does anyone know the answer to this ?????

Answer:

44J

Explanation:

Given parameters:

Mass of rock  = 0.22kg

Initial velocity  = 20m/s

Distance moved  = 10m

Unknown:

Initial kinetic energy of the rock  = ?

Solution:

To solve this problem, we need to understand that kinetic energy is the energy due to the motion of a body.

It is mathematically expressed as;

     Kinetic energy  = \(\frac{1}{2}\) m v²

m is the mass

v is the velocity

   Kinetic energy  =  \(\frac{1}{2}\) x 0.22 x 20²   = 44J

The polarization axes of glasses for 3-d viewing are in vertical and horizontal.

vertical and horizontal. The 3-d glasses have two lenses. Each lens is polarized in a different way. The lenses are aligned to the image on the screen and each lens allows only one image to enter the eye. This creates an illusion of depth or 3-Dimensional. The light waves that make up an image are polarized. In 3-D glasses, each lens has a different polarization. The lenses allow only the image intended for that eye to be seen. Hence, the brain can integrate the two images to form a single 3-D image.

3-D glasses create an illusion of depth by creating two different images. Each lens of the glasses is polarized in a different way, either vertically or horizontally. One of the lenses will allow the vertical polarization to be seen by one eye and the other lens will allow only horizontal polarization to be seen by the other eye. The two different images are sent to the brain, and it creates an illusion of depth. The polarization of the lenses blocks out the light from the opposite polarization. The images on the screen are transmitted through two different projectors, which are polarized at different angles. The images are projected onto the screen, and the polarization of the lenses filters the images.

3-D glasses work by polarizing the lenses in different ways to allow each eye to see a different image, which creates an illusion of depth. The polarization axes of glasses for 3-d viewing are vertical and horizontal.

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Answer:

Gravitone

Explanation:

In theories of quantum gravity, the graviton is the hypothetical quantum of gravity, an elementary particle that mediates the force of gravity. There is no complete quantum field theory of gravitons due to an outstanding mathematical problem with renormalization in general relativity.

Answer:

To find the average power of the engine during the acceleration, we can use the formula:

Power = Work / Time

The work done on the car is equal to the change in kinetic energy. The change in kinetic energy can be calculated using the formula:

ΔKE = (1/2) * m * (v_f^2 - v_i^2)

where:

m = mass of the car = 2500 kg

v_i = initial velocity = 0 m/s (since the car starts from rest)

v_f = final velocity = 10 m/s

ΔKE = (1/2) * 2500 kg * (10 m/s)^2

ΔKE = 125,000 J

Now, we can substitute the values into the power formula:

Power = ΔKE / Time = 125,000 J / 5.0 s

Power = 25,000 Watts

The maximum potential difference between the disks is 6.25 V when they are separated by a distance of 0.010 m and connected to a 12-V battery.

When two disks of radius 0.10 m are separated by a distance of 0.010 m and are connected to a 12-V battery, the maximum possible voltage between the disks is given by Vmax = (Qmax / (2 * ε0 * A)) * d where Vmax is the maximum possible voltage between the disks

Qmax is the maximum possible charge on the disksε0 is the permittivity of free space

A is the area of the disks d is the distance between the disks.

Substituting the given values, we have

\(A = \pi$ * r^{2} = \pi$ * 0.10^{2} = 0.0314 m^{2} \epsilon0 = 8.85 \times 10^{-12} F/m\) and d = 0.010 m

Thus, we get, \(Qmax = CV = (A * \epsilon0 * Vmax) / d= (0.0314 * 8.85 \times 10^{-12} * 12) / 0.010= 3.51 \times 10^{-12} C\)

The maximum potential difference between the disks is given by,

\(Vmax = (Qmax / (2 * \epsilon0 * A)) * d= (3.51 \times 10^{-12} / (2 * 8.85 \times 10^{-12} * 0.0314)) * 0.010\approx 6.25 V\)

Therefore, the maximum potential difference between the disks is 6.25 V when they are separated by a distance of 0.010 m and connected to a 12-V battery.

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The flaw in the experiment on water recycling is that the student did not see water dripping off the glass plate as expected. To correct this flaw, the student should use a cold glass plate instead of a hot glass plate.

The correct option to the given question is option 4.

When the student holds the hot glass plate above the beaker, the water vapor in the atmosphere will come into contact with the cold surface of the plate and condense, forming water droplets. However, if the glass plate is already hot, it will not be able to cool down the water vapor quickly enough for condensation to occur.

By using a cold glass plate, the temperature difference between the plate and the water vapor will be greater, allowing for faster condensation. This will result in water droplets forming on the glass plate and dripping off, demonstrating the process of water recycling through the atmosphere.

Therefore, the correct method to correct the flaw in this experiment is to use a cold glass plate instead of a hot glass plate. This will enable the student to observe water droplets on the glass plate as expected.

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The de Broglie wavelength of the electron is 2.212 x 10-11 m.

The de Broglie wavelength is a concept in quantum mechanics which states that all matter has a wave-like nature, and can thus be described as a wave.

(a) The de Broglie wavelength (λ) of a particle is given by the equation: λ = h/p, where h is Planck's constant (6.626 x 10-34 J.s) and p is the momentum of the particle.
The momentum of an electron with a 1000-V potential drop is given by the equation p = eV/c,
where e is the electron charge (1.602 x 10-19 C) and c is the speed of light (2.998 x 108 m/s).
Therefore, the de Broglie wavelength of the electron is:
λ = h/(eV/c) = (6.626 x 10-34 J.s) / (1.602 x 10-19 C x 1000 V/2.998 x 108 m/s) = 2.212 x 10-11 m.

(b) X-rays are produced when high-energy electrons strike a solid.
The wavelength of the x-ray is inversely proportional to the energy of the electron.
The energy of the electron is equal to the potential drop, i.e. 1000 eV. Therefore,
the wavelength of the x-ray produced is: λ = hc/eV = (6.626 x 10-34 J.s x 2.998 x 108 m/s)/(1.602 x 10-19 C x 1000 eV) = 1.246 x 10-10 m.

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Answer:

sequence

Explanation:

sequences are the way in which things are ordered, for example: 1, 2, 3, 4 is a sequence:)

The fitness equipment would you use if you were doing the Twist and Shout exercise is a medicine ball. The correct option is B.

A smaller segment of the larger sporting goods industry is fitness equipment. Treadmills, free weights, weight machines, and elliptical trainers are examples of fitness equipment. A treadmill is a machine with a moving belt on which a person can walk or run while standing still.

A medicinal ball enables you to conduct dynamic movements while adding weight and resistance.

Therefore, the correct option is B. Medicine ball.

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Answer:

is

Explanation:

e

Option A.  N-type semiconductor uses phosphorus so that electrical conduction is due to the movement of electrons.

An N-type semiconductor is an impurity mixed semiconductor material used in electronics.

The N-type semiconductor uses pentavalent impure atoms like phosphorus and arsenic.

The conduction through an N-type semiconductor is majorly caused by the electrons.

Thus, n-type semiconductor uses phosphorus so that electrical conduction is due to the movement of electrons.

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Answer:

Explanation:it is too easy

Answer:

1. a = 1m/s

b = 3m/s

2. b is faster by 2m/s

Explanation:

v (speed) = d/t

va (speed for cyclist a) = 5/5

1m/s

vb = 9/3

3m/s

comparison = 3 - 1 = 2

difference = 2m/s

cyclist b is going faster because they cover more distance in a second

The results of parts (a) and (b) show that the Clausius statement of the second law of thermodynamics is violated because the efficiencies of the Carnot engine and the hypothetical engine S are greater than the efficiency of a reversible Carnot engine operating between the same temperature reservoirs.

The Clausius statement of the second law of thermodynamics states that it is impossible for a heat engine to transfer heat from a colder reservoir to a hotter reservoir without any external work input. This implies that the maximum possible efficiency for a heat engine operating between two temperatures is given by the Carnot efficiency, which is based on the temperatures of the hot and cold reservoirs.

In part (a) of the question, the efficiency of the Carnot engine is given as 60.0%. This means that the Carnot engine is able to convert 60% of the heat energy it absorbs from the hot reservoir into work, while the remaining 40% is rejected as heat into the cold reservoir. This efficiency is determined solely by the temperature difference between the two reservoirs.

In part (b), it is stated that there is a hypothetical engine S with an efficiency of 70.0%. This implies that engine S is able to convert 70% of the heat energy it absorbs from the hot reservoir into work, which is higher than the efficiency of the Carnot engine. This violates the Clausius statement of the second law because engine S is able to operate with a higher efficiency than the maximum efficiency allowed by the Carnot efficiency.

Therefore, the results of parts (a) and (b) demonstrate a violation of the Clausius statement of the second law of thermodynamics, indicating that there is an inconsistency or an impossibility in the behavior of the hypothetical engine S. This highlights the importance of the Carnot efficiency as an upper limit for the efficiency of heat engines and the validity of the second law of thermodynamics.

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Compact fluorescent light usually has a B. Longer life compared to an incandescent bulb producing the same number of lumens.

CFLs are designed to be more energy-efficient than incandescent bulbs. They use less energy to produce the same amount of light, which makes them more efficient. This efficiency leads to a longer lifespan for the CFL compared to incandescent bulbs. In general, a CFL can last up to 10 times longer than an incandescent bulb.

To summarize:
- A compact fluorescent light (CFL) has a longer life compared to an incandescent bulb producing the same number of lumens.
- This is due to the higher energy efficiency of CFLs, which allows them to use less energy and have a longer lifespan.

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Explanation:

 A burning candle emits radiation in the form of heat and light. The Sun emits radiation in the form of light, heat, and particles.

Answer: The energy from the sun is one great example of radiation. The sun emits light in a broad range of wavelengths which all contain energy. These waves are also discussed in the climate section for energy balance. The waves are emitted from the sun and travel through space and hit the earth and other planets.

EXTRA EXAMPLES: heat from a stove burner.

visible light from a candle.

x-rays from an x-ray machine.

alpha particles emitted from the radioactive decay of uranium.

sound waves from your stereo.

microwaves from a microwave oven.

electromagnetic radiation from your cell phone.

Answer:

Explanation:

this is my android auto

The time taken by the ball to reach the surface of the moon that drops from a height of 1.5 m from the moon is 1.36s.

Given that the acceleration of gravity on the surface of the moon is, \(a=g=1.62 ms^{-2}\). The distance of the ball from the surface is the height of the ball from the surface. So, \(h=d=1.5 m\).

Since the ball is dropped under gravity or free-fall motion from rest, then the initial velocity is zero (i.e.) \(v=0ms^{-1}\). Let t be the time taken by the ball to reach the surface of the moon.

By the equation of motion, the equation is given by \(h=v_{0} t+\frac{1}{2}gt^{2}\), where g is the gravity, t is the time taken by an object, h is the distance of the object, and \(v_{0}\) is the initial velocity of an object from the rest.

Substitute the values of h, g, and \(v_{0}\) in the above equation, and we get

\(1.5=(0)t+\frac{1}{2}(1.62)t^{2}\)

\(1.5=0.81t^{2}\)

\(t^{2} =\frac{1.5}{0.81}\)

\(t^2=1.852\)

\(t=\pm1.36s\)

The time taken cannot be negative.

Therefore, The time taken by the ball to reach the surface of the moon is 1.36s.

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Answer:

I mean you could just look it up... but here the answer for you ,so you know it's right...

Explanation:

:)

Given:

A ball bouncing eventually comes to stop.

To find:

What kind of a system is this?

Explanation:

An open system is a system where the free exchange of matter and energy with the surroundings takes place.

A closed system is where only the energy of the system is shared with the surrounding. In these kinds of systems, the exchange of matter does not take place.

An isolated system is where neither matter nor energy is exchanged between the system and the surrounding.

When a ball is bouncing, it gradually loses its kinetic energy to the surroundings and eventually comes to stop. But the mass of the ball remains the same. Thus this is a closed system.

Final answer:

The given system is a closed system.

Therefore the correct answer is option B.

When a problem is asking for the pH of a concentration at a certain temperature if given kb, it means that the problem is asking for the acidity or basicity of a solution at a specific temperature that is determined by the given value of kb (base dissociation constant).

pH is a measure of the hydrogen ion concentration in a solution that determines its acidity or basicity. pH values range from 0 to 14, with 7 being neutral, values less than 7 being acidic, and values greater than 7 being basic or alkaline. kb is the dissociation constant of a base, which is defined as the concentration of hydroxide ions (OH-) when the base is dissolved in water. It is related to the pH of the solution by the formula:

pOH = -log(kb) pH = 14 - pOH

At a given temperature, the dissociation of a base affects the pH of the solution. Therefore, if the value of kb is given, it can be used to determine the concentration of hydroxide ions and pH of the solution. The exact calculation may vary depending on the specific problem, but it generally involves the use of the given value of kb, the molar concentration of the base, and the equilibrium constant expression of the reaction.

Therefore, when a problem is asking for the pH of a concentration at a certain temperature, given Kb, it means you need to calculate the pH of the solution based on the provided base dissociation constant (Kb) and temperature.

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Answer:

11772 N

Explanation:

\(\boxed{w = mg}\)

w= weight

m= mass

g= acceleration due to gravity

The acceleration due to gravity on earth is 9.81m/s².

Substitute m= 1200 and g= 9.81 into the formula:

w= 1200(9.81)

w= 11772 N

Answer:

Michelson reasoned that, if the speed of light were constant with respect to the proposed ether through which Earth was moving, that motion could be detected by comparing the speed of light in the direction of Earth's motion and the speed of light at right angles to Earth's motion.

a) The shoppers who walked from the car to the door in 20 minutes walked for 1200 seconds.

b) The shoppers' walking speed in meters per second is 0.67m/s.

A) In the question, we are already given how long it took for the shoppers to walk from their car to the entrance of the shopping mall, although it's in minutes. We are told that it took them 20 minutes to walk from their car to the entrance. In order to know how long they were walking in seconds, we would have to multiply by 60. This is because there are 60 seconds in one minute. Hence, to find the number of seconds in 20 minutes, we multiply 20 minutes by 60 seconds, thus;

                     20 minutes × 60 seconds = 1200 seconds.

B) Now that we know how long the shoppers were walking in seconds, we can use it to get their walking speed. To find the speed of any moving object, we divide the distance the object travelled by the time taken for the object to cross that distance in seconds. In the question, we are told that the shoppers parked their car 800 meters away from the entrance. This means that the distance they walked to get to the entrance is also 800 meters. Thus to find their walking speed;

                               Speed = distance ÷ time

                               Speed = 800 meters ÷ 1200 seconds

                              Speed = 0.67 m/s.

Therefore, the shoppers walked for 1200 seconds at 0.67m/s.

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When Clara throws a ball straight up with an initial velocity of 4 m/s, the velocity of the ball at the highest point is 0 m/s.

As the ball moves upward against the force of gravity, its velocity gradually decreases due to the deceleration caused by gravity. At the highest point of its trajectory, the ball momentarily comes to a stop before changing direction and starting to descend. The velocity at the highest point is zero because the ball reaches its maximum height and momentarily experiences zero vertical velocity.

This occurs when the upward velocity due to Clara's throw is fully counteracted by the downward acceleration due to gravity, resulting in zero net velocity at the highest point.

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Answer:

The answer is b.Protons