Are materials that dissolve in water hydrophobic or hydrophilic

Answer:

Covalent bonds: bonds between nonmetals

Hydrogen Bonds: bond between hydrogens

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:

C) DC current from your car battery

Explanation:

Electromagnetic waves are waves consisting of oscillations of electric and magnetic fields perpendicular to each other.

Depending on their wavelength, electromagnetic waves are classified into 7 different types, known as electromagnetic spectrum. These types, from shortest to longest wavelength, are

Gamma rays

X- rays

Ultraviolet

Visible light

Infrared radiation

Microwaves

Radio waves

So, we see that all the following choices

A) light from your camp fire  (visible light)

B) ultraviolet causing a suntan

D) radio signals  (radio waves)

E) X-rays in the doctor's office

Are forms of electromagnetic radiation, while

C) DC current from your car battery

is not a form of electromagnetic radiation, since DC current consists of a flow of electrons.

Waves are vibration that is transmitted through a medium

The correct option which is not a form of electromagnetic radiation is option C)

C) DC current from your car battery

The reason why option C is correct is presented as follows:

Electromagnetic radiation are a type of waves that is made up of flow of energy in  the form in packets propagating as both electric and magnetic waves that can travel though vacuum (empty space) or through a medium, including radiation and waves such as gamma radiation, visible light and radio waves;

The given options A) light from your camp fire B) Ultraviolet causing suntan, D) Radio signals, and E) X-rays in the doctor's office are electromagnetic waves given that they can propagate through empty space as observed in astronomy

The option C) DC current from your car battery, is not an electromagnetic wave because, it requires a medium, the electric cable to be transmitted, and the current moves in only one direction, making it not an electromagnetic wave

Therefore, the option which is not an electromagnetic wave is option C) DC current from your car battery

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Answer:

The answer to your question is: D) Ф₂ = 49.71°

Explanation:

Data

n₁ = 1.33

Ф₁ = 35°C

n₂ = 1

Ф₂ = sin⁻¹ (n₁ sinФ₁/n₂)

Process

Substitution

Ф₂ = sin⁻¹ (n₁ sinФ₁/n₂)

Ф₂ = sin⁻¹ (1.33 sin 35/1)

Ф₂ = sin⁻¹ (1.33 x 0.574/ 1)

Ф₂ = sin⁻¹ ( 0.7628 / 1)

Ф₂ = sin⁻¹ (0.7628)

Ф₂ = 49.71°

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:

Atoms with the same number of protons but with different electrical charges are different ions

Explanation:

Ions are defined as those atoms or molecules which carry charge

Answer:

Atoms with the same number of protons but with different electrical charges are different ions.

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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F = 1440 N. The repulsion force between two identical charges, each -8.00x10⁻⁵C separated by a distance of 20.0 cm is 1440 N.

The easiest way to solve this problem is using Coulomb's Law given by the equation [tex]F=k\frac{|q_{1}*q_{2}|}{r^{2} }[/tex], where k is the constant of proportionality or Coulomb's constant, q₁ and q₂ are the charges magnitude, and r is the distance between them.

We have to identical charges of -8.00x10⁻⁵C, are separated by a distance of 20.0 cm, and we need to know the force of repulsion between the charges.

First, we have to convert 20.0 cm to meters.

(20.0 cm x 1m)/100cm = 0.20 m

Using the Coulomb's Law equation:

[tex]F = 9.00x10^{9}\frac{Nm^{2}}{C^{2}} \frac{|-8.00x10^{-5}C*-8.00x10^{-5}C|}{(0.20m)^{2} }[/tex]

[tex]F = 9.00x10^{9}\frac{Nm^{2}}{C^{2}}(1.6x10^-7\frac{C^{2} }{m^{2} } })\\F = 1440N[/tex]

"Kirchhoff's Junction Rule" and "Kirchhoff's Current Law" are the same thing.

The rule is that the amount of current flowing IN to any point in a circuit is equal to the amount of current flowing OUT of the same point.  EVEN if the point is a complicated 'junction' with a thousand different paths in and out of it  !

This whole idea is pretty obvious if you understand the law of Conservation of Electric Charge.  Charge can't be created out of nothing, and it can't disappear or be destroyed.  So whenever you see charge appear, it had to come from somewhere; and whenever you see charge disappear, it had to go somewhere.

That's exactly what's happening at the 'junction' in an electric circuit.  Current into the junction brings charge into it.  The charge can't pile up there, and it can't just disappear, so it has to leave the junction in a current that's exactly the same size as the current that brought it there.

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."

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

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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Answer: The answer is D

Explanation:

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: It would the age of the star.

Explanation:

Answer:

kenya

Explanation:

it's one of the best place to go on vacation

they've got lots of beachfront hotels. Greece, Ireland and Italy can also be included.

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: rising air

Explanation:

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:

c.it can be described as existing in time and space

The body is composed of a particular amount of matter which exist in either state of matter. The matter exist in the time and space in regard to the state of matter forming the body.

Answer: Option C

Explanation:

There are 3 states of matter which are namely, solid, liquid and gas. Anybody can only exist in either of these state in the specified time and space. That is, it can either be a solid body such as ice, or a liquid body such as water or a gaseous body such as vapors.  

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:

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.

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:

A Ray I believe since it sounds like it.

Answer:

At 4.47 seconds rock will be 3m meters from the water.

Explanation:

We need to find when will the rock be 3 meters from the water.

That is rock has traveled (34-3) meters below.

Displacement = 31 m

Since the displacement is along down we need to give negative sign.

Displacement = -31 m

Initial velocity = 15 m/s

[tex]\texttt{Acceleration}=-9.8m/s^2 \\ [/tex]

We have equation of motion

[tex]s=ut+\frac{1}{2}at^2 \\ [/tex]

Substituting

[tex]-31=15t-\frac{1}{2}\times 9.81\times t^2\\\\4.9t^2-15t-31=0\\\\t=4.47\texttt{ or }t=-1.41 \\ [/tex]

Neglecting negative time.

time, t = 4.47 seconds.

So at 4.47 seconds rock will be 3m meters from the water.

Answer:

The force required to maintain an object at a constant velocity in free space is equal to Zero.

There is no force required to maintain an object at a constant velocity in free space.

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Abraham

This story can be found in the bible, in Genesis 22. According to the story, the Lord tested Abraham's faith asking him to sacrifice Isaac his son in a mountain in the land of Moriah. Abraham traveled with his son three days until he found the place the Lord has established for the sacrifice. There, Abraham tied his son and laid him on the altar on top of a wood he had prepared. Abraham  picked up a knife to kill his son as a sacrifice but the Lord called him from heaven saying: "Do not hurt him in any way, for now I know that you truly fear God. You have not withheld from me even your son, your only son"

Venus is about 67 million miles away from the sun. It is hot there. Venus is almost the same size as planet Earth. One year on Venus is about 225 Earth days. A day on Venus is about 243 Earth days long because Venus rotates very slowly. On Venus a day is longer than a year and a year shorter than a day.

It take Venus 225 days to orbit the sun.

Answer:

[tex]4.8\cdot 10^{-19} C[/tex]

Explanation:

For a drop in equilibrium, the weight is equal to the electric force (in magnitude):

[tex]W = F_e[/tex]

where here we have

[tex]W=1.00\cdot 10^{-14}N[/tex] is the weight of the drop

[tex]F_e[/tex] is the magnitude of the electric force, which can be rewritten as

[tex]F_e = qE[/tex]

where

q is the charge of the oil drop

[tex]E=2.08 \cdot 10^4 N/C[/tex] is the magnitude of the electric field

Substituting into the equation and solving for q, we find the charge of the oil drop:

[tex]q=\frac{W}{F_e}=\frac{1.00\cdot 10^{-14}N}{2.08\cdot 10^4 N/C}=4.8\cdot 10^{-19} C[/tex]

The charge on an oil drop in equilibrium under an electric field can be found by setting the electric force equal to the gravitational force. For a drop with a weight of 1.00 × 10-14 N in an electric field of 2.08 × 104 N/C, the charge is approximately 4.81 × 10-19 C, indicating the presence of three excess electrons.

The charge on an oil drop weighing 1.00 × 10-14 N and suspended in a downward field of magnitude 2.08 × 104 N/C can be found by balancing the gravitational and electric forces. Since these two forces are in equilibrium, the electric force (F_e = qE) must equal the gravitational force (F_g = mg), where q is the charge on the oil drop, E is the electric field strength, m is the mass of the oil drop, and g is the acceleration due to gravity.

Given that the oil drop is in equilibrium:

F_e = F_g

qE = mg

Solving for q:

q = mg / E

Since the weight (mg) of the oil drop is given as 1.00 × 10-14 N and the electric field strength E is 2.08 × 104 N/C, the charge q can be calculated:

q = (1.00 × 10-14 N) / (2.08 × 104 N/C)

q = 4.81 × 10-19 C

The calculated charge will be a small multiple of the electron's charge, which is approximately -1.6 × 10-19 C. In this case, the result suggests that the oil drop has three excess electrons (3 × -1.6 × 10-19 C ≈ -4.8 × 10-19 C).

Answer:

Yo, you just kind of answered it yourself. The Electron Cloud Model is the informal way of describing an atomic orbital.

Explanation:

The analogy of the cloud of electrons is really describing the groups of electrons orbiting around said atom. Depending on the atom, there will be many or few electrons orbiting around it on all sides which can resemble an all-encompassing cloud.

The electron-cloud model is used in atomic physics to describe the behavior and location of electrons. It suggests that electrons exist in a cloud or probability distribution surrounding the nucleus. This model is based on the Heisenberg uncertainty principle.

The electron-cloud model is a model used in atomic physics to describe the behavior and location of electrons within an atom. It suggests that electrons do not move around the nucleus in fixed, predictable orbits, but rather exist in a cloud or probability distribution surrounding the nucleus.

The model is based on the Heisenberg uncertainty principle, which states that it is impossible to precisely know both the position and momentum of a subatomic particle like an electron. Instead, the electron-cloud model describes the probability of finding an electron within a certain region of space, represented as an electron cloud or cloud of probability.

This model provides a more accurate representation of electron behavior compared to the earlier Rutherford model, which depicted electrons as orbiting the nucleus in fixed paths. The electron-cloud model helps explain phenomena such as atomic bonding, electron energy levels, and electron configurations.

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