Physics High School

When you look into a clear pond, a fish may appear to be in a different position than it actually is. What is this caused by?

A. diffraction

B. dispersion

C. refraction

D. reflection,

Answers

Answer 1
Refraction Refraction is when waves are deflected when passing obliquely through the interface between one medium and another or through a medium of varying density. (the pond water)

Related Questions

Because speed is squared in the kinetic energy equation doubling an object's speed will what to its kinetic energy

Answers

doubling the speed, increases the K.E by a factor of 4!

The two balls are an "action-reaction" pair. Ball 2 had a reaction to the action of ball 1, but ball 1 also had a reaction to ball 2. Explain how each ball moved after the collision in terms of the forces the balls exerted on each other.

Answers

Newton’s first law I guess

A vector has an x-component of length 10 and a y-component of length 3. What is the angle of the vector? (Hint: Use the inverse tangent.)

Answers

The vector, the x-component and the y-component form a rectangle triangle where the vector is the hypothenuse and the x and y components are the two sides.
Calling [tex]\alpha [/tex] the angle between the vector and the horizontal direction (x), the two sides are related to [tex]\alpha [/tex] by
[tex]\tan \alpha = \frac{v_y}{v_x} [/tex]
where vy and vx are the two components on the y- and x-axis. Using vx=10 and vy=3 we find
[tex]\tan \alpha = \frac{3}{10} =0.3[/tex]
And so the angle is
[tex]\alpha = \arctan (0.3)=16.7^{\circ}[/tex]

Match the description of how heat is transferred to the proper term. A. When two things in contact with each other transfer heat Convection B. When a liquid or gas carries heat Conduction C. When waves transfer heat Radiation

Answers

When two things in contact with each other transfer heat - Conduction
When a liquid or has carries heat- Convection
When waves transfer heat- Radiation

 these are my answers from the quiz i took

The final phase of the order cycle is called order ____.

Answers

The final phase of the order cycle is called order delivery. 

Suppose you were asked to demonstrate electromagnetic induction. Which of the following situations will result in an electric current?
A magnet is moving toward a wire loop.
A wire loop is moving away from a magnet.
A wire loop is rotated near a magnet.
All of the above

Answers

The correct answer is "All of the above".

In fact, electromagnetic induction occurs when there is a change of the magnetic flux through the area enclosed by a circuit (in this case, the area enclosed by the wire loop).
The magnetic flux [tex]\Phi_B[/tex] through a certain surface is given by
[tex]\Phi_B=B A cos \theta[/tex] (1)
Where B is the intensity of the magnetic field, A is the area enclosed by the circuit and [tex]\theta[/tex] is the angle between the direction of the field B and the perpendicular to the area.

In the first situation, the magnet is getting closer to the loop, so the magnetic flux through the area enclosed by the wire is increasing (because the intensity of the magnetic field B is increasing). Situation 2) is the opposite case: the wire loop is moving away from the magnet, so the intensity of the magnetic field B is decreasing, and therefore the magnetic flux is decreasing as well.
Finally, in the third situation the wire loop is rotating. Here the distance between the loop and the magnet is not changing, but remember that the magnetic flux depends also on the angle between the direction of the magnetic field and the perpendicular (formula 1), and so since the wire loop is rotating, than this angle is changing, therefore the magnetic flux is changing as well.

A strong magnetic field surrounds earth. How does earths magnetic feild help humans?

Answers

Answer:

Earth's magnetic field deviates high energy particles (e.g cosmic rays) that are a risk for human health.

Explanation:

Cosmic rays are high energy charged particles (88% protons, 10% nuclei of helium, 1% heavier nuclei) that came from the outer space. The energies of these particles are in the range of 1 GeV to 10⁸ TeV. Since they are charged particles, they will be deviated by Earth’s magnetic field¹ (as a reminder: A magnetic field applies a magnetic force over a moving charged particle).

Earth’s magnetic field works as a shield to humans against high energy charged particles, if cosmic rays were in touch with a human body, it can break molecules that forms DNA structure². Modifying that structure can lead to diseases as cancer, for example.

Units:

GeV: Giga-electronvolt

TeV: Tera-electronvolt

¹Magnetic field: It is generated around the space of a moving charged particle.

²DNA structure: It is a compound of different molecules that provides information to cells functionality.

what mechanical layer lies below the lithosphere

Answers

Answer: The layer below the lithosphere lies the Asthenosphere.

Explanation:

The asthenosphere is a viscous layer, in which the rocks are solid but has the ability to slightly flow due to deformation. This layer plays a very significant role in the plate tectonic movement, which initiates the motion of the lithospheric crust, due to the generation of the convection current at the mantle. It is present in the upper part of the mantle.

The internal heat from the core of the earth radiates to the mantle, and the magma at the mantle gets heated up and become less dense and rises up, and this magma when reaches on the upper part of the mantle, near the surface, gets cools down and become more dense, and sinks. This continuous circulation of magma in the mantle region is known as the convection current.

Final answer:

The layer below the lithosphere is the asthenosphere, which is semi-fluid and allows the tectonic plates of the lithosphere to move.

Explanation:

The mechanical layer that lies below the lithosphere is known as the asthenosphere. This semi-fluid layer is located directly underneath the rigid lithospheric plate and is characterized by its ability to flow and move. Due to intense heat and pressure coming from the earth's core, the rocks in the asthenosphere exist in a plasticky, semi-liquid state, which allows the tectonic plates of the lithosphere to move and shift above it.

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Help please

Water is a compound because it (1 point)
• can be broken down into simpler substances.
• always has two hydrogen atoms for each oxygen atom.
• is made of water atoms joined together.
• both a and b



Which of the following is a heterogeneous mixture? (1 point)
• water in a swimming pool
• sugar water
• a jar of mixed nuts
• stainless steel,

Answers

Water is a compound because: It can be broken down into simpler substances Chemical compound: a substance formed from two or more elements chemically united in fixed proportions. A jar of mixed nuts is a heterogeneous mixture. A heterogeneous mixture is a mixture that is not uniform in composition – it's a non-uniform mixture of smaller constituent parts.

English help please
The last answer says archer

Answers

it's the letter A it demonstrates...
it is the first answer
hope this helps!!!

Match the term to its definition. A. Conduction Heat flowing when a liquid or gas carries the heat B. Convection Heat flowing between two objects that are touching each other C. Radiation Heat flowing in waves

Answers

A. Conduction --> Heat flowing between two objects that are touching each other
B. Convection --> Heat flowing when a liquid or gas carries the heat
C. Radiation --> Heat flowing in waves

the combination of all forces acting on an object is called _____.

Answers

The answer is net force akaskakska

Although Neptune is the farthest planet from the Sun, it travels in a fixed orbit around the Sun and never changes its path. What is the reason for this?
A) The magnetic pull of the Sun holds Neptune in its orbit.
B) The gravitational pull of the Sun holds Neptune in its orbit.
C) The nuclear force acting between the Sun and Neptune holds the latter in its orbit.
D) The repulsive force of bodies outside the solar system holds Neptune in its orbit.

Answers

Answer:

B. The gravitational pull of the sun holds Neptune in its orbit.

Explanation:

Whether a farthest planet or a nearest planet, all the planets in the  solar system are held in their respective orbits by the mutual gravitational force of attraction. That is, the Sun exerts a gravitational force on the planet and the planet in turn pulls the Sun towards it. These two forces are equal in magnitude and oppositely directed to each other.

That is very well explained by the Newton's universal gravitational law,

As the distance between the Sun and the planet increases, the mutual gravitational force of attraction between the planets will decrease.

Mercury, Venus, Earth , Mars, Jupiter, Saturn, Neptune and Uranus are the planets that belong to the solar system. All these planets are revolving around the Sun.

Answer:

B

Explanation:

At noon, ship a is 30 nautical miles due west of ship
b. ship a is sailing west at 22 knots and ship b is sailing north at 23 knots. how fast (in knots) is the distance between the ships changing at 5 pm? (note: 1 knot is a speed of 1 nautical mile per hour.)

Answers

We need to find relative speed between two ships. 
We look at relative speed along the north direction and west direction.
[tex]N: v_b_n-v_a_n=v_b_n\\ W:v_a_w-v_b_w=v_a_w\\[/tex]
This is because boats are travaling at directions that are perpedincular to each other. Total relative speed is:
[tex]v_r=\sqrt{v_a_w^2+v_b_n^2}=\sqrt{22^2+23^2}=31.83[/tex]
And that is how fast they are moving away from eachother.  
Please note that these boats are not accelerating, therefore the distance between them is increasing at the constant rate.

An experiment is designed to test the relationship between the initial height of a basketball before it is dropped to the height of its rebound bounce. The height of the rebound bounce is measured using a scale positioned behind the ball.

In the above experiment, which condition would not be controlled?

Answers

In general, when designing the experiment, it is desirable to control all thing that can affect the outcome of the experiment. In practice, this is not easily obtainable.
I imagine it would be hard to control the temperature in this experiment. Even though, temperature does affect the ball's bounce. 
Keep in mind that even if you don't control something it still can be measured and then you can use that information to correct your predictions.
In general, when coming up with the experiment, it's fascinating to control all factor which will have an effect on the end result of the experiment. To observe, this is often not simply gettable.
I imagine it'd be hard to manage the temperature during this experiment. although, the temperature will have an effect on the ball's bounce. 
Keep in mind that even if you do not management one thing it still is often measured then you'll be able to use that information to correct your predictions.
Explanation:

Now an uncontrolled variable is something like a force of nature, size of one thing or it's physically that cannot be controlled or modified.

An uncontrolled variable, or intermediator variable, is that the variable in an associate experiment that has the potential to negatively impact the link between the independent and dependent variables.

The temperature differences seen between quito, ecuador, and guayaquil, ecuador, illustrate the effect of _____. ocean currents cloud cover altitude

Answers

The answer would be altitude. 
Quito has the altitude of  2.850m, while Guayaquil has the altitude of 5m.
This can lead to the vast difference in climates.
The most noticeable difference is that temperature drop with increased altitude.
For each 1,000 foot rise in altitude, there is a 4°F drop in temperature.

This one has got to be the altitude.

How much heat is needed to change 5.42 grams of solid gold to liquid gold at its melting point of 1,063°C? The latent heat of fusion of gold is 66.6 J/g.

Answers


[tex]5.42 \times 66.6 = 360.972[/tex]
360.972 J

Answer:

360.97 J

Explanation:

mass of gold, m = 5.42 g

Latent heat of fusion, L = 66.6 J/g

The amount of heat required to convert 1 kg of solid into liquid state at its melting point is called latent heat.

L = Heat / mass

So, L = Q / m

Q = m L

Where, Q is the amount of heat supplied and L be latent heat of fusion amd m be the mass of substance.

Q = 5.42 x 66.6

Q = 360.97 J

Thus, the amount of heat required to melt the desired amount of gold is 360.97 J.

Select all that apply. A hypothesis is _____. always correct determined before experimentation begins the experimental factor that changes in response to a change in the independent variable testable and falsifiable

Answers

Final answer:

A hypothesis is a testable and falsifiable assumption known before experimentation. It's not always correct and does not always change in response to a change in the independent variable. Even when experiments support a hypothesis, it is not confirmed as absolutely correct.

Explanation:

A hypothesis is a testable and falsifiable assumption based on what is known. It is determined before any experiment begins and serves as a guide for the collection and analysis of data. For instance, we could formulate a hypothesis like, 'If I water plants with sugar-mixed water, they will grow faster.'. If subsequent experimentation disproves this hypothesis, it must be discarded or reformed.

A hypothesis does not necessarily change in response to a change in the independent variable; rather, it predicts the expected response or outcome. However, a hypothesis is not always correct. It represents our best prediction based on the current information and can often be proven wrong as new data or insights become available via further empirical research.

Furthermore, in scientific research, even though a hypothesis is supported by multiple experiments, it does not confirm it to be correct, as future experiments could contradict it. Also, if a hypothesis explains a large amount of experimental data it could be considered a theory, but even theories can be modified if new data appears.

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Compare and contrast the movement of electric charge in a solution with the transfer of electric charge between solid objects.

Answers

In a solution, the movement of electric charge is given by the movement of ions (positive or negative), which are the result of dissociation of molecules of the solution.
In solid objects, instead, the movement of electric charge is given by the movement of valence electrons or by holes, created when a valence electron leaves a vacancy in the outer shell of an atom.

Electric charge transfer between solid objects involves the movement of electrons, whereas in solutions it involves the movement of both cations and anions. Both processes follow the principle of charge conservation.

Understanding the movement of electric charge requires comparing how it occurs in solutions versus solid objects. In solid objects, charge transfer primarily happens through the movement of electrons. When two solid objects come into contact, electrons can be transferred from one object to another, often facilitated by friction, leading to one object becoming negatively charged and the other positively charged.

On the other hand, in a solution, electric charge is carried by ions. For instance, in an ionic solution like salt water, both positive ions (cations) and negative ions (anions) can move freely. This is different from the transfer between solid objects where only electrons, carrying negative charges, move.

The relationship between the total charges before and after the transfer is that the total amount of charge is conserved. This means the sum of positive and negative charges remains constant, even though the charges might be redistributed. This principle is crucial in both solid object charge transfer and ionic solutions.

So, while the transfer of electric charge between solid objects involves moving electrons, in a solution, it involves the movement of both cations and anions. Both processes abide by the principle of charge conservation, ensuring that the total charge remains constant.

If the diameter of the black marble is 3.0 cm, and by using the formula for volume, what is a good approximation of its volume? Record to the ones place.
______cm3
Determine the initial volume of water in the graduated cylinder. If you added the black marble to the graduated cylinder and it sinks, what final volume should the water level indicate? Record to the ones place.
______ML

Answers

Answer:

The answers are 14 and 124, respectively.

Explanation:

The proof for these answers is the image attached.

Answer:

it is 14 and 124 I have took the test.

Explanation:

How was the speed of light measured in a precise way?

A. by timing how long it takes for an assistant far away to turn on a lantern after the scientist turns one on

B. by watching for eclipses

C. by timing the speed of falling meteorites

D. by using rotating mirrors to measure light's round trip travel to a distant mountain

:O :/,

Answers

The first successful measurement of the speed of light was done so through the observation of eclipses. Olaus Roemer noticed that depending on the relationship between the Earth, Sun and Jupiter there were varying differences in the times of predicted eclipses.

Record the length of the line shown in millimeters.

Choose one will mark the Brainliest.

34.3

3.43

3.40

3.4

Answers

Boss, your ruler is in centimeters which means it’s roughly 34 mm
This line is measured on a cm scale and we need to convert to mm.  To do that multiply the cm by 10.
When I look at the line the length is approximately 3.4 cm multiply that by 10 to get roughly 34 mm which matches with a

Which of the following items is most sensitive to increased acidity in the environment?

Answers

concrete buildings. i hope this helps you 

Answer: CONCRETE BUILDINGS

Explanation:

i got it right in my quiz

Make the following conversion.

45 m = ____ cm

4500
0.45
450
0.045

Answers

1 m = 100 cm so...

[tex]45 m * \frac{100 cm}{1 m} = 4500 cm[/tex]
It is 4500 cm. 

I m equal to 100 cm and 45 m is 4500 cm

The potential difference in a simple circuit is 9 v and the resistance is 47 ω . what current flows in the circuit? answer in units of
a.

Answers

The current flowing in the circuit with a potential difference of 9 volts and resistance of 47 ohms is approximately 0.1915 amperes (A), calculated using Ohm's Law (I = V/R).

The current that flows through a circuit can be calculated using Ohm's Law, which is given by the formula V = IR, where V is the potential difference, I is the current, and R is the resistance. In this case, the potential difference is 9 volts (V) and the resistance is 47 ohms (Ω). To find the current, we rearrange the formula to I = V/R.

Substitute the given values into the formula:

I = 9V / 47Ω

I ≈ 0.1915 A

So the current flowing in the circuit is approximately 0.1915 amperes (A).

A soccer ball is kicked with an initial speed of 8.8 m/s. After 0.179 s it is at its highest point. What was its initial direction of motion?,

Answers

To solve the problem we can consider only the motion on the vertical direction (y-axis). Let's the take upward as positive direction, such that the acceleration of the motion (the gravitational acceleration) is negative: [tex]g=-9.81 m/s^2[/tex], because it is against the direction of the motion.
The initial speed of the ball on the y-axis is [tex]v_0 \sin \alpha[/tex], where [tex]v_0 = 8.8 m/s[/tex] and where [tex]\alpha [/tex] is the angle of the initial velocity v0 with respect to the horizontal, so it's the direction that we want to find.

The law of the velocity on the y-axis is:
[tex]v(t)=v_0 \sin \alpha + gt[/tex]
Where t is the time. At its highest point, the vertical velocity of the ball is zero, and this occurs when t=0.179 s: [tex]v(0.179 s)=0[/tex]. So we can write:
[tex]v(0.179 s)=v_0 \sin \alpha + gt=0[/tex]
And substituting the numbers we can find the value of the angle:
[tex]\sin \alpha = \frac{-gt}{v_0}= \frac{-(-9.81 m/s^2)(0.179 s)}{8.8 m/s}=0.20 [/tex]
[tex]\alpha = \arcsin (0.20)=11.5 ^{\circ}[/tex]

A balloon filled with helium occupies 20.0 l at 1.50 atm and 25.0◦
c. how many moles of helium will there be in the balloon at stp?

Answers

Final answer:

By applying the Ideal Gas Law, we find that the helium balloon contains approximately 1.22 moles under the given conditions. This mole amount remains consistent at standard temperature and pressure (STP) as no gas is added or removed.

Explanation:

Your question pertains to the concepts of chemical stoichiometry and the gas laws. Given the conditions and the volume of the gas, we start by converting the initial conditions to Standard Temperature and Pressure (STP). Your balloon containing helium is at a volume of 20.0 L, a pressure of 1.50 atm, and a temperature of 25.0°C (or 298.15 K in absolute temperature).

The Ideal Gas Law (PV=nRT) allows us to calculate the number of moles (n) in the balloon initially: n = PV/RT = (1.50 atm * 20.0 L) / (0.0821 L*atm/mol*K * 298.15 K) which results in approximately 1.22 mol of helium.

Now, to find the number of moles at STP, we need to remember that the number of moles remains the same as long as no gas is added or removed. Therefore, your balloon contains approximately 1.22 moles of helium at STP as well.

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There are approximately [tex]1.225\ moles[/tex] of helium in the balloon at STP (Standard Temperature and Pressure).

To find out how many moles of helium are in the balloon at STP (Standard Temperature and Pressure), we'll follow these steps:

Given Data

Volume of the balloon, [tex]\( V = 20.0 \) L[/tex]

Pressure of the helium gas,[tex]\( P = 1.50 \) atm[/tex]

Temperature of the helium gas, [tex]\( T = 25.0 \) ^\circ C[/tex]

Convert Temperature to Kelvin

First, convert the temperature from Celsius to Kelvin:

[tex]\[ T_{\text{Kelvin}} = T_{\text{Celsius}} + 273.15 \][/tex]

[tex]\[ T_{\text{Kelvin}} = 25.0^\circ C} + 273.15 \][/tex]

[tex]\[ T_{\text{Kelvin}} = 298.15 \text{ K} \][/tex]

Calculate the Number of Moles (using the Ideal Gas Law)

The ideal gas law equation relates the pressure, volume, temperature, and number of moles [tex](\( n \))[/tex] of a gas:

[tex]\[ PV = nRT \][/tex]

where:

[tex]\( P \)[/tex] is the pressure in atmospheres (atm)

[tex]\( V \)[/tex] is the volume in liters ([tex]L[/tex])

[tex]\( n \)[/tex] is the number of moles of gas

[tex]\( R \)[/tex] is the ideal gas constant, [tex]\( R = 0.0821 \) L\ atm/mol\ K[/tex]

[tex]\( T \)[/tex] is the temperature in Kelvin ([tex]K[/tex])

First, calculate [tex]\( n \)[/tex] using the ideal gas law:

[tex]\[ n = \frac{PV}{RT} \][/tex]

Now, substitute the given values:

[tex]\[ n = \frac{(1.50 \text{ atm}) \times (20.0 \text{ L})}{(0.0821 \text{ L·atm/mol·K}) \times (298.15 \text{ K})} \][/tex]

[tex]\[ n = \frac{30.0 \text{ atm·L}}{24.485 \text{ L·atm/mol}} \][/tex]

[tex]\[ n = 1.225 \text{ mol} \][/tex]

Which are ways of showing probability? Check all that apply.

Answers

i would say

-50%

-3/4

-25%

-7/8

Answer: a c e f

Explanation:

How does the mass relate to the momentum ?

Answers

Hi there!

Mass relates to momentum because
the heavier the object is, the more energy ît takes to make it start moving and make it stop. For example, if I had a 20 pound object and a 50 pound object, the 50 pound object would travel less than the 20 pound object when the same amount of force is exerted on it.

Hope this helps!

The input force of a pulley system must move 8.0 m to lift a 3,000-n engine a distance of 2.0 m. what is the ima of the system?

Answers

The IMA (ideal mechanical advantage) of a single pulley is the ratio between the output force and the input force:
[tex]IMA= \frac{F_{out}}{F_{in}} [/tex]
Moreover, for the law of conservation of energy, the work done in input to lift the lift must be equal to the output work:
[tex]W_{in}=W_{out}[/tex]
[tex]F_{in} d_{in}=F_{out} d_{out}[/tex]
where the [tex]d_{in}[/tex] is the distance for which the input force is applied while [tex]d_{out}[/tex] is the distance of which the lift is lifted.
Substituting [tex]F_{out}=3000 N[/tex], [tex]d_{out}=2 m[/tex] and [tex]d_{in}=8 m[/tex] into the previous equation, we find the value of the input force:
[tex]F_{in}= \frac{F_{out} d_{out}}{d_{in}} = \frac{(3000 N)(2 m)}{8 m}=750 N [/tex]
And now we can find the IMA of the pulley:
[tex]IMA= \frac{F_{out}}{F_{in}}= \frac{3000 N}{750 N}=4 [/tex]

As we can see, the IMA is also equal to the ratio between the input and output distance:
[tex]IMA= \frac{d_{in}}{F_{out}}= \frac{8m}{2m}=4 [/tex]
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