What must be true about tow objects if heat is flowing between them?

The answer here is true

Final answer:

Refraction is the bending of light waves as they pass from one medium to another and involves a change in speed and direction, not amplitude. The statement provided is false.

Explanation:

The statement provided by the student is false. Refraction is the bending of light waves, which occurs when a light wave passes from one medium to another, such as air to glass. The key aspect of refraction is the change in direction of the wave due to a change in its speed as it moves between media with different densities. However, refraction does not involve a change in the amplitude of the wave, but rather a change in the wave's speed, and, consequently, its wavelength. Moreover, the frequency of the wave remains constant during this process.

Answer:

When we talk about closed economy, it means that the economy is self-sufficient. At a closed economy, no imports from the outside are brought inside a nation and no exports are sent out as well

Explanation:

Answer:

An example of a close economy is Brazil.

Explanation:

A closed economy is an economy that does not interact with other economies. One example is Brazil.

Answer:

C 35 km , is the answer

Explanation:

d=55 - 20 = 35

Answer:64l.biggs on ig

Explanation:

Answer:

what are the statements

Explanation:

Answer:

Almost all the mass and all the positive charge of the atom is concentrated in a very small region called the nucleus and the negative charge was distributed throughout the rest of the atom

Explanation:

Rutherford's experiment was to bombard a gold foil with alpha particles, finding that most of the particles change their direction very little, some change it a lot and very few almost recede; With these measurements he came to the conclusion that almost the entire mass of the atom had to be in a very small space that I call a nucleus, in addition as the alpha particles have two positive charges so that there is a force of repulsion the charge of the nucleus must also be positive; with this I enunciate an atomic model:

 Almost all the mass and all the positive charge of the atom is concentrated in a very small region called the nucleus and the negative charge was distributed throughout the rest of the atom

The buoyancy force acting on the cube will be  3.65 N and the buoyancy force would be greater if the gold cube were suspended in water.

A fluid exerts an upward force against the weight of a partly or completely submerged item.

The weight is acting downward if the weight of a cube of gold in the air is considered then the equation ios found as;

F = W+w

Where,

F is the buoyancy force

W is the weight of a cube in water

w is the weight of the cube in the air

The buoyancy force is found as;

F = W+w

F= 1.89 +1.76

F= 3.65 N

The formula for the buoyancy force is;

F=ρgV

If the density is greater the buoyancy force is greater the density of the water is greater than the air for the same condition the buoyancy force would be greater if the gold cube were suspended in water.

Hence, the buoyancy force acting on the cube will be 3.65 N and the buoyancy force would be greater if the gold cube were suspended in water.

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The buoyancy force acting on the gold cube is 0.13 N, calculated by subtracting its weight in molasses from its weight in air. According to Archimedes' principle, the buoyancy force is due to the weight of the fluid displaced, which means it would be smaller in water than in molasses due to water's lower density.

Buoyancy force acting on a gold cube and understanding how the buoyancy force would change if the cube were suspended in water instead of molasses. When the gold cube is suspended in air, it weighs 1.89 N, and when suspended in molasses, it appears to weigh 1.76 N.

To find the buoyancy force, we subtract the apparent weight in molasses from the weight in air: 1.89 N - 1.76 N = 0.13 N. Therefore, the buoyancy force acting on the cube is 0.13 N.

Archimedes' principle states that the buoyant force on an object is equal to the weight of the fluid it displaces. Since gold is denser than most fluids, it displaces a small amount of fluid, leading to a relatively small buoyancy force.

However, if the cube were suspended in water, the buoyancy force would likely be smaller than in molasses because molasses is denser than water, and thus, the cube would displace more water by volume, but water's lower density means the displaced water would weigh less, resulting in a smaller buoyancy force.

Kinetic Energy = 1/2mv^2

m = mass

v = velocity

Mass is given as 600kg

Velocity is given as 10 m/s

Kinetic energy = 1/2 * 600 * 10^2

Kinetic energy = 3000 J

Answer:

30,000 J

Explanation:

Answer:

the average kinetic energy of water particles - C.

The wires is what is needed to put together the whole thing, kinda like glue when you're gluing a piece of paper on it.

Anyways, the battery is the main source and main energy per say.

That energy that comes from the battery, thanks to the wires, it can transfer that said energy to both the switch and light bulb.

And as you flick the switch, it depends of how you put it together, there's two options, turning the light bulb on or turning it off.

Though it doesn't mean that since the light bulb is connected to the battery makes the bulb turn on no matter what since the switch can cancel the main source's energy.

- Ouma :>

Answer: Firearm identification is the process of analyzing the bullets and cartridge cases left at a crime scene to determine if they came from a particular firearm. Marks on the bullets and cartridges may be common to every firearm of that type (for example, the caliber of the firearm). These are called class characteristics.

Explanation: i go to flvs to what teacher

First you must calculate the speed of Amy and speed of Bill.

[tex]

d=14.4km=14400m \\

t_a=40min=2400sec \\

t_b=20min=1200sec \\

s_a=\frac{d}{t_a}=\frac{14400m}{2400sec}=\boxed{6\frac{m}{sec}} \\

s_b=\frac{d}{t_b}=\frac{14400m}{1200sec}=\boxed{12\frac{m}{sec}} \\

[/tex]

Now calculate the difference between Bill's speed and Amy's speed.

[tex]

\Delta{s}=s_b-s_a=12\frac{m}{sec}-6\frac{m}{sec}=\boxed{6\frac{m}{sec}}

[/tex]

Amy's average speed is not faster. Bill's average speed is faster than Amy's by 6 m/sec.

Hope this helps.

r3t40

Answer:

Darwin's theory of natural selection lacked an adequate account of ... Darwinian principles now play a greater role in biology than ever before, .... Sadly, even if Mendel had lived to see the rediscovery of his work, he probably .... evolutionary forces are acting, a genetic equivalent to Galileo's law of inertia.

Explanation:

Answer:

A. Mendel’s genetics states laws that are now part of the theory of biological evolution.

Explanation:

edge 2021 :)

The flatter concave lens becomes the  emergent ray moves towards being parallel two incident rays.

Explanation-

A concave lens is a lens that diverges the rays, passing through the lens, from its path thereby appearing to come from a point where image is formed these types of lenses are used by people who find trouble in seeing things that are at a distance. The flatter the lens become it moves more towards becoming a glass slab which refracts the light  such that the emergent ray is parallel two incident Ray but only from another point.  

As a concave lens becomes flatter and more like a flat piece of glass, its focal length increases. This reduces its capability to bend light rays, diminishing its effect on the image until the lens no longer forms a distinct image and the virtual image is the same size as the object.

As a concave lens becomes flatter, approaching the shape of a flat piece of glass, its focal length increases until it theoretically becomes infinite. A lens with an infinite focal length means there is no specific point at which it focuses light rays, effectively not forming a distinct image. This can be understood using ray tracing methods, where a ray that enters parallel to the axis appears to come from the focal point, and a ray passing through the center of the lens continues straight. In the case of an infinitely flat lens, these rays would continue in a straight path, mimicking what happens with a flat piece of glass. The virtual image produced by a concave lens is always smaller than the object and remains the same when the lens becomes flatter, but the minification effect weakens gradually. Eventually, when the lens is completely flat, it neither diverges nor converges light, so the size of the virtual image is essentially the same as the object.

Answer:

The Rabbit!

Explanation:

Because primary consumers (the rabbit) consume producers (the grass).

In the given food chain Rabbit is the primary consumer.

Explanation:

Primary consumers are herbivore which will consume plants that produce their food using photosynthesis. A primary consumer feeds on primary producers. The food chain is the consumption chain from producer through level of consumers.

Some of the examples of primary consumers are as follows,

Answer:

the correct answer is a)

Explanation:

The changes from wave A to wave B can be explained by the difference in their characteristics. Line A is a decreasing line, and line B is an increasing line, with line A being much steeper than line B.

The changes from wave A to wave B can be explained by the difference in their characteristics. Line A is a decreasing line, indicating a decrease in amplitude or intensity, while line B is an increasing line, indicating an increase in amplitude or intensity. The steepness of line A is greater than that of line B. This change in amplitude and steepness represents the change from wave A to wave B.

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Answer:

x=10, y=5

Explanation:

-4x + 11y = 15

x = 2y

Use substitution:

-4(2y) + 11y = 15

-8y + 11y = 15

3y = 15

y = 5

Now find x:

x = 2y

x = 2(5)

x = 10

Answer:

[tex]4.74\cdot 10^{14}Hz[/tex]

Explanation:

The frequency of an electromagnetic wave is given by

[tex]f=\frac{c}{\lambda}[/tex]

where

[tex]c=3.0\cdot 10^8 m/s[/tex] is the speed of light

[tex]\lambda[/tex] is the wavelength

For the light wave in this problem, the wavelength is

[tex]\lambda=6.33\cdot 10^{-7}m[/tex]

So by using the equation above, we find its frequency:

[tex]f=\frac{3\cdot 10^8 m/s}{6.33\cdot 10^{-7} m}=4.74\cdot 10^{14}Hz[/tex]

The frequency of light can be found by using the formula f = c ÷ λ, where c is the speed of light and λ is the wavelength. By substituting these values into the formula, you can calculate the frequency of light with a given wavelength.

When you are given the wavelength of light and asked to find its frequency, you would use the formula c = fλ, where c is the speed of light (3.00 x 10⁸ m/s in vacuum), f is the frequency, and λ is the wavelength. To find the frequency, we rearrange this formula to get f = c ÷ λ. Given the wavelength λ = 6.33 x 10^-7 m, we can substitute these values into the rearranged formula to find the frequency:

f = (3.00 x 10⁸ m/s)  ÷  (6.33 x 10^-7 m)

By calculating the above equation, you will find the frequency of the light with the given wavelength.

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Answer: The reflected ray will be 44 degrees.

Explanation: The Law of Reflection states the angle of incidence ( the incoming light ray) equals the angle of reflection ( the light ray being reflected) Therefore, the angle of reflection will be 44 degrees.

Hope that helped!

Answer:

Liquids are more dense than gases, but less dense than solids, so sound travels 2nd fast in liquids. Gases are the slowest because they are the least dense: the molecules in gases are very far apart, compared with solids and liquids.

Explanation:

Answer:

Longitudinal waves travels faster through solids than it does through gases

Explanation:

As we know that longitudinal waves travels through all types of mediums and the speed of longitudinal waves is given as

[tex]v = \sqrt{\frac{E}{\rho}}[/tex]

here we know that

E = elasticity of the medium

[tex]\rho[/tex] = density of the medium

now here we know that elasticity of solids is much more than the elasticity of gases

So the speed of longitudinal waves in solids is more than the speed of waves in gases

Answer:

The Force Of Friction

On a flat surface, the coefficient of friction is the ratio between the force of friction and the weight of the object. Hence, the correct answer is force.

The force of friction is the force that opposes the motion of an object when it is in contact with a surface. The weight of an object is the force exerted on it due to gravity and is calculated as the mass of the object multiplied by the acceleration due to gravity.

μ = F(friction) / N

μ = F(friction) / (m × g)

Therefore, the coefficient of friction is the ratio between the force of friction and the weight of the object. Hence, the correct answer is force.

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The answer is 0.2 Hz. Hope this helps you :)

the answer is 0.2 Hz

Answer:

Zooflagellates belong to the phylum Protista.

Answer:

C) Venus is closer to the Sun than Saturn is.

Explanation:

This is the right answer.

Answer:

A

Explanation:

In Column A, the pattern is 1², 2², 3², etc.  So x(t) = t², which is quadratic.

In Column B, the pattern is 2*1, 2*2, 2*3, etc.  So x(t) = 2t, which is linear.

In Column C, the pattern is 9*1, 9*2, 9*3, etc.  So x(t) = 9t, which is linear.

In Column D, the pattern is 1/1, 1/2, 1/3, etc.  So x(t) = 1/t, which is reciprocal.

In Column E, the pattern is 1/1², 1/2², 1/3², etc.  So x(t) = 1/t², which is reciprocal.

Answer: true

Explanation:

It helping it rotate

Answer:

6.8 s

Explanation:

Let's say the west end of the field is position 0 m and the east end of the field is position 250 m.

The position of kitten A is:

x = 0 + 25 t

And the position of kitten B is:

x = 250 - 12 t

The kittens collide when they have the same position:

25 t = 250 - 12 t

37 t = 250

t ≈ 6.8 s

Answer:

diatomic is the answer

Each element has 2 subscripts because they are a diatomic molecule.

Explanation:

Given Equation: [tex]2 H_{2}+O_{2} \rightarrow 2 H_{2} O[/tex]  

The meaning of ‘di’ in Greek is two. The diatomic molecules consist of only two atoms. The atmosphere of Earth mostly consists of diatomic molecules. The representation of subscript 2 of hydrogen and oxygen in the equation states that there are 2 hydrogen atoms and 2 oxygen atoms are present in the equation.

Answer:

With regard to memory, the process of retaining information over time is known as storage.

It's known as "long-term memory".

Mechanical advantage:  It is ratio of output force and input force.  

Efficiency: It is ratio of output work and input work expressed as a percentage.

Answer: Option A and D

Explanation:

A mechanical advantage is defined as the ratio of output force to the input force. No units are there for the mechanical advantage. Based on the Law of conversation of energy, the energy cannot be multiplied. Efficiency is being defined as the effect of the device on the output work. It is represented as a percent.

In physics, mechanical advantage is the ratio of output force to input force (option A) and efficiency is the ratio of output work to input work, expressed as a percentage (option D). Options B and C are incorrect.

The correct definitions for the terms discussed are as follows:

Statements B and C are incorrect. For mechanical advantage, greater output force than the input is desired, so the ratio is output/input, not input/output. Similarly for efficiency, we're interested in how much of the input work is usefully converted, so it's output/input, not vice versa.

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The convex mirror form an image by bouncing the light away from a focal point.

Answer: Option D

Explanation:

A diverging mirror is a reflecting surface which is a spherical one. The bulging side of the convex mirror will face towards the light source. It is a diverging mirror in which rays diverge upon after reflection. These are often used in the mirrors that are in the automobiles.  

The image that is formed by the convex mirror cannot be displayed on the screen. Hence, they are called as Virtual image. The resulting image by the convex mirror is upright, virtual and size diminished.  

A convex mirror forms an image by it bends the light away from a focal point. Therefore option B is correct.

A convex mirror is a curved mirror with a reflective surface bulging outward. When light rays hit a convex mirror, they are reflected and diverge, spreading out in different directions.

This divergence of light rays causes the image formed by a convex mirror to appear smaller and virtual (not formed by actual light rays converging at a specific point).

Thus, a convex mirror forms an image by bending the light away from a focal point. The curvature of the mirror causes light rays to diverge and spread out, resulting in the formation of a smaller, virtual image located behind the mirror.

Therefore option B is correct.

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Answer:

Kilowatt per hour

Explanation:

The energy is equal to the power by time.

[tex]E=\frac{P}{t}[/tex]