10-31 kg. Plugging the values into the equation: λ = 6.626 × 10-34 m2kg/s / (9.11 × 10-31 kg × 6.00 × 106 m/s), we can calculate the de Broglie wavelength to be approximately 1.21 × 10-10 meters, or 0.121 nanometers.

An interactive animation of a black hole would best enhance a reader's understanding due to its dynamic representation of gravitational effects.

The student is seeking to understand which features would enhance the reader’s understanding of a passage about black holes. In Neil deGrasse Tyson’s description, black holes are characterized by their intense gravitational pull that even light cannot escape. Given the complexity of the concept, an interactive animation of a black hole is arguably the most effective tool for understanding, as it would visually demonstrate how gravity affects space-time and objects around a black hole. A photograph provides a static image lacking explanatory power. On the other hand, while a demonstration of the speed of light informatively highlights a physical constant, it does not directly illustrate why light cannot escape. A definition of a black hole, while foundational, does not provide the dynamic understanding that an animation would.

Answer:

its c

Explanation:

trust ur homeboy

Answer is :

Mercury ( Hg)

Answer:

I think it's Mercury also known as Quicksilver

Explanation:

Prior to the knowledge of this element's toxicity, Mercury was commonly used in thermometers. It is a metal that exists in a liquid state at room temp.

Answer: rising air

Explanation:

Explanation:

The portion visible by the human eye of the electromagnetic spectrum is between 380 nm (violet-blue) and 780 nm (red) approximately.  Which  means this part of the spectrum is located between ultraviolet light and infrared light.  

Note the fact only part of the whole electromagnetic spectrum is visible to humans is because the receptors in our eyes are only sensitive to these wavelengths.

Therefore:

Answer: The magnetic lines of force enter the Earth through the South magnetic Pole.

Let's start by explaining that Earth is similar to a magnetic bar with a north pole and a south pole. This means, the axis that crosses the Earth from pole to pole is like a big magnet.

Now, by convention, on all magnets the north pole is where the magnetic lines of force leave the magnet and the south pole is where the magnetic lines of force enter the magnet.

Then, for the case of the Earth, the north pole of the magnet is located towards the geographic south pole and the south pole of the magnet is near the geographic north pole.

That is why the north pole of the needle of a compass (being a north magnetic pole) is attracted by the geographic north pole (which is a magnetic south pole), as the opposite poles are attracted.

And it is for this reason, moreover, that the magnetic field lines enter the Earth through its magnetic south pole (which is the geographic north pole).

Magnetic lines of force enter Earth at the magnetic poles. The magnetic poles are located near the geographic poles, but they are not exactly the same.

The North Magnetic Pole is currently located in northern Canada, and the South Magnetic Pole is currently located in Antarctica.

Magnetic lines of force are invisible, but they can be represented by lines that show the direction of the magnetic field. The lines of force enter Earth at the magnetic poles and exit at the opposite poles. They are strongest at the poles and weakest at the equator.

The Earth's magnetic field is generated by the movement of liquid iron in the Earth's core. The liquid iron is constantly moving, and this movement creates an electric current. The electric current, in turn, creates the magnetic field.

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Answer:

D

Explanation:

Radioactive decay is the cleanest because it is natural and stochastic. Therefore, because these radioactive elements will not occur in pure forms, the rate at which it produces radioactive particles is less compared to fusion and fission. Fusion and fission have to be manmade here on earth. Fusion, which combines lighter atoms into heavier atoms releases much energy but fewer radioactive particles compared to fission. Nuclear fission, the splitting of heavier elements to lighter elements, produces the most radioactive waste.

Answer:

D. Radioactive decay, nuclear fusion, nuclear fission

Explanation:

Radioactive decay is a natural process. In this process the rate of production of radioactive elements is less than the fusion and fusion reactions. In fusion reactions, lighter elements are combined to form a heaver radioactive elements. In these reactions energy released is very high but nuclear waste is less than fission reaction. In fission reaction larger elements are broken down in small radioactive elements. Due to this reason, fission reactions have greater nuclear waste.

The half-life of an isotope of cesium is several thousand years, meaning that it will take a very long time for the mass to halve. However, it may be another 20 thousand years before Chernobyl will be inhabitable again.

Answer:

False

Explanation:

The inner planets are called terrestrial planets due to the surfaces are solid (similar to Earth)-made up of heavy metals, either have no moons or few moons.

The outer planets are called Jovian planets or gas giants because they are encased in gas.  They all have rings with plenty of moons.

The statement "The outer planets are similar to the planet Earth; they just happen to be farther away from the Sun." is False.

Therefore, the outer planets are not similar to the Earth, so the statement is false.

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λ = 2 m.

The easiest way to solve this problem is using the equation of frecuency of a wave f = v/λ, where v is the velocity of the wave, and λ is the wavelength.

To calculate the wavelength of a microwave light travels through a liquid, it moves at a speed of 2.2 x 10⁸ m/s. If the frecuency of the light wave is 1.1 x 10⁸ Hz, we have to clear λ from the equation f = v/λ:

f = v/λ -------> λ = v/f

λ = 2.2 x 10⁸ m/s / 1.1 x 10⁸ Hz

λ = 2 m (wavelength of the microwave)

Answer:

703.58 s

Explanation:

Convert the time to seconds and distance to meters:

14 min 34.56 s = 14 × 60 + 34.56 = 874.56 s

0.750 mi × (1609 m / mi) = 1206.75 m

Now write a proportion:

874.56 s / 1500 m = x / 1206.75 m

x = 703.58 s

It would take the swimmer 703.58 seconds.

The men's world record (as of 2007) for swimming 1500 m in a long course pool is 14 min 34.56 s. At this rate, it would take 703.64 seconds for the men's world record holder to swim 0.750 mi.

The total distance covered by any object per unit of time is known as speed. It depends only on the magnitude of the moving object. The unit of speed is a meter/second. The generally considered unit for speed is a meter per second.

As given in the problem The men's world record (as of 2007) for swimming 1500 m in a long course pool is 14 min 34.56 s.

1 mile = 1609 meters

0.750 miles = 0.750 × 1609 meters

                    = 1206.75 meters

speed of swimming = 1500 / 874.56

                                  = 1.715 meters/second

Time is taken by the  men's world record holder to swim 0.750 miles,

time = distance /speed

       = 1206.75 meters / 1.715 meters/second

       = 703.64 seconds

Thus, it would take 703.64 seconds to swim.

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Answer:

object moves up

Explanation:

Answer:

The object F moves up

Explanation:

B. rotation

The torque is defined as the twisting or turning effort applied by a force. Recall that a force when acting on a body tends to produce a translational motion, but the rotational, on the other hand, is performed by the torque. When the torque acts on a body it determines an angular acceleration. Torque is important in many subjects in physics like electrical motor, gyroscopes, among others. Finally, the torque vector is defined as:

[tex]\boxed{\vec{\tau}=\vec{r}\times\vec{F}} \\ \\ Where: \\ \\ \vec{\tau}: \ Torque \\ \\ \vec{r} \ Position \ Vector \\ \\ \vec{F}: \ Force \\ \\ \times: \ Cross \ Product[/tex]

The correct option is b.

Torque is a measure of the force that can cause an object to rotate around an axis. When a torque acts on an object, it usually leads to rotation as the force applied and the distance from the pivot point (where rotation occurs) determine the strength of the torque.

In physics, a torque is a measure of the force that can cause an object to rotate around an axis. Therefore, when a torque acts on an object, it tends to produce rotation (Option B). This is because the strength of the torque depends on two aspects: the magnitude of the force applied and the distance from the pivot point (the point where the object rotates). For example, if you apply a force to open a door, the door swings open (or rotates) about the h-inges.

It correlates with Newton's second law of motion when applied to rotational motion: net force is to linear motion as torque is to rotational motion. The concept of torque is incredibly crucial in many areas, such as in the operation of car engines and in the lifting of heavy loads with a crane arm.

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Answer:

I believe the answere is B)

Explanation:

Well, as the light enters the atmosphere it meets resestance.And since the atmosphere is essentially a thick layer of chemicals in the form of gasses under pressure it isn't very smooth.So as a result, the light mainly scatters towards different dirrections.I am happy to help.Contact me if you have any further questions.

Yours sincerely,

Manos.

A compound is NOT a mixture.

A compound is not a mixture because it contains elements which are chemically combined together but a mixture contains substances which are physically combined together

A mixture is defined as substance which contains two or more constituents which can easily be separated by a physical means

However, mixtures can be separated by the following separation techniques:

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7.5 x 10⁻¹¹m. An electromagnetic wave of frecuency 4.0 x 10¹⁸Hz has a wavelength of 7.5 x 10⁻¹¹m.

Wavelength is the distance traveled by a periodic disturbance that propagates through a medium in a certain time interval. The wavelength, also known as the space period, is the inverse of the frequency. The wavelength is usually represented by the Greek letter λ.

λ = v/f. Where v is the speed of propagation of the wave, and "f" is the frequency.

An electromagnetic wave has a frecuency of 4.0 x 10 ¹⁸Hz and the speed of light is 3.0 x 10⁸ m/s. So:

λ = (3.0 x 10⁸ m/s)/(4.0 x 10¹⁸ Hz)

λ = 7.5 x 10⁻¹¹m

Answer:

Line 3 has a mistake.

Explanation:

Electromagnetic waves consist of oscillations of electric and magnetic fields that oscillate perpendicular to the each other. Therefore, Line 1 is correct.

Also, the fields in an electromagnetic waves oscillate perpendicular to the direction of propagation of the wave: therefore, they are transverse waves. So Line 2 is also correct.

Electromagnetic waves, contrary to mechanical waves, do not need a medium to propagate: so, they can also travel through a vacuum. Therefore, Line 3 is wrong.

Finally, all electromagnetic waves travel through a vacuum at the same speed, called speed of light:

[tex]c=3\cdot 10^8 m/s[/tex]

So, Line 4 is also correct.

Answer:

Line 3 is the mistake

Explanation:

Line 3 is incorrect because electromagnetic waves can travel with or without a medium, meaning they CAN travel through space.

Answer:

D Any of the above depending on the directions of forces.

Explanation:

The net force on the box depends on the direction of the forces.

For example, we have three special cases:

- If the two forces are in the same direction, they add to each other, so the net force is

F = 10 N + 10 N = 20 N

- If the two forces are in opposite directions, the net force is given by the difference between the two forces, so

F = 10 N - 10 N = 0 N

- If the two forces are perpendicular to each other, their resultant is given by the Pythagorean theorem:

[tex]F=\sqrt{(10 N)^2 + (10 N)^2}=14.1 N[/tex]

If the two forces are at any other angle, their resultant can be found by resolving each force along the x- and y- direction, and adding the components along each direction. The resultant net force will have a magnitude between 0 N and 20 N.

Final answer:

The net force on a box when two 10-N forces are applied depends on the directions of the forces: they could sum to 20 N, result in about 14 N due to perpendicular directions, or cancel out to zero if they are opposite.

Explanation:

When considering the net force acting on an object, such as a box of candy, it is critical to take into account the directions of the forces applied to the object. The net force is a vector quantity, which means it has both magnitude and direction. Therefore, the resultant force depends on how the individual forces are directed relative to one another.

If the pair of 10-N forces act in the same direction, they would add together to give a net force of 20 N in that direction. If the forces were to act at right angles to each other, they would combine to produce a net force of approximately 14 N (calculated using the Pythagorean theorem). However, if the two forces were directed opposite to each other, they would cancel each other out, resulting in a net force of zero.

Thus, the correct answer to the question is 'D Any of the above depending on the directions of forces.'

Answer: Exist naturally

Explanation: Hope This Helps ..!

The solid, inorganic portion of the earth system is known as the Lithosphere.

The lithosphere is the portion of the earth composed of rocks, minerals, and elements. also, the lithosphere is considered as the interior and the exterior of the solid earth.

The lithosphere is made up of three main types of rocks:

This type of rock is formed by the solidification of molten rocks.

This type of rock is formed by the adulteration of alteration and compression of old rock debris or organic sediments.

The alteration of existing rocks by intense heat or pressure causes the formation of Metamorphic rock.

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Answer:

When a candle burns, the chemical energy in the candle changes to light energy and heat energy. (C)

Explanation:

Did you ever light a candle and have sound or electricity come out of it ? ?

Answer:

C. light and heat

Explanation:

When the candle is burnt, the chemical energy is converted to light and heat.

Light is easily visible. Heat is dependent on the size of the candle. If a small candle is burnt heat will not be much and can only be felt if one is very close to its flame.

Sound waves and electrical energies are not created while a candle burns.

Answer:

Double replacement

Explanation:

Synthesis reaction: two or more compounds combine to form one.

A + B → C

Decomposition reaction: one compound forms two or more.

C → A + B

Single replacement reaction: an element in one compound is replaced with another element.

AB + C → AC + B

Double replacement reaction: elements in two compounds replace each other.

AB + CD → AC + BD

Answer:

B. Multi-cell line

Explanation:

A multi-cell line, or how it is more commonly known, a squall line, is basically a group of storms forming a line, like a bow, they have been seen to cover  hundreds of miles long but usually only 10 or 20 miles wide.

It is theorized that this is because when a cyclone is formed, there are two forces of "wind" one ahead and one behind, concentrating air masses as if the winds were "squishing" them to form a line.

Answer: Multi-cell Line

Explanation:

Multi-cell line storms form in a long, narrow line. While multi-cell lines may be just 10 to 20 miles wide, they can be hundreds of miles long. Multi-cell lines are known as "squall lines."

Julius Robert Mayer discovered the Law of Conservation of Energy.

Answer:

Julius Robert Mayer in 1842

Explanation:

Answer:

Covalent bonds: bonds between nonmetals

Hydrogen Bonds: bond between hydrogens

Answer:

C. Sink until it reaches equilibrium and then remain at a constant depth.

Explanation:

An object immersed in a fluid experiences buoyant force. If the net buoyant force is greater than the net weigh of the object, the object will float.

If the net buoyant force is less than the net wight of the object, it will sink until a depth where the total weight of the object and the force due to the fluid above the object equals the net buoyant force at the bottom of the object (equilibrium), then the object remains at a constant depth.

A weighted, air-filled balloon that sinks in a lake will continue to sink until the buoyant force equals its weight, at which point it reaches equilibrium and remains at a constant depth.

If a weighted, air-filled balloon sinks in a lake, it will sink until it reaches equilibrium and then remain at a constant depth. This happens because the buoyant force always acts upward on any object submerged in a fluid. However, if this force is less than the object's weight, the object will sink. The object reaches a point of equilibrium when the buoyant force equals the object's weight, causing it to stop sinking and remain suspended at a particular depth. Objects that sink, such as submarines with adjustable density (ballast tanks), demonstrate instances where they can be made to sink or float as desired, depending on the relationship between the buoyant force and the object's weight.

Answer: It would the age of the star.

Explanation: