A lightbulb has a power of 100 W and is used for 4 hours. A microwave has a power of 1200 W and is used for 5 minutes. How much energy is used by the lightbulb? How much energy is used by the microwave? The lightbulb has an efficiency of 1.8%. How much heat energy does the lightbulb produce in 4 hours?

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:

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:

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

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

Answer:

Explanation:

Stars are massive objects that have a large gravitational field, which drives the star to contract on itself, which is why fusion occurs: in the center of the star the nuclei of atoms are already so close due to gravity and high temperatures that bind. This is what is called nuclear fusion and is the energy source of a star.

On the other hand yes, the main elements of a star are hydrogen and helium (two hydrogen nuclei fuse to make helium), this makes the star mainly a huge ball of gas so there is no solid surface where you can stand on.

And about water on a star, that is not possible. Temperatures on stars are very vey high that watter could not exist in a liquid form on them.

Stars produce energy through nuclear fusion.

Stars are massive objects composed of gas.

Stars are made primarily of hydrogen as well as helium.

Therefore,  statements that  describe properties of stars here Stars produce energy through nuclear fusion is that Stars are been regarded as  massive objects  which is encompassed  gas.

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Answer: Electrostatics is a branch of physics that studies electric charges at rest.

Answer:

the study of stationary electric charges or fields as opposed to electric currents.

Explanation:

Answer:

D) Touch the electroscope with any charged object.

Explanation:

D) Touch the electroscope with any charged object.

The electroscope functions on the presence of charge therefore to repel the two leaves away any charged object will be helpful.

Answer: Option D

Explanation:

The electroscope is a device which functions to detect the charge on the given object. When the two leaves in the electroscope are normally placed, shows no charge is present.

To repel away the leaves, presence of charge is important and therefore when a charged body touches the electroscope, by the induction of opposite charge develops in the electroscope by which the leaves gets similar charges and hence repels away.

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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Total distance traveled = 74 + 83 = 157 km.

Total time traveled = 1 + 5 = 6 hours.

Average speed = total distance / total time

Average speed = 157 km / 6 hours = 26.1666 km per hour.

Round the answer as needed.

Answer:

Marble with higher speed.

Explanation:

When a marble is thrown with low speed, then it covers less horizontal distance but the marble with higher speed covers more horizontal distance though they both travells through same height from table( i.e. vertical distance).

Since both horizontal and vertical distances are responsible for projectile motion, marble with higher speed describes the motion of projectile more effectively.

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:

Inside the strong metal box, there is a microwave generator called a magnetron. When you start cooking, the magnetron takes electricity from the power outlet and converts it into high-powered, 12cm (4.7 inch) radio waves. Thus the microwaves pass their energy onto the molecules in the food, rapidly heating it up.May 3, 2018

A microwave oven heats food by producing microwaves that exert force on polar molecules such as water, causing them to rotate rapidly. This rapid rotation increases their thermal motion, producing heat. The heat then spreads to other components of the food, successfully heating the food overall.

The electrical field inside a microwave oven plays a fundamental role in heating food. This process works by producing microwaves which are electromagnetic radiation in the radio portion of the spectrum. Microwaves in a microwave oven usually operate at a frequency of 2.45 GHz.

Water molecules and some other constituents in food are known as polar molecules because they have a slight negative charge at one end and a slight positive charge at the other. These microwaves primarily interact with water molecules in the food. The oscillating electrical field of the microwaves exerts a force or torque that aligns these molecules first in one direction and then in the other, making them rotate rapidly.

This rapid rotation pumps energy into the thermal motion of the water molecules, which results in increased temperature or heat. This process is known as dielectric heating. The heat then spreads to other components of the food, heating the food overall. Therefore, the food becomes hot quickly.

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In a right triangle, the "Sin" of an angle is the ratio of (the leg opposite the angle) to (the hypotenuse of the triangle).

If (sin of the angle) is 5/6, then the angle is in a right triangle where the leg opposite the angle is 5 and the hypotenuse is 6.

The other leg ... the one adjacent to that angle ... is √(6² - 5²).  

That's √11 .

-- The (cosine of the angle) is

(leg adjacent to the angle) divided by (hypotenuse of the triangle).

That's  √11/6 .

-- The (tangent of the angle) is

(leg opposite the angle) divided by (leg adjacent to the angle) .

That's  5/√11 .

Final answer:

To find cos θ and tan θ, use the Pythagorean identity. For cos θ, calculate √(11/36) and take the positive or negative root based on the quadrant. Compute tan θ by dividing sin θ by cos θ to get 5√11/11.

Explanation:

Given that sin θ equals 5/6, to find the values of cos θ and tan θ, one must remember the Pythagorean identity, which states that sin²(θ) + cos²(θ) = 1. Since we are given sin θ, we can rearrange the identity to solve for cos θ:

cos^2(θ) = 1 - sin²(θ)

cos^2(θ) = 1 - (5/6)²

cos^2(θ) = 1 - 25/36

cos^2(θ) = 11/36

cos θ = ±√(11/36)

cos θ = ±√11/6

To determine the sign of cos θ, we need to know the quadrant in which the angle θ lies. Since sin θ is positive in the question, and assuming the angle is in the first or second quadrant where sin is positive, we choose the positive root if θ is in the first quadrant and the negative root if θ is in the second quadrant. Lastly, tan θ = sin θ / cos θ.

tan θ can then be calculated using the ratio:

tan θ = (5/6) / (√11/6)

tan θ = 5/√11

We can rationalize the denominator to avoid a radical in the denominator:

tan θ = (5/√11) * (√11/√11)

tan θ = 5√11/11

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:

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 :)

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

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.

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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Answer:

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

Explanation:

This is the right answer.

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:

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:

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.

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 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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Answer: First, question 1 is radiant energy.

Question 2 is nuclear energy

Question 3 is thermal energy

Question 4 is potential energy

Explanation Radiation ( or radiant energy) is high-energy electromagnetic waves. Nuclear energy such as nuclear fusion or fission can change the structure of a nucleus therefore lowering the atomic mass. When molecules vibrate, they produce a lot of energy through friction. That energy is converted into heat. An object that is not in motion but it's position can be altered to be in motion contains potential energy. Once the object gets moving, potential energy is converted into kinetic energy.

Radiant energy matches energy from electromagnetic waves, nuclear energy matches energy caused by changes in the structure of a nucleus, thermal energy matches energy resulting from movement and vibration of molecules, and potential energy matches energy an object has because of its position.

The forms of energy include thermal energy, radiant energy, electrical energy, nuclear energy, and chemical energy.

Energy from electromagnetic waves is referred to as radiant energy. For example, light, microwaves, and radio waves carry radiant energy.

Energy caused by changes in the structure of a nucleus is known as nuclear energy.

Energy resulting from movement and vibration of molecules is called thermal energy. When objects absorb radiant energy like sunlight or microwaves, it is converted into thermal energy.

The energy an object has because of its position is called potential energy. This includes energy stored in the chemical bonds of compounds, which is called chemical energy.

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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:

C 35 km , is the answer

Explanation:

d=55 - 20 = 35

Answer:64l.biggs on ig

Explanation:

Answer: true

Explanation:

It helping it rotate

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: 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

Answer:

the average kinetic energy of water particles - C.