2 Polnts
What type of device forms images by changing the direction
but not the speed at which light travels?
O A. Any convex device
O B. Any lens
O C. Any concave device
O D. Any mirror
SUBMIT
​

Answer:

a resource

Explanation:

people and animals drink it and it keeps use from being dehydrated.

A solid, a liquid, and a gas.

Answer:

B. zero

Explanation:

The total mechanical energy of a spring is equal to the sum of its kinetic energy, K, and its potential energy, U:

[tex]E=K+U[/tex]

Where

[tex]K=\frac{1}{2}mv^2[/tex] is the kinetic energy, where m is the mass and v is the speed

[tex]U=\frac{1}{2}kx^2[/tex] is the potential energy, with k being the spring constant and x the displacement

The total mechanical energy is conserved during the entire motion of the spring. We have two particular situations:

- At the equilibrium position, the displacement is zero: x=0, so U=0 and the kinetic energy is maximum.

- At the position of maximum displacement (so the leftmost or rightmost position), the displacement is maximum, so U is maximum while the speed is zero (v=0), and therefore the kinetic energy is also zero: K = 0.

Therefore, the correct answer is

B. zero

Answer:

529.2 N

Explanation:

First of all, we need to convert the mass of the person into kg. We have:

1 pound = 0.45 kg

So

[tex]m=120 p \cdot 0.45 kg/p = 54 kg[/tex]

Now the force exerted by the ground on the man is equal to the weight of the man:

[tex]F=mg[/tex]

where

g = 9.8 m/s^2 is the acceleration due to gravity

Substituting

[tex]W=(54 kg)(9.8 m/s^2)=529.2 N[/tex]

Answer:

7.5 km/h (2.1 m/s) due east

Explanation:

The average velocity of the person is given by:

[tex]v=\frac{d}{t}[/tex]

where

d is the displacement

t is the time taken

In this problem,

d = 15 km is the displacement

t = 2.0 h is the time elapsed

so the average velocity is

[tex]v=\frac{15 km}{2.0 h}=7.5 km/h[/tex]

and the direction is the same as the displacement (east).

We can also convert the velocity into SI units (m/s). We have:

d = 15 km = 15,000 m

t = 2.0 h * 3600 s/h = 7200 s

[tex]v=\frac{15,000 m}{7200 s}=2.1 m/s[/tex]

Answer: the answer is 7200s

Explanation: i just now it

Please brainliest

Answer:

The phenomenon that describes the emission of electrons from a metal surface when light shines on it is the Photoelectric effect.

The phenomenon that describes the emission of electrons from a metal surface when light shines on it is the Photoelectric effect.

Explanation:

The term photo is used to define light and so photoelectric effect defines the phenomena when the light falls on the metal and the resultant effect of electrons on the surface of the conductor. Photoelectric effect also known as photoemission.

When the light is made to be incident on the surface of a conductor, electrons are discharged or released from the metal. Here the energy of the light acts as a work function so that it is used for the energy that is required to emit electrons.

Ke=34J. The canoe's kinetic energy floating downriver at a speed of 2m/s and 17kg mass is 34J.

This is a problem of kinetic energy, which is a form of energy, known as motion energy. The kinetic energy of an object is that which is produced because of its movements that depends on its mass and velocity.

The kinetic energy is represented by the following formula: Ke = ½ mv². The kinetic energy is measured in Joules (J), the mass in kilograms (kg) and the speed in meters over seconds (m/s).

A small 17kg canoe is floating downriver at a speed of 2m/s. Let's calculate canoe's kinetic energy.

Ke= (17kg)[(2m/s)²]/2= 68/2 kg m²/s²=34J

.

Answer:

C

Explanation:

Power is work divided by time:

P = W / t

Work is force times distance:

W = F d

Therefore:

P = F d / t

Given that F = 500 N, d = 60 m, and t = 240 s:

P = 500 N * 60 m / 240 s

P = 125 W

Answer is C.

You are the captain of a pirate ship and wish to find out how strong a new first mate is at rowing treasure from shore to the ship. It takes him 4 minutes (240 s) to row the treasure with a constant force of 500 N. The pirate supply 125 W of power.

A force is an effect that can alter an object's motion according to physics. An object with mass can change its velocity, or accelerate, as a result of a force. An obvious way to describe force is as a push or a pull. A force is a vector quantity since it has both magnitude and direction.

Power is work divided by time:

P = W / t

Work is force times distance:

W = F d

Therefore:

P = F d / t

Given that F = 500 N, d = 60 m, and t = 240 s:

P = 500 N * 60 m / 240 s

P = 125 W

You are the captain of a pirate ship and wish to find out how strong a new first mate is at rowing treasure from shore to the ship. It takes him 4 minutes (240 s) to row the treasure with a constant force of 500 N. The pirate supply 125 W of power.

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The propagation of light describes how light spreads out from a source and diminishes in intensity with distance, following the inverse square law. This concept is vital in fields like sample analysis and lithography. Understanding light propagation is essential for theoretical and practical physics and technology applications.

The propagation of light is an essential concept in physics with significant implications. When light travels from a source, such as a lightbulb, it expands in all directions, covering an ever-widening area. Because the total amount of light doesn't change, the amount of light in any given place decreases as the distance from the source increases, illustrating the inverse square law.

This weakening of light intensity has various practical applications:

Additionally, the wave-like nature of light is crucial in understanding interference and diffraction, as evidenced by the double-slit experiment. This experiment demonstrated that light behaves as a wave, creating observable interference patterns.

Overall, understanding how light propagates is vital for theoretical science and practical applications in technology and industry.

Answer:

D. Fulcrum

Explanation:

A wedge is a simple machine. A screw is a simple machine. A lever is a simple machine but fulcrum is the pivot point in a lever.

Answer:

A Hypothesis, and a control variable.

Explanation:

Matter: Toothpaste, Gasoline, Bacteria, Cell

Non-matter: Happiness, Sound.

Explanation:

The substances which occupies mass or volume occupying space is known as matter. It comprises of those things that can be seen through the eyes and it may include things like water, plants, food, dresses, etc. It can be defined by color or hardness.  

The substances that are made of energy without occupying space is known as non-matter substances. It can be classified as form of some energy. Some examples include light energy from torch, heat energy from fire and sound energy form whistle, etc.

Acceleration is a vector quantity because it has both magnitude and direction.

Acceleration is a vector quantity that describes how an object's velocity changes over time in both magnitude and direction. It has both magnitude and direction, making it a vector, and is measured in meters per second squared.

Acceleration is a vector quantity which means that it has both magnitude and direction. Acceleration provides information about how the motion of an object changes over time. It is always in the same direction as the change in velocity, which is also a vector. Since velocity can change in magnitude (speed) or direction, acceleration can be a change in speed, direction, or both. The SI unit for acceleration is meters per second squared (m/s²). An important aspect to note is that acceleration does not convey the actual velocity of the object; it only describes how the velocity is changing.

Answer:    desk, water, helium and clouds

Explanation:

Answer:

Desk

Water

Cloud

Helium

Explanation:

Edge 2023

Black soot decreases the albedo of snow, leading to increased absorption of solar radiation and faster snow melting due to positive feedbacks in climate dynamics.

An airplane sprinkles black soot on a snow-covered field. The soot will increase the rate that the snow melts because the darker-colored soot absorbs more solar radiation than the light-colored snow. Unlike snow, which has a high albedo and reflects most solar radiation, soot has a low albedo and thus absorbs more heat, leading to faster melting of the snow. This process is a part of positive feedbacks in climate dynamics, where an initial change is amplified by the effects it induces, such as increased absorption of solar energy leading to further melting.

Explanation:

G is the universal constant of gravitation, approximately 6.67×10⁻¹¹ m³/kg/s².

g is the acceleration due to gravity.  It's defined by the universal law of gravity as:

g = MG / r²

where M is the mass of the planet and r is the distance from the planet's center to the object.

Near the surface of the Earth, g is approximately 9.8 m/s².

All stars at birth begin to fuse hydrogen to form helium through nuclear fusion.

However, when the "fuel" of the star (hydrogen and helium) is exhausted, the star will become a red giant and begin to form other elements heavier than oxygen,  and then when the star is in the supernova phase, it will generate the rest of the heavy elements that exist in the periodic table, which are even heavier than iron.

Therefore:

All of the elements heavier than oxygen are created by fusion reactions in red supergiants and supernovas.

The mileage of the car how fast it is going

The speedometer in your car reads 55 mi/h. This represents the Instantaneous speed of the car.

Explanation:

Speed is a measurement of distance and time. Speedometers have been installed in vehicles to indicate the speed at which the driver drives the vehicles and control is also been used in few vehicles for the safety of the passengers like in school buses. When the car reads a reading in the speedometer, it denotes the instant speed of the car rather than the average speed.

Answer with explanations:

V=I1*R1=I2*R2 (when R1 and R2 are connected in parallel)

Therefore, rearranging above, I1/I2=R2/R1

Heat produced = I^2R

Ratio of heat produced by R1 and R2

= (I1^2*R1) / (I2^2*R2 )

= (I1/I2)^2 * (R1/R2)

= (R2/R1)^2 * (R1/R2)

= R2/R1

Answer:

Fossil fuel resources sometimes referred to as "buried sunshine"? Because they make the Earth warm because they are found deep in the Earth and the energy stored in them was obtained from the sun long ago because they produce energy the same way the sun does all of the above.

Explanation:

Answer:

Explained

Explanation:

All plants or producers which there food by sunlight with help of a process called photosynthesis. These plants are eaten by consumers that is animals and plant eaters are eaten by animal eaters. In this process the energy is transmitted. Although the primary source of energy is sun. These plants and animals when dead are buried under the earth to form fossil fuels. This why fossils are sometimes referred as " buried sunshine"  

Answer:

Reactants are initiators of a chemical reaction whereas products are substances produced as the end of that reaction.

Explanation:

In a chemical reaction, there are two categories of substances involved: reactants and products.

The reactants are those substances utilized in a chemical reaction which undergo certain changes to produce different substances at the end of the reaction known as products.

On can write a chemical equation as:

M+N→MN, where M and N are the reactants and MN is the product.

For example,

     Zn + S → ZnS

      |___|         ↓

Reactants      Products

As you can notice when writing a chemical equation, reactants are always written on left hand side of the arrow and the products on the right hand side.

A piece of blue paper appears blue because the paper absorbs all colors of light except blue. (b)

So any light that bounces off of the paper and enters your eye must be blue light !

A piece of blue paper appears blue because the paper b. absorbs all colors of light except blue

The absorption of light makes an object dark or opaque to the wavelengths or colors of the incoming wave

When an object receives light, it absorbs some wavelengths and reflects others. The ones it reflects are the ones we see as color hence , correct answer will be  b. absorbs all colors of light except blue

learn more about absorption of light

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Answer:Tectonic Plates

Explanation:The ocean floor is part of the Earth's crust, which is made up of tectonic plates that all collide with eachother and form mountain ranges. Sometimes these ranges and valleys are under the ocean.

Answer:Another name for heat energy is... Infrared waves. These cannot be seen by your eyes but can be felt by your skin. ... Gamma Rays. ... Which type of electromagnetic radiation can result in sunburns and skin cancer? Ultraviolet Radiation ... X Rays. What is the distance between one point of a wave to the same point in the ...

Answer:

INFRARED

Explanation:

I TOOK THE TEST

~ K12 STUDENT

8TH GRADE

GOOD LUCKK!! :)

The total amount of energy in a closed system must stay constant.

Answer:

The system's energy can not be created, or destroyed. It's transformable from one shape to another. The energy stays conserved in a closed system. It is isolated in the surrounding area.

Answer:

d

Explanation:

i took that test

In the area 1, 2, and 3 on the image does the salinity of the ocean increase. Option D is correct.

Seawater is salty due to a variety of substances. The majority of them arrive via rivers, which bring chemicals dissolved from rock and soil. The most common is sodium chloride, also known as salt.

Salinity makes water colder and denser by lowering its temperature. The chilly water sinks to the ocean's depths. Slow currents carry it throughout the marine basins.

So the events that may occur when ocean salinity increases will be;

1)The mass of water increases.

2) Freezing point of water decreases.

3) buoyancy of objects in the water increases.

In the area 1, 2, and 3 on the image does the salinity of the ocean increase.

Hence, option D is correct.

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Answer:

0.8 J

Explanation:

According to the law of conservation of energy, all the elastic potential energy stored in the spring is converted into kinetic energy of the dart:

[tex]U=K[/tex]

where we have

[tex]U=\frac{1}{2}kx^2[/tex] is the elastic potential energy of the spring, where k is the spring constant and x is the compression/stretching of the spring

[tex]K=\frac{1}{2}mv^2[/tex] is the kinetic energy of the dart, where m is the mass and v is the speed

The elastic potential energy of the spring is equal to the work done in compressing it, so

U = 0.8 J

and according to the law of conservation of energy, the kinetic energy gained by the dart is exactly equal to the potential energy stored in the spring:

K =  U =0.8 J

Time = (distance) / (speed)

Time = (65 meters) / (0.23 m /s)

Time = (65 / 0.23) sec

Time = 282.6 seconds   ( that's 4 minutes 42.6 seconds)

The time it would take a turtle moving with a speed of 0.23 m/s to cover a distance of 65 meters is approximately 282.61 seconds.

The subject of this question is physics, specifically the concept of speed, distance, and time. The formula that relates these three quantities is speed = distance/time.

In this case, we are asked to calculate the time it would take for a turtle moving with a constant speed to cover a certain distance. Here, the given speed (0.23 m/s) of the turtle and the distance it needs to cover (65 meters) are known.

By rearranging the formula to solve for time, we get time = distance / speed. Plugging in the values, we get time = 65 meters / 0.23 m/s. Doing the math gives approximately 282.61 seconds. Thus, it would take the turtle around 283 seconds to cover the distance of 65 meters at a speed of 0.23 m/s.

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Answer:

232 J

Explanation:

Energy is conserved.  All of the potential energy at the highest point of the swing is converted to kinetic energy at the lowest point.

Answer:

2.3 m

Explanation:

A simple pendulum has a period of:

T = 2π √(L/g)

If T = 3 seconds and g = 9.9 m/s², then L is:

3 = 2π √(L/9.9)

3/(2π) = √(L/9.9)

(3/(2π))² = L / 9.9

L = 9.9 (3/(2π))²

L ≈ 2.3 m

To calculate the length of the pendulum, use the formula T = 2π√(L/g). Rearrange the formula, plug in the given values for T and g, and solve for L.

To calculate the length of the pendulum, we can use the formula for the period of a simple pendulum which is T = 2π√(L/g). In this case, we are given that T = 3 sec and g = 9.9 m/s². Plugging in these values, we can rearrange the formula to solve for L:

T = 2π√(L/g)

3 = 2π√(L/9.9)

Squaring both sides of the equation, we get:

9 = 4π²(L/9.9)

Dividing both sides of the equation by 4π² and multiplying by 9.9, we get:

L = (9.9 * 9) / (4π²)

Calculating this expression, we find that the length of the simple pendulum is approximately 0.250 m.

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