50 POINTS HELP ME PLEASE!!!!!!!!!!!!

Which arrows represent the way a person should go to escape the rip current?


W and X

X and Y

Y and Z

Z and W

Answer:

40 A, current is from B to A

Explanation:

The current in a wire is defined as:

[tex]I=\frac{q}{t}[/tex]

where

q is the amount of charge passing a given point of the wire in a time interval t

The charge passing through a given point can be written as

[tex]q=Ne[/tex]

where

N is the number of electrons

[tex]e=1.6\cdot 10^{-19}C[/tex] is the charge of one electron

So we can rewrite the equation as

[tex]I=\frac{Ne}{t}[/tex]

In this problem:

[tex]N=25\cdot 10^{21}[/tex] is the number of electrons

t = 100 s is the time interval

Substituting, we find the current:

[tex]I=\frac{(25\cdot 10^{21})(1.6\cdot 10^{-19})}{100}=40 A[/tex]

Moreover, the direction of a current is defined as the direction of positive charges moving. Here, the charge carriers are electrons (which are negatively charged), so the direction of the current is opposite to the direction of motion of the electrons: therefore, since the electrons move from A to B, the direction of the current is from B to A.

Answer:

[tex]f=9.9269\,\,10^{19} Hz[/tex]

Explanation:

Recall that the velocity (v) of a light wave is defined as the product of its frequency (f)  times its wavelength ([tex]\lambda[/tex]) :

[tex]v=f*\lambda[/tex]

therefore, we can solve for the unknown frequency by dividing both sides of the equation by the frequency:

[tex]v=f*\lambda\\2.99\,\,10^{8} \frac{m}{s} = f *\,3.012\,\,10^{-12}\, m\\\frac{2.99\,\,10^8}{3.012\,\,10^{-12}} \frac{1}{s}=f\\ f=0.99269\,\,10^{20}\,\, \frac{1}{s}\\[/tex]

Since the units "1/second" are what we call Hertz (Hz), the answer can also be given as:

[tex]f=9.9269\,\,10^{19} Hz\,[/tex]

Answer:

f=9.93 × 1019 Hz

Explanation:

Use the relationship  f=vλ  to solve for frequency f. Substituting the known quantities yields:

f=vλf=2.99 × 108  m/s3.012 × 10-12 mf=9.926×1019  

answer rounded off to 3 significant digits is

f=9.93 × 1019 Hz

Answer:

Explanation:

I would say all of them are affected by gravity- everything on the planet of earth is affected by gravity it pushes everything back down, however, if I had to make a guess I would say baseball because there is more gravity applied to the force of the ball than there is used in any other game listed.

Answer:

The bowlingball because it is the heavest which will cause it to fall faster thus showing it is the most affected by gravity.

Explanation:

Answer:

A. person in roller coaster

Explanation:

Answer:

40 degrees

Explanation:

The angle is reflected at the same degree.

Answer:

more than

less

Explanation:

The power of a car engine is far more than the power of a bicycle because a car engine does the same amount of work in less time.

Energy transfer or conversion rate expressed in terms of power. The watt, which is equal to one joule per second in the SI Units, is the unit of power. Power may also be referred to as activity in earlier writings. A scalar concept is power.

Power is correlated with other factors; for instance, the gripping force on the tires and the vehicle's velocity are the product to determine the power required to move a ground vehicle. A motor's output power is calculated as the sum of the torque it produces and the angular speed of its output shaft.

As we know that the car and other vehicles are powered by machines but on the other side bicycles, carts, etc. are operated by human force, so the power of car engine is more than bicycle, and it does the same work in less time as compared to bicycle.

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Answer:

The truck has more momentum

Explanation:

The truck has more momentum as its mass is heavier than the bicycle.

To calculate momentum the formula is

P=mv

If the mass is greater then the momentum will increase assuming the velocity is the same

Answer:

Newton's second law of motion is F = ma, or force is equal to mass times acceleration. Learn how to use the formula to calculate acceleration.

Explanation:

a)

When a plastic rod is rubbed with wool, charging by friction occurs.

This is one of the three mechanisms of charging an object: in this particular case, as the rod is rubbed with the wool, electrons jump from the wool to the rod.

As a result, the plastic rod will remain with an excess of electrons (negative charge), while the wool will remain with a lack of electrons (positive charge).

However, the number of electrons gained by the rod is equal to the number of electrons given off by the wool: therefore, the total net charge of the system rod + cloth has not changed.

b)

When the rod touches sphere A, some electrons are transferred from the rod to the sphere (this method of charging is called charging by conduction).

Then, the sphere A will also remain negatively charged, as well as the plastic rod.

Later, the rod is brought close to sphere A without touching it: here, the electrons in the rod repel the electrons in the sphere (like charges repel each other), so the rod and the sphere will repel each other.

c)

Before part b), the negative charge on the plastic rod was equal to the positive charge on the wool.

After part b), the plastic rod has given off part of its electrons to sphere A. As a result, the negative charge on the plastic rod will be now less than the positive charge on the wool.

Therefore, the net charge of the rod + wool system will now be positive.

d)

The electrostatic force between two charged object is:

- Attractive if the charges on the objects have opposite sign

- Repulsive if the charges on the objects have same sign

Since sphere A is charged negatively, when it is brought close to sphere B, the electrons in sphere B will be attracted on the opposite side relative to sphere A, while the positive charges will migrate close to sphere A. Therefore, the two spheres will attract each other, since opposite charges attract each other.

e)

When the plastic rod (which is negatively charged) touches sphere B, some electrons are transferred to sphere B (charging by induction). As a result, charge B will also be negatively charged now, as it has an excess of electrons.

At the same time, sphere A is also negatively charged. Therefore, as like charges repel each other, this means that the two spheres will now repel each other.

f)

The net charge of the rod and the two spheres is negative.

In fact, the electrons given off by the rod to the two spheres were initially on the rod itself: this means that the total net charge of the rod + 2 spheres is equal to the net charge on the rod before the process.

Since the net charge on the rod before the process was negative, then the net charge of the system consisting of the rod + 2 spheres must be negative as well.

g)

When a glass rod is rubbed with silk, charging by friction occurs, similar to part a). However in this case, the glass rod gives off electrons to the silk: therefore, the glass rod remains positively charged.

Later, the glass rod touches sphere B: as a result, positive charge is transferred from the rod to sphere B, so sphere B will remain positively charged.

In the meantime, sphere A is negatively charged: since opposite charges attract each other, this means that now sphere A and sphere B will attract each other.

h)

When the two spheres are moved a bit further apart, the attractive force between them decreases a bit. In fact, the electrostatic force between two charged objects is given by

[tex]F=k\frac{q_1 q_2}{r^2}[/tex]

where

k is the Coulomb's constant

q1, q2 are the  charges on the two objects

r is the separation between the objects

As we can see, the force is inversely proportional to the square of the distance: therefore, if the separation between the spheres increases, the force will decrease.

Answer:

The acceleration is 0.

Explanation:

The formula for acceleration is:

a = (v-u)/t

If v and u are equal, thus it would be 0 when subtracted, and anything divided by 0 is 0.

Answer:

in men it is the Urethra.. it is not the same in woman but that is the most likely, I do not know of any of them being right but i may be wrong.

Explanation:

Answer:

1. Generator

2. Direct current  

Explanation:  

1.   The Generator is a device that uses energy of motion in a magnetic field to produce electric current.  It converts mechanical energy into electrical energy.  

2. The direct current or DC is the current in which charges flow in one direction. When there is continuous flow of electron tp the positive side from the negative side through a conducting material then the current is said to be  Direct current.

Answer:

They will push apart because they have the same charges

Answer:

No

Explanation:

I don't think the universe has a starting and ending point because the universe is vast and has not been fully discovered. I think that the universe is endless because all of the stars, planets, and galaxy's have yet to be found and the end or start of the universe is also yet to be discovered so I think that the universe could go on forever.

The universe's starting point is believed to be the Big Bang about 13.8 billion years ago, but whether it has an ending point is still unknown.

The question of whether the universe has a starting point and ending point is a topic explored in the field of physics. According to the Big Bang theory, the universe began with a singularity approximately 13.8 billion years ago. However, it is currently unknown whether the universe will have an ending point.

One theory suggests that the universe will continue expanding forever, gradually growing colder and darker. Another theory proposes the possibility of a Big Crunch, where the universe would eventually collapse in on itself. Some scientists also speculate about the possibility of a cyclical universe, where the cycle of expansion and contraction repeats indefinitely.

It's important to note that these theories are still being studied and researched, and our understanding of the universe's origins and potential ending is continually evolving.

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Answer:

Refraction

Explanation:

Refraction is a phenomenon typical of light waves. It occurs when a ray of light passes through the interface between two mediums: when doing so, the ray of light changes speed and also changes direction, according to Snell's Law:

[tex]n_1 sin \theta_1 = n_2 sin \theta_2[/tex]

where

[tex]n_1, n_2[/tex] are the index of refraction of the first and second medium, respectively

[tex]\theta_1, \theta_2[/tex] are the angle of incidence and refraction, respectively

When white light enters a prism, therefore, it undergoes refraction, and it changes direction.

However, the index of refraction of a material, n, depends also on the wavelength of the light. In particular, the shorter the wavelength, the higher the index of refraction.

This means that as white light enters a prism, the different wavelengths contained in the white light are refracted at different angles: as a result, the 7 colors of light will separate, and that is why we observe the rainbow when white light enters a prism.

Galileo's discovery shows that, to an observer on Earth, Venus has phases just like Earth's moon. This observation provide support for the heliocentric model of the solar system as follows:

Galileo's observation that Venus has phases supported the heliocentric model because this could only occur if Venus was orbiting the Sun, as predicted by the heliocentric model. The observation contradicted the geocentric model, which predicted that Venus would always appear in the same phase.

Galileo's observation that Venus has phases like the Moon was crucial in supporting a heliocentric model of the solar system. In the heliocentric model, the Earth and other planets revolve around the Sun. If this model was correct, Venus should show different phases as it moves around the Sun, similar to our Moon's phases as viewed from Earth. Conversely, in a geocentric model, where Earth is at the center of the universe, Venus would always be seen in the same phase, which was contrary to Galileo's observations. Therefore, Galileo's findings gave strong support to the heliocentric model, further solidifying the theory which is accepted as fact today.

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Final answer:

A car traveling at 120 km/h will have 9 times more kinetic energy than if it were traveling at 40 km/h, due to the kinetic energy being proportional to the velocity squared.

Explanation:

When a car is traveling 120 km/h, it will have 9 times more kinetic energy than if it were traveling at 40 km/h. This is because kinetic energy (KE) is proportional to the square of the velocity (v), as represented by the formula KE = 1/2 mv².

Given that the speed increases from 40 km/h to 120 km/h, which is a factor of 3 (120/40 = 3), and knowing the square relationship, we square this factor (3² = 9) to find that the kinetic energy increases by a factor of 9. Thus, a car traveling at 120 km/h has 9 times the kinetic energy of the same car traveling at 40 km/h, illustrating the substantial impact of speed on kinetic energy.

Answer:

A. 49

Explanation:

It is always nice to draw a free body diagram to visualize what is going on. (Or that is what my physics teacher told me haha)

Since you are given F=mg, you can substitute your given values (g=-9.8 and m=0.5) to solve for force.

F = -9.8 x 0.5 = -4.9 N

Then substitute -4.9 N and your given displacement (x=0.1) into your given equation to solve for the spring constant (k).

-4.9=-k(0.1) = -4.9/0.1 = -49

-49 = -k, so -49/-1 = 49

k=49

Answer:

nonpolar

Explanation:

Because no polar is a molecule like cholesterol

Non-polar solute is least likely to dissolve in water. So, the correct option is (C).

A polar solute is defined as one that dissolves only in a polar solvent such that water is a polar solvent and polar solute can readily dissolve in water while non polar solute is defined as a molecule whose constituents There is no net charge on the atoms where non-polar solvents such as organic solvents dissolve non-polar molecules, as in some organic compounds.

Polar solutes molecules are the molecules with polar bonds are usually asymmetrical while Non-polar molecules are the molecules with non- polar bonds which are usually symmetrical.

Thus, Non-polar solute is least likely to dissolve in water. So, the correct option is (C).

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Answer:

Y-X

Explanation:

Answer:

B

Explanation:

The location an electron can occupy around the nucleus depends on the electron's energy or the energy level in which it is present.

Electrons present in an atom revolve in different orbits which are stationary states and are also called as energy levels. The energy levels are numbered as integers which are also called as principal quantum numbers.

Energy of the stationary state is given as E= -R

1/n² where R

is the Rydberg's constant. When an electron is excited, and it moves from lower to higher energy levels there is absorption of energy, while when it moves from higher energy level to lower energy level it radiates or gives out energy in the form of radiation.

They can also be defined as the distances between electron and nucleus of an atom . Electrons present in K energy level have least energy .Energy level diagrams are studied to understand nature of bonding , placement of electrons in orbits and and elemental behavior under certain conditions.

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Final answer:

The location an electron can occupy around the nucleus depends on its energy. Electrons are described as occupying regions of space called orbitals, and these orbitals are determined by the electron's energy. The energy levels of the orbitals are primarily determined by the principal quantum number and the electrostatic potential produced by the nucleus and other electrons.

Explanation:

The location an electron can occupy around the nucleus depends on the electron's energy. In the current model of the atom, electrons are described as occupying regions of space called orbitals, which are determined by their energies. The energy levels of the orbitals are primarily determined by the principal quantum number and the electrostatic potential produced by the nucleus and other electrons.

Answer:

I have no clues what this means.....

Explanation:

I would be glad to help if you actually put a question.

Answer:

15 17 19 21 23 25 27 29 31 33 35 37 39 41

Explanation:

Answer:

A. seismic wave

Explanation:

Because a seismic wave is an elastic wave in the earth produced by an earthquake. And a electromagnetic wave is vibrations between an electric field and a magnetic field.

A student is studying a type of wave. Is it a light wave?, This question will help the student determine if it is an electromagnetic wave.

Visible light spectrum is nothing but the range of wavelength of radiation from 4000 angstrom to 7000 angstrom(Violet to Red). light is a energy packet. Every Photon having different wavelength travels with same velocity c (velocity of light). When we focus numbers of colors from visible spectrum to a point, that point appears as a white light. hence white light is composed of numbers of Colors in it.

When we pass white light through a prism, as white light enters in the prism all the colors having different wavelength travels with different velocity in the prism due to that there is separation of colors from the white light. Therefore we get different colors of white light in the prism this phenomenon is know as dispersion of light.

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Answer: Equal force

Explanation:

The total resistance of a series circuit is obtained by summing all the individual resistance of the cricuit.

The total resistance of a series circuit is obtained by summing all the individual resistance of the cricuit.

In series circuit, the current flowing in each circuit element is the same across the circuit.

V(t) = IR₁ + IR₂ + IR₃ + ----

V(t) = I(R₁ + R₂ + R₃)

Thus, the total resistance of a series circuit is obtained by summing all the individual resistance of the cricuit.

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Answer:

1500m/s

Explanation:

d=180000

t=120

units have to be converted into SI Units

Average Speed = (Total distance)/(Total Time)

Average Speed= (180000)/(120)

Answer:

Answer is C

Explanation:

Brainliest please I really need it

Answer:

c) 1600 J

Explanation:

Work = change in energy

W = ½ mv²

W = ½ (6.6 kg) (22 m/s)²

W = 1600 J

The work done to accelerate a 6.6 kg object from rest to 22 m/s is calculated using the work-energy principle and is approximately 1600 Joules.

The student is asking how much work is required to accelerate a 6.6 kg object from rest to 22 m/s. To solve this, we can use the work-energy principle, which states that the work done on an object is equal to the change in kinetic energy. The equation for kinetic energy (K) is K = (1/2)mv², where m is mass and v is velocity.

First, calculate the initial kinetic energy at rest, which would be zero, since the velocity is zero. Next, calculate the final kinetic energy using the formula with the given mass (6.6 kg) and final velocity (22 m/s).

K = (1/2)(6.6 kg)(22 m/s)² = (1/2)(6.6 kg)(484 m²/s²) = 1587.6 J. Therefore, the work done to accelerate the object is approximately 1600 J, matching option (c).

Answer:

Explanation:

Speed of light in a medium = speed of light in vacuum  / refractive index

= 3 x 10⁸ / 1.52

= 1.97 x 10⁸ m /s .

Final answer:

The speed of light in a material with an index of refraction of 1.52, calculated from the given formula v = c/n, is approximately 1.97 x 10⁸ m/s.

Explanation:

The question asks for the speed of light in a material given its index of refraction is 1.52, using the speed of light in a vacuum as 3.00 x 10⁸ m/s. The index of refraction (n) is defined by the equation n = c/v, where c is the speed of light in vacuum, and v is the speed of light in the material. Hence, to find the speed of light in the material, we rearrange the formula to v = c/n.

Given c = 3.00 x 10⁸ m/s and n = 1.52, we calculate:
v = 3.00 x 10⁸ m/s / 1.52 = 1.97 x 10⁸ m/s

Therefore, the speed of light in a material with an index of refraction of 1.52 is approximately 1.97 x 10⁸ m/s.